KasperCalc: MIL-HDBK-5 3.6 6000 Series Wrought Alloys

Aluminum Alloy Index

•Aluminum Alloy Index 3.1General 3.22000 Series Wrought Alloys 3.2.12014 Alloy 3.2.22017 Alloy 3.2.32024 Alloy 3.2.42025 Alloy 3.2.52026 Alloy 3.2.62090 Alloy 3.2.72124 Alloy 3.2.82219 Alloy 3.2.92297 Alloy 3.2.102424 Alloy 3.2.112519 Alloy 3.2.122524 Alloy 3.2.132618 Alloy 3.55000 Series Wrought Alloys 3.5.15052 Alloy 3.5.25083 Alloy 3.5.35086 Alloy 3.5.45454 Alloy 3.5.55456 Alloy 3.66000 Series Wrought Alloys 3.6.16013 Alloy 3.6.26061 Alloy 3.6.36151 Alloy 3.77000 Series Wrought Alloys 3.7.17010 Alloy 3.7.27040 Alloy 3.7.37049/7149 Alloy 3.7.47050 Alloy 3.7.57055 Alloy 3.7.67075 Alloy 3.7.77150 Alloy 3.7.87175 Alloy 3.7.97249 Alloy 3.7.107475 Alloy 3.8200.0 Series Cast Alloys 3.8.1A201.0 Alloy 3.9300.0 Series Cast Alloys 3.9.1354.0 Alloy 3.9.2355.0 Alloy 3.9.3C355.0 Alloy 3.9.4356.0 Alloy 3.9.5A356.0 Alloy 3.9.6A357.0 Alloy 3.9.7D357.0 Alloy 3.9.8359.0 Alloy 3.10Element Properties

Chapter 3.6 Contents

3.66000 Series Wrought Alloys 3.6.16013 Alloy 3.6.1.0Comments and Properties 3.6.1.1T6 Temper 3.6.26061 Alloy 3.6.2.0Comments and Properties 3.6.2.1T4 Tempers 3.6.2.2T6 Tempers 3.6.36151 Alloy 3.6.3.0Comments and Properties 3.6.3.1T6 Temper

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Chapter 1 — General Chapter 2 — Steel Chapter 3 — Aluminum 3.1 — General 3.2 — 2000 Series Wrought Alloys 3.5 — 5000 Series Wrought Alloys 3.6 — 6000 Series Wrought Alloys 3.7 — 7000 Series Wrought Alloys 3.8 — 200.0 Series Cast Alloys 3.9 — 300.0 Series Cast Alloys 3.10 — Element Properties Chapter 4 — Magnesium

Disclaimer

For reference use only. The formulas, graphs, and values herein are provided in good faith for general engineering guidance. Please verify all data against MIL-HDBK-5J or the applicable superseding document (MMPDS).

Table of Tables

Table of Figures

Table of Figures (cont.)

