科研之友
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摘要
Microstructure and mechanical behavior of the squeeze-casting and squeeze-casting plus T6 heat-treated Mg-8Gd-2Y-0.4Zr magnesium alloys at room and elevated temperatures were investigated. The experimental results showed that the T6 treated alloy aged at slightly high temperature exhibited good comprehensive strength and ductility. However, the strength of the tested alloys was not sensitive to the change of tensile temperature, i e. the yield strength and ultimate tensile strength did not decrease significantly with increasing tensile temperature, while the ductility increased greatly. In addition, the squeeze-casting alloy exhibited predominant intergranular fracture accompanied by minor transgranular rupture, and the tensile fracture mode for the 'f6 treated alloy had typical transgranular cleavage fracture.
