AM100A is a magnesium-base casting alloy in the Section 4.3 Magnesium Cast Alloys group, containing aluminum and a small amount of manganese as the principal alloying elements.
AM100A is a magnesium-base casting alloy containing aluminum and a small amount of manganese. It is primarily used as permanent mold castings. AM100A has about the same characteristics as AZ92A. AM100A has less tendency to microshrinkage and hot shortness than the Mg-Al-Zn alloys. It has good weldability and fair pressure tightness.
Material specifications for AM100A are given in Table 4.3.1.0(a). Room-temperature mechanical and physical properties are shown in Table 4.3.1.0(b).
| Specification | Form |
|---|---|
| AMS 4455 | Investment casting |
| AMS 4483a | Permanent mold casting |
| a Noncurrent specification. | |
Table 4.3.1.0(b) — Design Mechanical and Physical Properties of AM100A Magnesium Alloy Casting (AMS 4455 / AMS 4483, T6 temper) — pending digitization (dense multi-column property table; MIL-HDBK-5J p. 4-28).
AZ91C is a magnesium-base casting alloy containing aluminum and zinc. AZ91E is a version which contains a significantly lower level of impurities resulting in improved corrosion resistance. These alloys have good castability with a good combination of ductility and strength. AZ91C and AZ91E are the most commonly used sand castings for temperatures under 300°F. AZ91C is available as sand and investment castings, while AZ91E is available as a sand casting. AZ91C and AZ91E have fair weldability and pressure tightness.
Some material specifications covering AZ91C/AZ91E are presented in Table 4.3.2.0(a). Room-temperature mechanical and physical properties are shown in Tables 4.3.2.0(b) and (c).
| Specification | Form |
|---|---|
| AMS 4437 | Sand casting |
| AMS 4452 | Investment casting |
| AMS 4446 | Sand casting |
The temper index for AZ91C/AZ91E is as follows:
| Section | Temper |
|---|---|
| 4.3.2.1 | T6 |
Table 4.3.2.0(b) — Design Mechanical and Physical Properties of AZ91C Magnesium Alloy Casting (AMS 4437 sand casting / AMS 4452 investment casting, T6 temper) — pending digitization (dense multi-column property table; MIL-HDBK-5J p. 4-30).
Table 4.3.2.0(c) — Design Mechanical and Physical Properties of AZ91E Magnesium Alloy Casting (AMS 4446 sand casting, T6 temper) — pending digitization (dense multi-column property table; MIL-HDBK-5J p. 4-31).
Figure 4.3.2.1.4 contains an elevated-temperature curve for tension and compression moduli. Typical tensile stress-strain curves at room temperature and several elevated temperatures are presented in Figure 4.3.2.1.6.
Figure 4.3.2.1.4. Effect of temperature on the tensile and compressive moduli (E and Ec) of cast AZ91C-T6/AZ91E-T6. Modulus at temperature, exposure up to ½ hour.
Figure 4.3.2.1.6. Typical tensile stress-strain curves for cast AZ91C-T6/AZ91E-T6 at room and elevated temperatures, ½-hour exposure (RT, 300°F, 400°F). Ramberg-Osgood n (RT) = 4.5, n (300°F) = 3.9, n (400°F) = 5.3.
AZ92A is a magnesium-base casting alloy containing aluminum and zinc. It is slightly stronger and less ductile than AZ91C but is much like it in other characteristics. It is available as sand and permanent-mold casting. AZ92A has fair weldability and pressure tightness.