Fig 3.6.2.2.6(e)Typical tensile stress-strain curves for 6061-T6 aluminum alloy sheet at 500°F. Thickness = 0.125 in. Fig 3.6.2.2.6(f)Typical compressive stress-strain and compressive tangent-modulus curves for 6061-T6 aluminum alloy sheet at room temperature. Thickness = 0.249 in. Fig 3.6.2.2.6(g)Typical tensile and compressive stress-strain and compressive tangent-modulus curves for 6061-T6 aluminum alloy sheet at room temperature. Fig 3.6.2.2.6(h)Typical tensile stress-strain curves for 6061-T6 aluminum alloy extrusion at room temperature. All thicknesses. Fig 3.6.2.2.6(i)Typical compressive stress-strain and compressive tangent-modulus curves for 6061-T6 aluminum alloy extrusion at room temperature. All thicknesses. Fig 3.6.2.2.6(j)Typical tensile and compressive stress-strain and compressive tangent-modulus curves for 6061-T651X aluminum alloy extrusion at room temperature. Thickness = 0.499 in. Fig 3.6.2.2.6(k)Typical tensile and compressive stress-strain and compressive tangent-modulus curves for 6061-T651X aluminum alloy extrusion at room temperature. Thickness = 3.000 in. Fig 3.6.2.2.6(l)Typical tensile stress-strain curve (full range) for 6061-T6 aluminum alloy sheet at room temperature. Fig 3.6.2.2.6(m)Typical tensile stress-strain curves (full range) for 6061-T62 aluminum alloy extrusion at room temperature. All thicknesses. Fig 3.6.2.2.6(n)Typical tensile stress-strain curves (full range) for 6061-T651X aluminum alloy extrusion at room temperature. Thickness ≤ 0.499 in. Fig 3.6.2.2.6(o)Typical tensile stress-strain curves (full range) for 6061-T651X aluminum alloy extrusion at room temperature. Thickness = 3.000 in. Fig 3.6.2.2.8Best-fit S/N curves for unnotched 6061-T6 aluminum alloy, various wrought products, longitudinal direction. Fig 3.6.3.0Effect of temperature on the thermal expansion of 6151 aluminum alloy.

3.66000 Series Wrought Alloys

Alloys of the 6000 series contain magnesium and silicon as their principal alloying elements.

3.6.16013 Alloy

3.6.1.0Comments and Properties

6013 is a Mg-Si-Cu-Mn alloy which is weldable. This alloy has 25 percent higher strength in the T6 temper than 6061-T6. It has improved toughness, fatigue strength, and stretch forming characteristics compared to 6061 with equivalent stress corrosion characteristics. Refer to Section 3.1.3.4 for comments regarding weldability of the alloy.

Material specifications for 6013 are shown in Table 3.6.1.0(a). Room-temperature mechanical and physical properties are presented in Table 3.6.1.0(b).

Table 3.6.1.0(a). Material Specifications for 6013 Aluminum Alloy
Specification	Form
AMS 4347	Sheet (T4)
AMS 4216	Sheet (T6)

The temper index is as follows:

3.6.1.1 — T6

Table 3.6.1.0(b). Design Mechanical and Physical Properties of 6013 Aluminum Alloy Sheet
Specification	AMS 4216 and AMS 4347
Form	Sheet
Temper	T6
Thickness, in.	0.010-0.062	0.063-0.125	0.126-0.249
Basis	S	S	S
Mechanical Properties:
F_tu, ksi:
L	52	52	52
LT	52	52	52
F_ty, ksi:
L	47	47	48
LT	46	46	46
F_cy, ksi:
L	48	48	48
LT	48	48	49
F_su, ksi	32	32	32
F_bru^a, ksi:
(e/D = 1.5)	85	85	85
(e/D = 2.0)	111	111	111
F_bry^a, ksi:
(e/D = 1.5)	66	69	71
(e/D = 2.0)	76	80	82
e, percent:
LT	8	8	8
E, 10³ ksi	9.9
E_c, 10³ ksi	10.1
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, K, and α	···
^a Bearing values are “dry pin” values per Section 1.4.7.1.

3.6.1.1T6 Temper

Stress-strain and tangent-modulus curves are presented in Figures 3.6.1.1.6(a) and (b).

Figure 3.6.1.1.6(a). Typical tensile stress-strain curves for 6013-T6 aluminum alloy sheet at room temperature. Thickness = 0.010–0.249 in.

Figure 3.6.1.1.6(b). Typical compressive stress-strain and compressive tangent-modulus curves for 6013-T6 aluminum alloy sheet at room temperature. Thickness = 0.010–0.249 in.

3.6.26061 Alloy

3.6.2.0Comments and Properties

6061 has been used in a wide range of applications, including cryogenic applications requiring high toughness. Refer to Section 3.1.3.4 for comments regarding the weldability of the alloy.

