2007•Cailiao rechuli xuebaoRequires access
Study on ignition-proof AZ91D-0.3Be-RE magnesium alloy
Han Fu-yin
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Abstract
The effects of Be addition on ignition-proof property and mischmetall addition on microstructure and mechanical properties of AZ91D-0.3Be-RE magnesium alloy were studied.The results show that Be addition can effectively increase ignition temperature.By doping 0.3 %Be to magnesium alloy,the ignition temperature increases about 300℃ and the alloy can be melted in air.Rare-earth inhibits non-equilibrium solidification of magnesium alloy and precipitation of Mg_(17)Al_(12) phase and strengthens the matrix.Petal-like and short-bar-like Al_4RE phase prevents the crack forming and increases the fracture resistance of the alloy.The roomtemperature tensile strength of both the solid-solutioned and aged alloy is increased by 20%.The hardness of the as-cast alloy is increased by 20% and of the aged alloy by 30%.For the high thermal stability of Al_4RE phase,the high-temperature tensile strength of the as-cast alloy is increased by 50% and of the aged alloy by 30%.The elongation of both the as-cast and aged alloy is increased by 100%.