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OALib Journal期刊
ISSN: 2333-9721
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半固态alsi4mg2铝合金的稳态流变性能
Keywords: 金属材料,铝合金,半固态,流变性,表观粘度
Abstract:
？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和剪切速率之间的关系可以近似地表示为ηa=25.5exp(6.13fs)-1.16.
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