【摘要】 采用添加变质剂和快速冷却相结合的方法,改善Al-27Si合金初晶硅的形貌和尺寸,并借助光学显微镜OM、分析软件Image Plus对初晶硅的尺寸、形貌、圆整度、粒度分布等进行了统计和分析。结果表明,细化Al-27Si合金初晶硅尺寸效果较好的变质处理和快速冷却的工艺为:变质剂添加量0.09%,变质温度880℃,变质时间30 min,型腔内径准10 mm的冷却模具。同时得到对初晶硅尺寸的影响因素,由大到小的顺序是:变质剂的添加量>冷却速度=变质时间>变质温度。更多还原

【Abstract】 The method of adding modifier with rapid cooling to improve the morphology and size of primary silicon in Al-27Si alloy,were investigated.The statistics and analysis of morphology,size,roundness,grain fineness distribution of primary silicon in Al-27Si alloy were studied by OM and Image Plus software.The results show that better method of adding modifier with rapid cooling for refining primary silicon of Al-27Si,amount of modifier with 0.09%,temperature with 880℃,time with 30 min,and cavity diameter with 10 mm in diameter of cooling mold.The descend order of influencing factors to size of primary silicon is amount of modifier,rate of cooling same to time,and temperature.更多还原