AZ31C (AZ31C-F, M11312) Magnesium
AZ31C magnesium is a magnesium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. AZ31C is the ASTM designation for this material. M11312 is the UNS number. It has a very high ductility and a very high thermal conductivity among magnesium alloys.
The graph bars on the material properties cards below compare AZ31C magnesium to other magnesium alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
45 GPa 6.5 x 106 psi
Elongation at Break
12 %
Fatigue Strength
150 MPa 22 x 103 psi
Poisson's Ratio
0.29
Shear Modulus
17 GPa 2.5 x 106 psi
Shear Strength
130 MPa 19 x 103 psi
Tensile Strength: Ultimate (UTS)
260 MPa 37 x 103 psi
Tensile Strength: Yield (Proof)
200 MPa 29 x 103 psi
Thermal Properties
Latent Heat of Fusion
350 J/g
Maximum Temperature: Mechanical
110 °C 230 °F
Melting Completion (Liquidus)
600 °C 1120 °F
Melting Onset (Solidus)
550 °C 1010 °F
Specific Heat Capacity
990 J/kg-K 0.24 BTU/lb-°F
Thermal Conductivity
130 W/m-K 72 BTU/h-ft-°F
Thermal Expansion
26 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
19 % IACS
Electrical Conductivity: Equal Weight (Specific)
98 % IACS
Otherwise Unclassified Properties
Base Metal Price
12 % relative
Density
1.7 g/cm3 110 lb/ft3
Embodied Carbon
23 kg CO2/kg material
Embodied Energy
160 MJ/kg 67 x 103 BTU/lb
Embodied Water
970 L/kg 120 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
28 MJ/m3
Resilience: Unit (Modulus of Resilience)
440 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
70 points
Strength to Weight: Axial
42 points
Strength to Weight: Bending
53 points
Thermal Diffusivity
74 mm2/s
Thermal Shock Resistance
16 points
Alloy Composition
| Mg | 93.4 to 97 | |
| Al | 2.4 to 3.6 | |
| Zn | 0.5 to 1.5 | |
| Mn | 0.15 to 1.0 | |
| Si | 0 to 0.1 | |
| Cu | 0 to 0.1 | |
| Ni | 0 to 0.030 | |
| res. | 0 to 0.3 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B107: Standard Specification for Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire
Advances in Wrought Magnesium Alloys: Fundamentals of Processing, Properties and Applications, Colleen Bettles and Matthew Barnett (editors), 2012
Welding and Joining of Magnesium Alloys, Liming Liu (editor), 2010
Essential Readings in Magnesium Technology, Suveen N. Mathaudhu et al. (editors), 2014
Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.
Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015