Effect of Heat Treatment on Microstructures And Properties of Mg-9Gd-3Y-0.3Zr Cast Alloy
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Yang Sheng Yi Danqing Yao Sujuan Li Wangxing
Key words：magnesium alloy; RE; microstructure; fracture;
Abstract: Microstructures, aging hardness and mechanical properties of as-cast Mg-9Gd-3Y-0.3Zr alloy were investigated. The microstructure is a typical dendritic structure of as-cast sample. The aging test was carried at 250℃ and at a different aging time. The aging peak hardness is about 110HV of as-cast T6 alloy and higher than that of as-cast T5 alloy, tensile test result showed that tensile strength of as-cast T6 is higher than as-cast T5 but the elongation of as-cast T5 is higher than as-cast T6. The fracture mode of as-cast T6 is intergranular and transgranular cleavage fracture, but as-cast T5 is mainly microvoid coalescence fracture combination the brittle cleavage fracture.
Yang Sheng1，Yi Danqing1，Yao Sujuan1，Li Wangxing2
(1.School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2.Zhengzhou Research Institute of CHALCO, Zhengzhou 450041, China)
Abstract:Microstructures, aging hardness and mechanical properties of as-cast Mg-9Gd-3Y-0.3Zr alloy were investigated. The microstructure is a typical dendritic structure of as-cast sample. The aging test was carried at 250℃ and at a different aging time. The aging peak hardness is about 110HV of as-cast T6 alloy and higher than that of as-cast T5 alloy, tensile test result showed that tensile strength of as-cast T6 is higher than as-cast T5 but the elongation of as-cast T5 is higher than as-cast T6. The fracture mode of as-cast T6 is intergranular and transgranular cleavage fracture, but as-cast T5 is mainly microvoid coalescence fracture combination the brittle cleavage fracture.
Key words:magnesium alloy; RE; microstructure; fracture;
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