The properties of extrusions should be based upon the thickness at the time of quenching prior to machining. Selection of the mechanical properties based upon its final machined thickness may be unconservative; therefore, the thickness at the time of quenching to achieve properties is an important factor in the selection of the proper thickness column. For extrusions having sections with various thicknesses, consideration should be given to the properties as a function of thickness.

Material specifications for 6061 are presented in Table 3.6.2.0(a). Room-temperature mechanical and physical properties are shown in Tables 3.6.2.0(b) through (g). The effect of temperature on the physical properties is shown in Figure 3.6.2.0.

Table 3.6.2.0(a). Material Specifications for 6061 Aluminum Alloy
Specification	Form
AMS 4025	Sheet and plate
AMS 4026	Sheet and plate
AMS 4027	Sheet and plate
AMS-QQ-A-250/11	Sheet and plate
AMS 4115	Bar and rod, rolled or cold-finished
AMS 4116	Bar and rod, cold-finished
AMS 4117	Bar and rod, rolled or cold-finished
AMS-QQ-A-225/8	Rolled bar, rod, and shapes
AMS 4150	Extruded rod, bar, and shapes
AMS 4160	Extrusion
AMS 4161	Extrusion
AMS 4172	Extrusion
AMS 4173	Extruded rod, bar, and shapes
AMS-QQ-A-200/8	Extruded rod, bar, shapes, and tubing
AMS-A-22771	Forging
AMS 4080	Tubing, seamless, drawn
AMS 4082	Tubing, seamless, drawn
AMS-WW-T-700/6	Seamless drawn tubing
AMS 4127	Forging
AMS 4248	Hand forging
AMS-QQ-A-367	Forging

The temper index for 6061 is as follows:

3.6.2.1 — T4, T42, T451, T4510, and T4511
3.6.2.2 — T6, T62, T651, T652, T6510, and T6511

Table 3.6.2.0(b₁). Design Mechanical and Physical Properties of 6061 Aluminum Alloy Sheet
Specification	AMS 4026 and AMS-QQ-A-250/11		AMS-QQ-A-250/11	AMS 4025, AMS 4027 and AMS-QQ-A-250/11
Form	Sheet
Temper	T4		T42^a	T6 and T62^b
Thickness, in.	0.010-0.249		0.010-0.249	0.010-0.249
Basis	A	B	S	A	B
Mechanical Properties:
F_tu, ksi:
L	···	···	···	42	43
LT	30	32	30	42	43
F_ty, ksi:
L	···	···	···	36	38
LT	16	18	14	35	37
F_cy, ksi:
L	···	···	···	35	37
LT	16	18	···	36	38
F_su, ksi	20	21	···	27	28
F_bru, ksi:
(e/D = 1.5)	48	51	···	67	69
(e/D = 2.0)	63	67	···	88	90
F_bry, ksi:
(e/D = 1.5)	22	25	···	50	53
(e/D = 2.0)	26	29	···	58	61
e, percent (S-basis):
LT	^c	···	^c	^c	···
E, 10³ ksi	9.9
E_c, 10³ ksi	10.1
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, K, and α	See Figure 3.6.2.0
^a Design allowables were based upon data obtained from testing samples of material, supplied in the O or F temper, which were heat treated to demonstrate response to heat treatment by suppliers. Properties obtained by the user may be lower than those listed if the material has been formed or otherwise cold or hot worked, particularly in the annealed temper, prior to solution heat treatment.
^b Design allowables were based upon data obtained from testing T6 sheet and from testing samples of sheet, supplied in the O or F temper, which were heat treated to T62 temper to demonstrate response to heat treatment by suppliers. Properties obtained may be lower than those listed if the material has been formed or otherwise cold worked, particularly in the annealed temper, prior to solution heat treatment.
^c See Table 3.6.2.0(b₃).

