Microstructure and mechanical behavior of the squeeze-casting and squeeze-casting plus T6 heat-treated Mg-8 Gd-2 Y-0.4 Zr magnesium alloys at room and elevated temperatures were investigated. The experimental results ...Microstructure and mechanical behavior of the squeeze-casting and squeeze-casting plus T6 heat-treated Mg-8 Gd-2 Y-0.4 Zr 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 T6 treated alloy had typical transgranular cleavage fracture.展开更多
基金Project(0502)supported by the Aerospace Science and Technology Innovation Fund of China Aerospace Science and Technology CorporationProject(2007CB613701)supported by the National Basic Research Program of ChinaProject(2009AA033501)supported by the National High-tech Research and Development Program of China
基金Funded by the Major State Basic Research Development Program of China(2016YFB0701405)the National Natural Science Foundation of China(51705314)
文摘Microstructure and mechanical behavior of the squeeze-casting and squeeze-casting plus T6 heat-treated Mg-8 Gd-2 Y-0.4 Zr 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 T6 treated alloy had typical transgranular cleavage fracture.
