杨忠,郭永春,夏峰,段宏波,高培虎,李建平

• 1:西安工业大学材料与化工学院

摘要(Abstract)：

运用OM、SEM、EDS、TEM和原位拉伸试验研究了激光重熔处理前后和人工时效处理共晶型活塞铝合金(Al-12Si-2CuNi-Mg)的基体组织、多种复杂析出相的形状和尺寸的演变及其对拉伸强度的影响。结果表明:铝活塞合金重熔前的显微组织由α(Al)、粗大的块状初晶硅、针状共晶硅以及长棒状θ相(Al2Cu)、鱼骨状M相(Mg2Si)、长针状ε相(Al3Ni Cu)、Al7Cu4Ni、Al2Cu Mg和Al9Fe Ni组成;重熔后的显微组织由均匀细小的α(Al)和颗粒状共晶硅组成,复杂的金属间化合物相均已完全溶解,并以固溶原子形式存在于α(Al)里,产生细晶强化和固溶强化作用,使重熔区的拉伸强度提高了31%;经过时效处理,从α(Al)中析出细小均匀的纳米相θ相(Al2Cu Ni)和ε相(Al3Ni Cu),使重熔区的拉伸强度提高了47%。

关键词(KeyWords)： 活塞铝合金;激光重熔处理;显微组织;拉伸强度

Abstract:

Keywords:

基金项目(Foundation): 陕西省教育厅产业化项目(2012JC13);; 西安市科技局项目(CXY1342-3)

作者(Author): 杨忠,郭永春,夏峰,段宏波,高培虎,李建平

DOI: 10.13289/j.issn.1009-6264.2015.08.010

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