Table 3.6.2.0(b₂). Design Mechanical and Physical Properties of 6061 Aluminum Alloy Plate
Specification	AMS 4026 and AMS-QQ-A-250/11				AMS-QQ-A-250/11		AMS 4025, AMS 4027 and AMS-QQ-A-250/11
Form	Plate
Temper	T451				T42^a		T651 and T62^b
Thickness, in.	0.250-2.000		2.001-3.000		0.250-1.000	1.001-3.000	0.250-2.000		2.001-3.000		3.001-4.000	4.001-6.000^c
Basis	A	B	A	B	S	S	A	B	A	B	S	S
Mechanical Properties:
F_tu, ksi:
L	···	···	···	···	···	···	42	43	···	···	···	···
LT	30	32	30	32	30	30	42	43	42	43	42	40
F_ty, ksi:
L	···	···	···	···	···	···	36	38	···	···	···	···
LT	16	18	16	18	14	14	35	37	35	37	35	35
F_cy, ksi:
L	···	···	···	···	···	···	35	37	···	···	···	···
LT	16	18	···	···	···	···	36	38	···	···	···	···
F_su, ksi	20	21	···	···	···	···	27	28	···	···	···	···
F_bru, ksi:
(e/D = 1.5)	48	52	···	···	···	···	67	69	···	···	···	···
(e/D = 2.0)	63	67	···	···	···	···	88	90	···	···	···	···
F_bry, ksi:
(e/D = 1.5)	22	25	···	···	···	···	50	53	···	···	···	···
(e/D = 2.0)	26	29	···	···	···	···	58	61	···	···	···	···
e, percent:
L	^d	···	16	···	18	16	^d	···	6	···	6	6
E, 10³ ksi	9.9
E_c, 10³ ksi	10.1
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, K, and α	See Figure 3.6.2.0
^a Design allowables were based upon data obtained from testing samples of material, supplied in the O temper, which were heat treated to demonstrate response to heat treatment by suppliers. Properties obtained by the user may be lower than those listed if the material has been formed or otherwise cold or hot worked, particularly in the annealed temper, prior to solution heat treatment.
^b Design allowables were based upon data obtained from testing T651 plate and from testing samples of plate, supplied in the O temper, which were heat treated to demonstrate response to heat treatment by suppliers. Properties obtained may be lower than those listed if the material has been formed or otherwise cold worked, particularly in the annealed temper, prior to solution heat treatment.
^c Properties for this thickness apply only to T651 temper.
^d See Table 3.6.2.0(b₃).

Table 3.6.2.0(b3). Minimum Elongation Values for 6061 Aluminum Alloy Sheet and Plate
Temper and Product	Thickness, in.	Elongation (LT), percent
T4 or T42 sheet	0.010–0.020	14
T4 or T42 sheet	0.021–0.249	16
T451 plate	0.250–1.000	18
T451 plate	1.001–2.000	16
T6 or T62 sheet	0.010–0.020	8
T6 or T62 sheet	0.021–0.249	10
T651 or T62 plate	0.250–0.499	10
T651 or T62 plate	0.500–1.000	9
T651 or T62 plate	1.001–2.000	8

Table 3.6.2.0(c₁). Design Mechanical and Physical Properties of 6061 Aluminum Alloy Tube and Pipe
Specification	AMS-WW-T-700/6	AMS-WW-T-700/6	AMS 4080, AMS 4082, and AMS-WW-T-700/6
Form	Drawn tube
Temper	T4	T42^a	T6^b and T62
Wall Thickness, in.	0.025-0.500	0.025-0.500	0.025-0.500
Basis	S	S	S
Mechanical Properties:
F_tu, ksi:
L	30	30	42
F_ty, ksi:
L	16	14	35
F_cy, ksi:
L	14	···	34
F_su, ksi	20	···	27
F_bru, ksi:
(e/D = 1.5)	48	···	67
(e/D = 2.0)	63	···	88
F_bry, ksi:
(e/D = 1.5)	22	···	49
(e/D = 2.0)	26	···	56
e, percent:
L	^c	^c	^c
E, 10³ ksi	9.9
E_c, 10³ ksi	10.1
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, K, and α	See Figure 3.6.2.0
^a Design allowables were based upon data obtained from testing samples of material, supplied in the O temper, which were heat treated to demonstrate response to heat treatment by suppliers. Properties obtained by the user may be lower than those listed if the material has been formed or otherwise cold or hot worked, particularly in the annealed temper, prior to solution heat treatment.
^b Design allowables were based upon data obtained from testing T6 temper tube and from testing samples of tube, supplied in the O temper, which were heat treated to demonstrate response to heat treatment by suppliers. Properties obtained by the user may be lower than those listed if the material has been formed or otherwise cold worked, particularly in the annealed temper, prior to solution heat treatment.
^c See Table 3.6.2.0(c₂).