Material specifications for AZ92A are presented in Table 4.3.3.0(a). Room-temperature mechanical and physical properties are shown in Table 4.3.3.0(b). Elevated temperature curves for physical properties are shown in Figure 4.3.3.0.
| Specification | Form |
|---|---|
| AMS 4434 | Sand casting |
| AMS 4484a | Permanent-mold casting |
| AMS 4453 | Investment casting |
| a Noncurrent specification. | |
The temper index for AZ92A is as follows:
| Section | Temper |
|---|---|
| 4.3.3.1 | T6 |
Table 4.3.3.0(b) — Design Mechanical and Physical Properties of AZ92A Magnesium Alloy Casting (AMS 4484 permanent mold / AMS 4434 sand / AMS 4453 investment casting, T6 temper) — pending digitization (dense multi-column property table; MIL-HDBK-5J p. 4-34).
Figure 4.3.3.0. Effects of temperature on the physical properties of cast AZ92A-T6.
Elevated-temperature curves for various mechanical properties are presented in Figures 4.3.3.1.1(a) through (c), and 4.3.3.1.4. Typical stress-strain and tangent-modulus curves at room temperature and several elevated temperatures are shown in Figures 4.3.3.1.6(a) and (b).
Figure 4.3.3.1.1(a). Effect of temperature on the tensile ultimate strength (Ftu) of cast AZ92A-T6. Strength at temperature, exposure up to 1000 hours.
Figure 4.3.3.1.1(b). Effect of temperature on the tensile yield strength (Fty) of cast AZ92A-T6. Strength at temperature, exposure up to 1000 hours.
Figure 4.3.3.1.1(c). Effect of exposure at elevated temperature on the room-temperature tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of cast AZ92A-T6, exposure up to 1000 hours.
Figure 4.3.3.1.4. Effect of temperature on the tensile and compressive moduli (E and Ec) of cast AZ92A-T6. Modulus at temperature, exposure up to ½ hour.
Figure 4.3.3.1.6(a). Typical compressive stress-strain and compressive tangent-modulus curves for cast AZ92A-T6 at room temperature.
Figure 4.3.3.1.6(b). Typical tensile stress-strain curves for cast AZ92A-T6 at room and elevated temperatures (RT, 300°F, 400°F), ½-hour exposure.
EZ33A is a magnesium-base casting alloy containing rare earths, zinc, and zirconium. It is available as sand castings in the artificially aged (T5) temper. EZ33A has lower strength than the Mg-Al-Zn alloys at room temperature but is less affected by increasing temperature. It is generally used for applications at temperatures of 300 to 500°F. EZ33A castings are very sound and are sometimes used for pressure tightness. It has good stability in the T5 temper and excellent weldability. It is sometimes used for applications requiring good damping ability.
A material specification for EZ33A is presented in Table 4.3.4.0(a). Room-temperature mechanical and physical properties are shown in Table 4.3.4.0(b). The effect of temperature on physical properties is shown in Figure 4.3.4.0.
| Specification | Form |
|---|---|
| AMS 4442 | Sand casting |
The temper index for EZ33A is as follows:
| Section | Temper |
|---|---|
| 4.3.4.1 | T5 |
Table 4.3.4.0(b) — Design Mechanical and Physical Properties of EZ33A Magnesium Alloy Casting (AMS 4442 sand casting, T5 temper) — pending digitization (dense multi-column property table; MIL-HDBK-5J p. 4-40).
Figure 4.3.4.0. Effect of temperature on the physical properties of cast EZ33A.
Elevated-temperature curves for tensile properties are presented in Figures 4.3.4.1.1(a) through (c). A typical tensile stress-strain curve at room temperature is presented in Figure 4.3.4.1.6.
Figure 4.3.4.1.1(a). Effect of temperature on the tensile ultimate strength (Ftu) of cast EZ33A-T5.
Figure 4.3.4.1.1(b). Effect of temperature on the tensile yield strength (Fty) of cast EZ33A-T5.
Figure 4.3.4.1.1(c). Effect of exposure at elevated temperatures on the room-temperature tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of cast EZ33A-T5.
Figure 4.3.4.1.6. Typical tensile stress-strain curve for cast EZ33A-T5 at room temperature. Ramberg-Osgood n (RT) = 15.
