半固态AlSi4Mg2铝合金的稳态流变性能

材料研究学报, 2006, 20(1): 5-8. doi: 10.3321/j.issn:1005-3093.2006.01.002

半固态AlSi4Mg2铝合金的稳态流变性能

周志华 ^1, , 毛卫民 ^2, , 刘政 ^3, , 徐俊 ^4, , 石力开 ^5,

1.北京科技大学材料科学与工程学院,北京,100083

2.北京科技大学材料科学与工程学院,北京,100083

3.北京科技大学材料科学与工程学院,北京,100083

4.北京有色金属研究总院,北京,100088

5.北京有色金属研究总院,北京,100088

基金项目: 国家科技攻关项目(G2002AA336080) 中国科学院资助项目(50374012)

关键词：金属材料 , 铝合金 , 半固态 , 流变性能 , 表观粘度

Rheological behavior of semi-solid AlSi4Mg2 aluminum alloy at steady state

利用Couette型同轴双筒流变仪检测了半固态AlSi4Mg2合金浆料的等温稳态表观粘度.结果表明:半固态AlSi4Mg2合金浆料的稳态表观粘度随着固相分数的增加而增大,并且当固相分数达到某一临界值之后迅速增大.当固相分数较低时,半固态AlSi4Mg2合金浆料的粘滞力主要来自液态合金的粘度,但随着固相分数的增加,固相颗粒之间以及与液相之间的碰撞和摩擦变得越来越强烈,使得合金浆料的表观粘度越来越高.半固态AlSi4Mg2合金浆料的稳态表观粘度随着剪切速率的增大而减小,并且随着剪切速率的提高,表观粘度急剧增大,所对应的临界固相分数也随着增大.当剪切速率很高时,固相颗粒的形状更加趋于球化,浆料的粘滞力下降,浆料的表观粘度就更小.半固态AlSi4Mg2合金浆料的稳态表观粘度ηa与固相分数fs和剪切速率γ之间的关系可以近似地表示为ηa=25.5exp(6.13fs)γ-1.16.

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