Table 3.6.2.0(c2). Minimum Elongation Values for 6061 Aluminum Alloy Tubing
Temper	Wall Thickness, in.	Elongation (L), Full-Section Specimen, percent	Elongation (L), Cut-Out Specimen, percent
T4 or T42	0.025–0.049	16	14
T4 or T42	0.050–0.259	18	16
T4 or T42	0.260–0.500	20	18
T6 or T62	0.025–0.049	10	8
T6 or T62	0.050–0.259	12	10
T6 or T62	0.260–0.500	14	12

Table 3.6.2.0(d). Design Mechanical and Physical Properties of 6061 Aluminum Alloy Rolled, Drawn, or Cold-Finished Bar, Rod, and Shapes
Specification	AMS 4116 & AMS-QQ-A-225/8	AMS 4128 & AMS-QQ-A-225/8	AMS-QQ-A-225/8	AMS 4117 & AMS-QQ-A-225/8	AMS 4128 & AMS-QQ-A-225/8	AMS 4115, AMS 4116, & AMS-QQ-A-225/8
Form	Rolled, drawn, or cold-finished rod and special shapes
Temper	T4	T451	T42^a	T6	T651	T62^a
Cross-Sectional Area, in.²	≤50
Thickness, in.	≤8.000	0.500-8.000	≤8.000	≤8.000	0.500-8.000	≤8.000
Basis	S	S	S	S	S	S
Mechanical Properties:
F_tu, ksi:
L	30	30	30	42	42	42
F_ty, ksi:
L	16	16	14	35	35	35
F_cy, ksi:
L	14	14	···	34	34	···
F_su, ksi	20	20	···	27	27	···
F_bru, ksi:
(e/D = 1.5)	48	48	···	67	67	···
(e/D = 2.0)	63	63	···	88	88	···
F_bry, ksi:
(e/D = 1.5)	22	22	···	49	49	···
(e/D = 2.0)	26	26	···	56	56	···
e, percent:
L	18	18	18	10	10	10
E, 10³ ksi	9.9
E_c, 10³ ksi	10.1
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, K, and α	See Figure 3.6.2.0
^a Design allowables were based upon data obtained from testing samples of material, supplied in the O or F temper, which were heat treated to demonstrate response to heat treatment by suppliers.

Table 3.6.2.0(e). Design Mechanical and Physical Properties of 6061 Aluminum Alloy Die Forging
Specification	AMS 4127, MIL-A-22771, and QQ-A-367
Form	Die forging
Temper	T6 and T652
Thickness, in.	≤4.000^a
Basis	S
Mechanical Properties:
F_tu, ksi:
L	38
T^b	38
F_ty, ksi:
L	35
T^b	35
F_cy, ksi:
L	36
T^b	36
F_su, ksi	25
F_bru, ksi:
(e/D = 1.5)	61
(e/D = 2.0)	76
F_bry, ksi:
(e/D = 1.5)	54
(e/D = 2.0)	61
e, percent:
L	7
T^b	5
E, 10³ ksi	9.9
E_c, 10³ ksi	10.1
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, K, and α	See Figure 3.6.2.0
^a Thickness at the time of heat treatment. When die forgings are machined before heat treatment, the mechanical properties are applicable provided the as-forged thickness is not greater than twice the thickness at the time of heat treatment.
^b T indicates any grain direction not within ±15° of being parallel to the forging flow lines. F_cy(T) values are based upon short transverse (ST) test data.

