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金属学报  2005 

Sr,B添加对Al--15.5%Si合金中共晶团尺寸的影响

, PP. 1047-1052

Keywords: Al--Si合金,共晶团,Sr,B,显微组织

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Abstract:

考察了Sr,B及Sr+B联合作用对Al--15.5%Si(质量分数)合金中共晶团尺寸大小的影响。实验结果表明,随合金中Sr量增加,共晶团尺寸呈减少的趋势,冷却速度对共晶团的影响也很显著;在Sr变质的合金中加入B,共晶团尺寸先显著下降,随B量增加降低幅度趋于平缓;在未变质的Al--15.5%Si合金中单独加B,共晶硅由粗大的片状变为细长的层片状,层片间距明显降低。分析认为,合金中加入Sr,导致共晶过冷度增大,因而共晶团形核驱动力增大促使共晶团细化;合金中加入B,增加了共晶团有效形核基底的数量促使共晶团显著细化。

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