Effects of heat treatments on microstructure and mechanical properties of Mg-15Gd-5Y-0.5Zr alloy
来源期刊：JOURNAL OF RARE EARTHS2008年第2期
论文作者：ZHAO Yang GAO Yan Junya Kaneda TONG Yan WANG Qudong GU Jinhai
Key words：Mg-Gd-Y-Zr alloys; solution heat treatment; microstructure; mechanical properties; rare earths;
Abstract: . Microstructure and mechanical properties of Mg-15wt.%Gd-5 wt.%Y-0.5wt.% Zr alloy were investigated in a series of conditions. The eutectic was dissolved into the matrix and there was no evident grain growth after solutionized at 525 °C for 12 h. The evolution of the phase constituents from as-cast to cast-T4 was as follows: α-Mg solid solution+Mg5(Gd,Y) eutectic compound→α-Mg solid solution+ spheroidized Mg5(Gd, Y) phase→α-Mg supersaturated solid solution+cuboid-shaped compound (Mg2Y3Gd2). And the precipitation sequences of Mg-15Gd-5Y-0.5Zr alloy were observed, according to the hardness response to isothermal ageing at 225-300 °C for 0-128 h.
ZHAO Yang1，GAO Yan1，Junya Kaneda2，TONG Yan1，WANG Qudong1，GU Jinhai3
(1.National Engineer Research Center of Light Alloys Net Forming, Shanghai Jiao Tong University, Shanghai 200030, China;
2.Hitachi, Ltd. Materials Research Laboratory, 1-1, Omika-cho 7-chome, Hitachi-shi, Ibaraki-ken 319-1292, Japan;
3.Hitachi China Research & Development Corp., Shanghai Research Institute, Shanghai 200020, China)
Abstract:. Microstructure and mechanical properties of Mg-15wt.%Gd-5 wt.%Y-0.5wt.% Zr alloy were investigated in a series of conditions. The eutectic was dissolved into the matrix and there was no evident grain growth after solutionized at 525 °C for 12 h. The evolution of the phase constituents from as-cast to cast-T4 was as follows: α-Mg solid solution+Mg5(Gd,Y) eutectic compound→α-Mg solid solution+ spheroidized Mg5(Gd, Y) phase→α-Mg supersaturated solid solution+cuboid-shaped compound (Mg2Y3Gd2). And the precipitation sequences of Mg-15Gd-5Y-0.5Zr alloy were observed, according to the hardness response to isothermal ageing at 225-300 °C for 0-128 h.
Key words:Mg-Gd-Y-Zr alloys; solution heat treatment; microstructure; mechanical properties; rare earths;
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