Table 3.6.2.0(f). Design Mechanical and Physical Properties of 6061 Aluminum Alloy Hand Forging
Specification	AMS 4127, AMS 4248, AMS-A-22771, and AMS-QQ-A-367
Form	Hand forging
Temper	T6^a and T652
Cross-Sectional Area, in.²	≤256
Thickness, in.	≤2.000	2.001-4.000	4.001-8.000
Basis	S	S	S
Mechanical Properties:
F_tu, ksi:
L	38	38	37
LT	38	38	37
ST	···	37	35
F_ty, ksi:
L	35	35	34
LT	35	35	34
ST	···	33	32
F_cy, ksi:
L	36	36	35
LT	36	36	35
ST	···	34	33
F_su, ksi	25	25	24
F_bru, ksi:
(e/D = 1.5)	61	61	59
(e/D = 2.0)	76	76	74
F_bry, ksi:
(e/D = 1.5)	54	54	53
(e/D = 2.0)	61	61	59
e, percent:
L	10	10	8
LT	8	8	6
ST	···	5	4
E, 10³ ksi	9.9
E_c, 10³ ksi	10.1
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, K, and α	See Figure 3.6.2.0
^a When hand forgings are machined before heat treatment, the section thickness at time of heat treatment will determine the minimum mechanical properties as long as the original (as-forged) thickness does not exceed the maximum thickness for the alloy as shown in the table.

Table 3.6.2.0(g). Design Mechanical and Physical Properties of 6061 Aluminum Alloy Extruded Rod, Bar, and Shapes
Specification	AMS 4161, AMS 4172, & AMS-QQ-A-200/8	AMS-QQ-A-200/8	AMS 4160 & AMS-QQ-A-200/8	AMS 4150, AMS 4173 & AMS-QQ-A-200/8		AMS 4150, AMS 4173 & AMS-QQ-A-200/8
Form	Extruded rod, bar, and shapes
Temper	T4, T4510, and T4511	T42^a	T62^a	T6, T6510, and T6511
Cross-Sectional Area, in.²	···	···	···	≤32
Thickness,^b in.	≤3.000	All	All	≤1.000		1.001-6.500
Basis	S	S	S	A	B	A	B
Mechanical Properties:
F_tu, ksi:
L	26	26	38	38	41	38	41
LT	···	···	···	37	40	33	35
F_ty, ksi:
L	16	12	35	35	38	35	38
LT	···	···	···	33	36	28	31
F_cy, ksi:
L	14	···	···	34	37	34	37
LT	···	···	···	35	38	30	33
F_su, ksi	16	···	···	26	28	19	21
F_bru^c, ksi:
(e/D = 1.5)	42	···	···	64	69	52	57
(e/D = 2.0)	55	···	···	82	88	69	74
F_bry^c, ksi:
(e/D = 1.5)	22	···	···	54	58	42	46
(e/D = 2.0)	26	···	···	60	65	50	55
e, percent (S-basis):
L	16	16	10^d	10^d	···	10	···
E, 10³ ksi	9.9
E_c, 10³ ksi	10.1
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, K, and α	See Figure 3.6.2.0
^a Design allowables were based upon data obtained from testing samples of material, supplied in the O to F temper which were heat treated to demonstrate response to heat treatment by suppliers. Properties obtained by the user, however, may be lower than those listed if the material has been formed or otherwise cold or hot worked, particularly in the annealed temper, prior to solution heat treatment.
^b The mechanical properties are to be based upon the thickness at the time of quench.
^c Bearing values are “dry pin” values per Section 1.4.7.1.
^d For thicknesses ≤0.249 inch, e = 8%.

Figure 3.6.2.0. Effect of temperature on the physical properties of 6061 aluminum alloy.

