Thermal Expansion of Common Magnesium Alloys

The coefficient of thermal expansion (CTE) is a measure that quantifies how much a material expands or contracts per unit change in temperature. Magnesium alloys typically have a higher CTE compared to some other engineering materials.

The following table provides a curated list of linear thermal expansion coefficients for different magnesium alloys, taken at room temperature (approximately 20°C or 68°F) and 1 atmospheric (atm) pressure. (1 atm = 101,325 Pa)

Click on the icon to switch between (1/°C) and (1/°F) units.

Linear Thermal Expansion of Magnesium Alloys
	UNS number	Composition
Pure magnesium		99.97	24.8
AM100A F	M10100	Mg-9.5Al-0.3Zn	25
AM60A F	M10600	Mg-6Al-0.5Si-0.35Cu	25.6
AM60B F	M10603	Mg-6Al-0.25Mn	25.6
AS41A F	M10410	Mg-4Al-1Si-0.35Mn	26.1
AS41XB F		Mg-4Al-1Si-0.35Mn	26.1
AZ10A	M11100	Mg-1.5Al-0.5Zn	26.6
AZ31B T1	M11312	Mg-3Al-1Zn	26
AZ61A F	M11610	Mg-6Al-1Zn	27.3
AZ63 T1	M11630	Mg-6Al-3Zn-0.3Si	26.1
AZ80A T4	M11800	Mg-8Al-0.5Zn	27.2
AZ81A T1	M11810	Mg-8Al-0.5Zn	25.5
AZ91A F	M11910	Mg-9Al-1Zn-0.1Mn	27
AZ91C T6	M11914	Mg-9Al-1Zn-0.1Mn	27
AZ92A T6	M11920	Mg-9Al-2Zn-0.3Si	26
EQ21 T6	M16330	Mg-1.5Ag-2Re	26.7
EZ33A T5	M12330	Mg-3Re-2.5Zn-0.6Zr	26.1
HK31A H24	M13310	Mg-3Th-1Zr	26.7
HM21A T8	M13210	Mg-2Th-0.5Mn	27
HM31A O	M13312	Mg-3Th-1.2Mn	26
HZ32A T5	M13320	Mg-2Zn-3Th-1Zr	26.7
K1A F	M18010	Mg-0.5Zr	27
M1A	M15100	Mg-1Mn-0.3Cr	26
QE22A T6	M18220	Mg-2.5Ag-2Re-0.6Zr	26.7
QH21A T6		Mg-2.5Ag-1Re-1Th-0.7Zr	26.7
WE43 T6	M18430	Mg-4Y-3.4Re-0.6Zr	26.7
WE54 T6	M18410	Mg-5.1Y-3Re-0.6Zr	24.6
ZC71 T6	M16710	Mg-6.5Zn-1Cu-0.8Mn	26
ZE63A T6	M16630	Mg-6Zn-2.5Re	26.5
ZH62A T5	M16620	Mg-5.5Zn-2Th-0.65Zr	27.1
ZK21A	M16210	Mg-2.3Zn-0.65Zr	27
ZK40A T5	M16400	Mg-4Zn-0.45Zr	26
ZK51A T5	M16510	Mg-4.5Zn-0.45Zr	26
ZK60A T5	M16600	Mg-5.5Zn-0.45Zr	26
ZK61A T6	M16610	Mg-6Zn-0.8Zr	27
ZM21 T1		Mg-2Zn-1Mn	27
ZW10 T1		Mg-1.3Zn-0.6Zr	27

The thermal expansion values in this table are approximate and can vary depending on the specific composition and processing of each alloy.

Related Tables

References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018.