中文摘要：

微结构进化和 7075 铝合金经由再结晶和部分 remelting (敲击) 过程生产了的半固体的变粗的率上的等温的处理的效果被调查。7075 铝合金的样品受到冷挤出，并且半固体处理在从 580 到经由诱导地联合的血浆决定的 605omposition 的温度为 5-30 min 被执行光排放光谱学。金属性的铁粒子尺寸和在在在 1350ober 使处理凉下来的水以后的一个减少的煤饼的 Fe， V， Cr，和 Ti 的元素分发 2012 (OSD 组) 。从 2013 年 3 月到 2015 年 2 月，迷幻药在 26 个病人上被执行(迷幻药 grou

英文摘要：

The effects of isothermal treatments on the microstructural evolution and coarsening rate of semi-solid 7075 aluminum alloy produced via the recrystallization and partial remelting （RAP） process were investigated. Samples of 7075 aluminum alloy were subjected to cold extrusion, and semi-solid treatment was carried out for 5-30 min at temperatures ranging from 580 to 605℃. A backward-extrusion experiment was conducted to investigate liquid segregation during the thixoforming process. The results revealed that obvious grain coarsening and spheroidization occurred during prolonged isothermal treatments. In addition, higher soaking temperatures promoted the spheroidization and coarsening process because of the increased liquid fraction and the melting of second phases. Segregation of the liquid phase caused by the difference in fluidity between the liquid and the solid phases was observed in different regions of the thixoformed specimens.