3.6.2.1T4, T42, T451, T4510, and T4511 Tempers

For effect of temperature on modulus values, use Figure 3.6.2.2.4.

3.6.2.2T6, T62, T651, T652, T6510, and T6511 Tempers

Figures 3.6.2.2.1(a) through (d), 3.6.2.2.4, and 3.6.2.2.5(a) and (b) present elevated-temperature curves for various mechanical properties. Figures 3.6.2.2.6(a) through (k) contain tensile and compression stress-strain curves at room temperature and elevated temperatures, and tangent-modulus curves at room temperature for various products and tempers. Figures 3.6.2.2.6(l) through (o) present full-range tensile stress-strain curves at room temperature for various products and tempers. Figure 3.6.2.2.8 contains unnotched fatigue data for various wrought products at room temperature.

Figure 3.6.2.2.1(a). Effect of temperature on the tensile ultimate strength (Ftu) of 6061-T6 aluminum alloy (all products).

Figure 3.6.2.2.1(b). Effect of temperature on the tensile yield strength (Fty) of 6061-T6 aluminum alloy (all products).

Figure 3.6.2.2.1(c). Effect of exposure at elevated temperatures on the room-temperature tensile ultimate strength (Ftu) of 6061-T6 aluminum alloy (all products).

Figure 3.6.2.2.1(d). Effect of exposure at elevated temperatures on the room-temperature tensile yield strength (Fty) of 6061-T6 aluminum alloy (all products).

Figure 3.6.2.2.4. Effect of temperature on the tensile and compressive moduli (E and Ec) of 6061 aluminum alloy.

Figure 3.6.2.2.5(a). Effect of temperature on the elongation of 6061-T6 aluminum alloy (all products).

Figure 3.6.2.2.5(b). Effect of exposure at elevated temperatures on the room-temperature elongation of 6061-T6 aluminum alloy (all products).

Figure 3.6.2.2.6(a). Typical tensile stress-strain curves for 6061-T6 aluminum alloy sheet at room temperature. Thickness = 0.249 in.

Figure 3.6.2.2.6(b). Typical tensile stress-strain curve for 6061-T6 aluminum alloy sheet at 200°F. Thickness = 0.125 in.

Figure 3.6.2.2.6(c). Typical tensile stress-strain curves for 6061-T6 aluminum alloy sheet at 300°F. Thickness = 0.125 in.

Figure 3.6.2.2.6(d). Typical tensile stress-strain curves for 6061-T6 aluminum alloy sheet at 400°F. Thickness = 0.125 in.

Figure 3.6.2.2.6(e). Typical tensile stress-strain curves for 6061-T6 aluminum alloy sheet at 500°F. Thickness = 0.125 in.

Figure 3.6.2.2.6(f). Typical compressive stress-strain and compressive tangent-modulus curves for 6061-T6 aluminum alloy sheet at room temperature. Thickness = 0.249 in.

Figure 3.6.2.2.6(g). Typical tensile and compressive stress-strain and compressive tangent-modulus curves for 6061-T6 aluminum alloy sheet at room temperature.

Figure 3.6.2.2.6(h). Typical tensile stress-strain curves for 6061-T6 aluminum alloy extrusion at room temperature. All thicknesses.

Figure 3.6.2.2.6(i). Typical compressive stress-strain and compressive tangent-modulus curves for 6061-T6 aluminum alloy extrusion at room temperature. All thicknesses.

Figure 3.6.2.2.6(j). Typical tensile and compressive stress-strain and compressive tangent-modulus curves for 6061-T651X aluminum alloy extrusion at room temperature. Thickness = 0.499 in.

Figure 3.6.2.2.6(k). Typical tensile and compressive stress-strain and compressive tangent-modulus curves for 6061-T651X aluminum alloy extrusion at room temperature. Thickness = 3.000 in.

Figure 3.6.2.2.6(l). Typical tensile stress-strain curve (full range) for 6061-T6 aluminum alloy sheet at room temperature.

