不同时效制度对7075铝合金组织及抗应力腐蚀性能的影响Effect of different aging treatments on microstructure and stress corrosion cracking resistance of 7075 aluminum alloy
齐跃,郗建豪,林忠亮,贾晓娇,张晓斌,余传魁
摘要(Abstract):
结合回归再时效(RRA)以及分级时效两种方法,利用二者的优点,探究不同热处理制度对7075铝合金组织结构及其抗应力腐蚀性能的影响。采用光学显微镜、显微硬度仪以及扫描电镜等分析方法研究了不同时效热处理后7075铝合金组织的变化。按照ASTM G44-99应力腐蚀实验标准,对相同方法加工制造的7075铝合金螺母进行应力腐蚀实验。结果表明,经过"RRA+分级时效"的7075铝合金会获得更加均匀、细密的显微组织;而经过"回归+分级时效"处理的铝合金,在保持一定高强度的情况下,获得了更好的抗应力腐蚀性能。
关键词(KeyWords): 7075铝合金;RRA+分级时效;回归+分级时效;析出相;抗应力腐蚀性能
基金项目(Foundation):
作者(Author): 齐跃,郗建豪,林忠亮,贾晓娇,张晓斌,余传魁
DOI: 10.13289/j.issn.1009-6264.2018-0305
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