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	PRODUCT DATA of AZ31B

Material

AZ31B

General Information

Magnesium-Aluminium-Zinc-Manganese Alloy

Chemical Composition

3% Al, 1% Zn, 0.2%Mn, Rem. Mg

Name of Manufacturer

Magnesium Elektron PO Box 23, Swinton, Manchester M27 8DD, UK + 44 (0)161 911 1000 + 44 (0)161 911 1010 www.magnesium-elektron.com

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

Cost Range

Low

Equivalent Designations

ASTM AZ31B, BS 111, DIN 1729, MgAl3Zn

Space Experience

Good

	PHYSICAL PROPERTIES

Specific Gravity

1.78

	ELECTRICAL PROPERTIES

Electrical Volume Resistivity

9.2e-7 ohm.m @RT

	THERMAL PROPERTIES

Temperature Range

150 °C(maximum)

Thermal Conductivity

84 W/m.K @RT

Thermal Expansion Coefficient

26 to 27 μstrain/°C @RT

Specific Heat

1 J/g.K

Melting Range

605 to 630 °C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status

Requires specific corrosion protection

Atmospheric Corrosion

Has poor resistance to atmospheric corrosion and should always be protected. Protective treatment can be either anodising or chromating and painting

Stress Corrosion Status

Low Resistance to SCC: Table 3 Remark: Not for primary structural items Is prone to stress corrosion cracking in air, fresh water, sea water and salt solutions. Not suitable for structural applications. For high stress applications, see ECSS-Q-ST -70-36C Remark: Requires Stress corrosion evaluation form Remark: acc. to ECSS-Q-ST-70-36C Data Quality: Design Data

EMF vs SCE

-1.6 V Remark:measured in 3.5% NaCl

Bimetallic Corrosion

Can be connected in a clean room environment to: Sn-Pb alloys, Sn, Pb Needs specific measures: All others

Temperature Range(space)

Maximum application temperature is 150°C.

	SPECIAL RECOMMENDATIONS

Special Recommendations

The part should be Lanolin covered or oiled at all times during machining and prior to protective treatments so as to avoid corrosion. · Protective treatments can be either: 1. Anodising and painting, 2. Chromating and painting. · The part should never make direct contact with other metals. Magnesium is more electrochemically negative than all other commonly used metals and will therefore be sacrificially corroded in any electrochemical cell that is created.