固溶-时效对6082合金挤压棒材组织性能的影响Effect of solution and aging treatment on microstructure and properties of hot extruded 6082 aluminum alloy bars
商宝川,尹志民,周向,黄志其
摘要(Abstract):
采用力学性能、硬度、电导率测试和电子显微分析技术,研究了固溶-时效处理对6082铝合金挤压棒材组织与性能的影响。结果表明,6082挤压态合金组织除固溶体基体外,还包括微米级的含Cr和Mn的短棒状相、亚微米级的Mg2Si平衡相和α-(AlMnFeSi)夹杂相;固溶过程中亚微米级的Mg2Si平衡相溶解,微米级的含Cr和Mn的短棒状相和α-(AlMnFeSi)夹杂相仍然保留下来,时效过程中过饱和固溶体分解析出主要强化相β″相。合金棒材适宜的固溶-时效制度为545℃×50 min固溶水淬,170℃×8 h时效,在此条件下,合金棒材的抗拉强度、屈服强度和伸长率分别为367 MPa、341 MPa和14.1%。
关键词(KeyWords): Al-Mg-Si合金;固溶;时效;组织性能;电导率
基金项目(Foundation): 广东省-教育部产学研结合项目(2009A080205001)
作者(Author): 商宝川,尹志民,周向,黄志其
DOI: 10.13289/j.issn.1009-6264.2011.01.015
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