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to Properties of magnesium alloys
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| Cast magnesium alloy HK31A | ||||
| Chemical composition: Th=3.25%, Zr = 0.7%, Mg balance | ||||
| Property | Value in metric unit | Value in US unit | ||
| Density | 1.80 *10³ | kg/m³ | 112 | lb/ft³ |
|---|---|---|---|---|
| Modulus of elasticity | 45 | GPa | 6530 | ksi |
| Thermal expansion (20 ºC) | 26.8*10-6 | ºCˉ¹ | 14.9*10-6 | in/(in* ºF) |
| Specific heat capacity | 1000 | J/(kg*K) | 0.239 | BTU/(lb*ºF) |
| Thermal conductivity | 92.0 | W/(m*K) | 638 | BTU*in/(hr*ft²*ºF) |
| Electric resistivity | 6.0*10-8 | Ohm*m | 6.0*10-6 | Ohm*cm |
| Tensile strength (annealed) | 228 | MPa | 33000 | psi |
| Yield strength (annealed) | 145 | MPa | 21000 | psi |
| Elongation (annealed) | 23 | % | 23 | % |
| Shear strength (annealed) | 131 | MPa | 19000 | psi |
| Hardness (annealed) | 55 | RE | 55 | RE |
| Tensile strength (T6) | 221 | MPa | 32000 | psi |
| Yield strength (T6) | 103 | MPa | 15000 | psi |
| Elongation (T6) | 8 | % | 8 | % |
| Shear strength (T6) | 145 | MPa | 21000 | psi |
| Hardness (T6) | 66 | HB(500) | 66 | HB(500) |
| Annealing temperature | 398 | ºC | 750 | ºF |
| Solution temperature | 565 | ºC | 1050 | ºF |
| Aging temperature | 205 | ºC | 400 | ºF |
| Aging time | 16 | hrs. | 16 | hrs. |
| Liquidus temperature | 651 | ºC | 1204 | ºF |
| Solidus temperature | 589 | ºC | 1092 | ºF |