Magnesium Alloy Materials

Magnesium alloys are the lightest structural metals at 1.74–1.83 g/cm³—33% lighter than aluminum and 77% lighter than steel. AZ91D (9% Al) is the dominant die casting alloy for laptop cases, camera bodies, and automotive steering wheels. AZ31B is the standard wrought grade for sheet and extrusion. Key limitations: poor corrosion resistance requiring protective coatings, galvanic corrosion when contacting dissimilar metals, limited elevated-temperature strength (creep above 120°C for AZ alloys), and flammable machining chips. Used where weight reduction justifies the higher per-kg cost.

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