Magnesium HK31A-T6, Cast

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Magnesium HK31A-T6, Cast
Categories:	Metal; Nonferrous Metal; Magnesium Alloy
Material Notes:
Key Words:	UNS M13310; Mg
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Physical Properties	Original Value	Comments

Density	1.80 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	55	500 kg load, 10 mm ball
Hardness, Knoop	70	Estimated from Brinell
Tensile Strength, Ultimate	220 MPa
	300 MPa @Temperature -78.0 °C
	330 MPa @Temperature -196 °C
	62.0 MPa @Temperature 315 °C, Time 3.60e+6 sec	tested at elevated temperature
	125 MPa @Temperature 315 °C, Time 601 sec	tested at elevated temperature
	180 MPa @Temperature 205 °C, Time 3.60e+6 sec	tested at elevated temperature
	195 MPa @Temperature 150 °C, Time 601 sec	tested at elevated temperature
Tensile Strength, Yield	120 MPa @Temperature -78.0 °C
	135 MPa @Temperature -196 °C
	105 MPa @Strain 0.2 %
Elongation at Break	8.0 %	in 50 mm
	6.1 % @Temperature -196 °C
	8.6 % @Temperature -78.0 °C
Creep Strength	14.0 MPa @Temperature 315 °C, Time 3.60e+6 sec	0.2% total extension
	64.0 MPa @Temperature 205 °C, Time 3.60e+6 sec	0.2% total extension
Modulus of Elasticity	39.0 GPa @Temperature 315 °C
	40.0 GPa @Temperature 205 °C
Tensile Modulus	45.0 GPa
Compressive Yield Strength	105 MPa	at 0.2% offset
Ultimate Bearing Strength	420 MPa
Bearing Yield Strength	275 MPa
Poissons Ratio	0.35
Fatigue Strength	70.0 MPa @# of Cycles 1.00e+8	R.R. Moore Test
Machinability	100 %	Relative Rating, 100=Best
Shear Modulus	17.0 GPa
Shear Strength	145 MPa
Charpy Impact	3.80 J	V-notch
	3.05 J @Temperature -196 °C	Notched
	3.21 J @Temperature -78.0 °C	Notched
Charpy Impact, Unnotched	13.72 J @Temperature -196 °C
	16.43 J @Temperature -78.0 °C
	16.61 J @Temperature 24.0 °C

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000770 ohm-cm

Thermal Properties	Original Value	Comments
Heat of Fusion	325 J/g
CTE, linear	26.8 µm/m-°C @Temperature 0.000 - 100 °C
	27.0 µm/m-°C @Temperature 20.0 - 200 °C	Estimated from similar Mg alloys
Specific Heat Capacity	1.00 J/g-°C
Thermal Conductivity	92.0 W/m-K
Melting Point	590 - 650 °C
Solidus	590 °C
Liquidus	650 °C

Component Elements Properties	Original Value	Comments
Copper, Cu	<= 0.10 %
Magnesium, Mg	96 %	As Remainder
Nickel, Ni	<= 0.010 %
Thorium, Th	2.5 - 4.0 %
Zinc, Zn	<= 0.30 %
Zirconium, Zr	0.40 - 1.0 %

References for this datasheet.

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MMHK31 / 12440

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