Microstructure evolution during reheating of extruded Mg-Gd-Y-Zr alloy into semisolid state

摘要：

The microstructure evolution of an extruded Mg-8.57Gd-3.72Y-0.54Zr (mass fraction,％,GW94) alloy during reheating into the semisolid state was investigated using optical microscopy (OM),scanning electron microscopy (SEM),and energy dispersive X-ray spectroscopy (EDX).Typical semisolid microstructure with globular solid particles distributed in the liquid matrix is obtained over 600 ℃.The solid content of (Gd+Y) in the primary α-Mg particles decreases with increasing the semisolid temperature.With the prolongation of isothermal holding time,the liquid fraction does not change significantly,while the grains grow up and spheroidize.Three methods used to determine the liquid fraction as a function of temperature,namely quantitative metallography on quenched microstructures,cooling curve thermal analysis,and thermodynamic calculations were further compared.

关键词： semisolid Mg-Gd-Y alloy partial remelting microstructural evolution

作者: GAO Lei LIANG Song-mao CHEN Rong-shi HAN En-hou

作者单位: State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of S State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of S

会议类型: 国际会议

会议名称: The 11th International Conference on Semi-Solid Processing of Alloy and Composites(第11届合金与复合材料半固态成形国际会议)

会议地点: 北京

会议语种:英文

页码: 1585-1590

在线出版日期: 2010-09-16（万方平台首次上网日期，不代表论文的发表时间）