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Influence of Heat Treatment on Mechanical Properties and Microstructure of Mg-Gd-Y-Zr Alloy

ZHANG Jia-zhen,MA Zhi-xin,LI De-fu(General Research Institute for Nonferrous Metals,Beijing 100088,China)  
The effects of different heat-treatment conditions on the microstructure and mechanical properties of Mg-Gd-Y-Zr alloy were investigated by tensile test and hardness measurement.The results show the solution treatment can increase δ5 about 40%;the extrusion can improve the mechanical properties,compared with the alloy as-cast,the σb,σ0.2 increases 25%,30%,respectively;and the δ5 can achieve 14.9%;the aging after extrusion can obviously improve the strength,the σb,σ0.2 achieves 420MPa,310MPa,respectively,but δ5 is decreased to 7.5%.
【CateGory Index】: TG166.4
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