QE22A is a magnesium-base alloy containing silver, rare earths in the form of didymium, and zirconium. It is available as sand and permanent-mold castings. It is used in the solution heat-treated and artificially aged (T6) condition where a high yield strength is needed at temperatures up to 600°F. QE22A has good weldability and fair pressure tightness.
Material specifications for QE22A are presented in Table 4.3.5.0(a). Room-temperature mechanical and physical properties are shown in Table 4.3.5.0(b).
| Specification | Form |
|---|---|
| AMS 4418 | Sand casting |
The temper index for QE22A is as follows:
| Section | Temper |
|---|---|
| 4.3.5.1 | T6 |
Table 4.3.5.0(b) — Design Mechanical and Physical Properties of QE22A Magnesium Alloy Casting (AMS 4418 sand casting, T6 temper) — pending digitization (dense multi-column property table; MIL-HDBK-5J p. 4-45).
Elevated-temperature curves for various tensile properties and modulus of elasticity are presented in Figures 4.3.5.1.1 and 4.3.5.1.4. Typical tensile stress-strain curves at various temperatures from room temperature through 700°F are shown in Figure 4.3.5.1.6.
Figure 4.3.5.1.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of cast QE22A-T6.
Figure 4.3.5.1.4. Effect of temperature on the tensile modulus (E) of cast QE22A-T6.
Figure 4.3.5.1.6. Typical tensile stress-strain curves for cast QE22A-T6 at room and elevated temperatures (RT, 300°F, 400°F, 500°F, 600°F, 700°F), ½-hour exposure. Ramberg-Osgood n (RT) = 6.5, n (300°F) = 7.9, n (400°F) = 9.0, n (500°F) = 6.3, n (600°F) = 4.8, n (700°F) = 3.9.
ZE41A is a magnesium-base casting alloy containing zinc, zirconium, and rare earth elements. It is available as sand or permanent-mold castings in the artificially aged temper (T5). ZE41A has a higher yield strength than the Mg-Al-Zn alloys at room temperature and is more stable at elevated temperatures. It is useful for applications at temperatures up to 320°F. ZE41A castings possess good weldability and are pressure tight.
A material specification for ZE41A is presented in Table 4.3.6.0(a). Room-temperature mechanical and physical properties are shown in Table 4.3.6.0(b). The effect of temperature on thermal conductivity is shown in Figure 4.3.6.0.
| Specification | Form |
|---|---|
| AMS 4439 | Sand casting |
The temper index for ZE41A is as follows:
| Section | Temper |
|---|---|
| 4.3.6.1 | T5 |
Table 4.3.6.0(b) — Design Mechanical and Physical Properties of ZE41A Magnesium Alloy Casting (AMS 4439 sand casting, T5 temper) — pending digitization (dense multi-column property table; MIL-HDBK-5J p. 4-49).
Figure 4.3.6.0. Effect of temperature on the thermal conductivity (K) of ZE41A-T5 sand casting.
Elevated-temperature curves for tensile yield and ultimate strengths are presented in Figure 4.3.6.1.1. The effect of temperature on the tensile modulus of elasticity is shown in Figure 4.3.6.1.4. Figures 4.3.6.1.6(a) and (b) contain tensile and compressive stress-strain curves as well as a compressive tangent-modulus curve.
Figure 4.3.6.1.1. Effect of temperature on the tensile ultimate strength (Ftu) and tensile yield strength (Fty) of ZE41A-T5 sand casting.
Figure 4.3.6.1.4. Effect of temperature on the tensile modulus (E) of ZE41A-T5 sand casting.
Figure 4.3.6.1.6(a). Typical tensile stress-strain curves for ZE41A-T5 sand casting at room and elevated temperatures.
Figure 4.3.6.1.6(b). Typical compressive stress-strain and tangent-modulus curves for ZE41A-T5 sand casting at room temperature. Ramberg-Osgood n (compression) = 3.7.