AC8C铸造铝合金的组织缺陷分析  

Analysis on microstructure defects of AC8C aluminum cast alloy

作　　者：吴旻[1] 邹兴政[2] 陈东[2] 

机构地区：[1]重庆工业职业技术学院,重庆401120 [2]重庆材料研究院,重庆400707

出　　处：《金属热处理》2013年第6期123-125,共3页Heat Treatment of Metals

摘　　要：采用化学成分分析、断口扫描、金相检验、硬度测试等方法,对AC8C铸造铝合金内燃机活塞断裂原因进行了分析。结果表明,活塞显微组织中α-固溶体粗大、共晶硅和Al2Cu相聚集,导致合金力学性能降低,使共晶硅和Al2Cu相集中分布的区域发生早期脆性断裂。铸造和固溶时效处理工艺不当是造成铝合金组织缺陷的原因。Fracture failure of internal combustion engine piston manufactured by AC8C aluminum cast alloy was analysed by chemical component analysis, fracture scanning, metallographic and hardness test. The results show that there are coarsed or-solid solution, and clumped distributed eutectic silicon and AI2Cu phase in mierostrncture, which result in the decrease of the mechanical properties of aluminum alloy, and the early brittle fracture of the piston. Unreasonable casting and solid solution aging treatment result in structure defects.

关 键 词：AC8C铸造铝合金 组织缺陷 断裂 

分 类 号：TG157[金属学及工艺—热处理]