HEAT TREATMENT STRENGTHENING EFFECTS OF RARE EARTHS ON Mg-9Al ALLOY

金属学报(英文版), 2003, 16(1): 8-14.

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1.Shanghai Cosmopolitan Automobile Accessory Co. LTD, Shanghai 200083, China

2.Shanghai Cosmopolitan Automobile Accessory Co. LTD, Shanghai 200083, China

3.School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China

4.School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China

HEAT TREATMENT STRENGTHENING EFFECTS OF RARE EARTHS ON Mg-9Al ALLOY

Mg-9Al-xRE magnesium alloys were studied, where x is 0, 0.4, 0.8, 1.2 and 1.6% (inweight percent, wt%), respectively. Influence of rare earths (RE) on microstructureand strength in both T4 (solute heat treatment) and T6 (solute heat treatment andartificial ageing treatment) were investigated. Strength of specimen was tested at am-bient temperature. The microstructure was analyzed by optical microscopy, scanningelectron microscopy (SEM) and X-ray diffraction analysis. RE additions improvedT4 tensile strength of the treated alloys. Small addition (0.4wt%) of RE greatly im-proved the strength of ageing treated (T6) Mg-9Al alloy, but further additions caused decreasing.

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HEAT TREATMENT STRENGTHENING EFFECTS OF RARE EARTHS ON Mg-9Al ALLOY

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