丁科,金秋敏,廖恒成

• 1:东南大学材料科学与工程学院江苏省先进金属材料重点实验室

摘要(Abstract)：

通过Brinell硬度和拉伸测试以及OM,SEM和TEM的组织观察,研究了形变热处理对Al-12.0%Si-0.2%Mg合金组织与力学性能的影响。结果表明,通过形变热处理可以显著提高试验合金的硬度、强度及伸长率。该合金经500℃热挤压、(535±5)℃固溶、160℃时效12h处理后Brinell硬度可达85.7HBS,抗拉强度为256.3MPa,伸长率为15.0%。热挤压过程加速共晶Si相发生碎断与球化,细小的Si颗粒分布均匀,结合强化相在时效过程中弥散析出,导致形变热处理条件下合金的强度及伸长率同时提高。SEM和TEM观察显示,合金在热挤压过程中发生了基体Al的再结晶及Si和Mg2Si相的析出。

关键词(KeyWords)： 形变热处理;Al-12.0%Si-0.2%Mg合金;力学性能;显微组织

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 丁科,金秋敏,廖恒成

DOI: 10.13289/j.issn.1009-6264.2010.08.018

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