Figure 3.6.2.2.6(m). Typical tensile stress-strain curves (full range) for 6061-T62 aluminum alloy extrusion at room temperature. All thicknesses.

Figure 3.6.2.2.6(n). Typical tensile stress-strain curves (full range) for 6061-T651X aluminum alloy extrusion at room temperature. Thickness ≤ 0.499 in.

Figure 3.6.2.2.6(o). Typical tensile stress-strain curves (full range) for 6061-T651X aluminum alloy extrusion at room temperature. Thickness = 3.000 in.

Figure 3.6.2.2.8. Best-fit S/N curves for unnotched 6061-T6 aluminum alloy, various wrought products, longitudinal direction.

Stresses are based on net section.

Correlative Information for Figure 3.6.2.2.8

Product Form: Drawn rod, 0.75 inch diameter; rolled bar, 1 x 7.5 inch

Properties:

TUS, ksi	TYS, ksi	Temp., °F
45	40	RT

Specimen Details: Unnotched
0.200 inch net diameter

Surface Condition: Not specified

Reference: 3.2.1.1.8(a)

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Test Parameters:
Loading - Axial
Frequency - 2000 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log N_f = 20.68−9.84 log (S_eq)
S_eq = S_max (1−R)^0.63
Std. Error of Estimate, Log (Life) = 0.48
Standard Deviation, Log (Life) = 1.18
R² = 83%

Sample Size = 55

3.6.36151 Alloy

3.6.3.0Comments and Properties

6151 is an Al-Mg-Si alloy whose use has been restricted primarily to die forgings. It provides higher strengths than attainable with 6061, and has high resistance to corrosion. Refer to Section 3.1.3.4 for comments regarding the weldability of the alloy.

Material specifications for 6151 aluminum alloy are presented in Table 3.6.3.0(a). Room-temperature mechanical and physical properties are shown in Table 3.6.3.0(b). The effect of temperature on thermal expansion is shown in Figure 3.6.3.0.

Table 3.6.3.0(a). Material Specifications for 6151 Aluminum Alloy
Specification	Form
AMS 4125	Die forging
AMS-A-22771	Forging

The temper index for 6151 is as follows:

3.6.3.1 — T6

Table 3.6.3.0(b). Design Mechanical and Physical Properties of 6151 Aluminum Alloy Die Forging
Specification	AMS 4125 and AMS-A-22771
Form	Die forging
Temper	T6
Thickness^a, in.	≤4.000
Basis	S
Mechanical Properties:
F_tu, ksi:
L	44
T^b	44
F_ty, ksi:
L	37
T^b	37
F_cy, ksi:
L	39
T^b	35
F_su, ksi	28
F_bru, ksi:
(e/D = 1.5)	···
(e/D = 2.0)	···
F_bry, ksi:
(e/D = 1.5)	···
(e/D = 2.0)	···
e, percent:
L	10
T^b	6
E, 10³ ksi	10.1
E_c, 10³ ksi	10.3
G, 10³ ksi	3.85
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, Btu/(lb)(°F)	0.23 (at 212°F)
K, Btu/[(hr)(ft²)(°F)/ft]	100 (at 77°F)
α, 10^-6 in./in./°F	See Figure 3.6.3.0
^a Thickness at the time of heat treatment. When die forgings are machined before heat treatment, the mechanical properties are applicable provided the as-forged thickness is not greater than twice the thickness at the time of heat treatment.
^b T indicates any grain direction not within ±15° of being parallel to the forging flow lines.

Figure 3.6.3.0. Effect of temperature on the thermal expansion of 6151 aluminum alloy.

3.6.3.1T6 Temper

Elevated-temperature modulus data from Figure 3.6.2.2.4 (6061 alloy) may be used for this alloy.

Other MIL-HDBK-5 Chapters

Chapter 2 (Steel) Chapter 4 (Magnesium)

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