【摘要】 采用AlSi9Mg合金为试验原料,通过改变、控制浇注温度和半固态保温时间,研究了在近液相线区不同温度、不同保温时间下半固态合金的组织演变规律及成因。结果表明:随着保温时间的延长,合金固相显微组织逐渐从最初的树枝晶经蔷薇状形态向颗粒状晶粒转变。在605℃保温30～40min时,得到的细小、均匀、圆整的颗粒状非枝晶组织,满足半固态加工要求。更多还原

【Abstract】 Effects of pouring!temperature and holding time on microstructural evolution of semi-solid AlSi9Mg magnesium alloy were analyzed. It is found that with increasing in holding time, microstructure is converted from dendrite to rosette and then to spheroidized grain. The required fine and uniform spheroidized non-dendrite microstructure can be created with holding time for 30~40 min at 605℃.更多还原