摘要
引入等径角挤压(ECAP)法替代传统半固态坯料制备方法——应变诱导熔体激活(SIMA)法中的冷、热塑性变形,在正交试验条件下由AlSi30合金粉末制备其半固态坯料,研究了工艺参数对半固态坯料显微组织的影响。结果表明,保温温度是影响初晶硅晶粒大小和圆整程度的主要因素;影响初晶硅晶粒大小的次要因素是保温时间;影响初晶硅圆整度的次要因素是等径角挤压的温度;试验的最佳工艺参数,等径角挤压温度为500℃,挤压路径选择A路径,保温温度为605℃,保温时间为55min。
AlSi30 semi-solid billets were fabricated from AlSi30 alloy powder by using ECAP(equal channel angular pressing)method as a substitute for thermal and cold plastic deformation in the SIMA method(strain induced melt activation)based on orthogonal testing,and effects of processing parameters on microstructure of the semi-solid billets were investigated.The results show that the holding temperature is dominant in controlling grain size and spheroidization rate of primary Si phase,and then holding time,then pressing temperature of equal channel angular.The desirable grain size and spheroidization rate of the primary Si in the semi-solid billets can be observed with holding at 605℃ for 55 min and pressing at 500℃ based on A route.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2009年第6期524-527,共4页
Special Casting & Nonferrous Alloys
基金
安徽省自然科学基金资助项目(070414148)
安徽省优秀青年科技基金资助项目(04044058)
