固溶时效处理对ZL108铝合金冲击性能的影响  

Effect of solution and aging treatment on impact properties of ZL108 aluminum alloy

作　　者：谭国寅 Tan Guoyin(Kunming Metallurgical Research Institute Co.,Ltd.,Kunming Yunnan 650031,China)

机构地区：[1]昆明冶金研究院有限公司,云南昆明650031

出　　处：《金属热处理》2023年第5期291-293,共3页Heat Treatment of Metals

基　　金：云南省重点研发计划(202103AA080011)。

摘　　要：采用光学显微镜、扫描电镜和冲击试验机研究了固溶时效处理后ZL108铝合金的冲击性能变化。结果表明,铸态组织主要由α固溶体和粗大的共晶硅组织及块状的初晶硅组成。经过固溶时效处理后析出相变得细小且分布均匀,形貌类似短棒状或者珊瑚状,能更好地钉扎位错,有助于材料冲击性能的提升。铸态试样中由元素不平衡分配导致产生了大量的难熔共晶硅和块状初晶硅。经固溶时效处理后析出相粒子在高温作用下不断破碎,大部分已重溶进入基体,残存的析出相粒子尺寸更为细小,能够更好地协调基体形变,将试样的冲击性能提升了6.6倍。Impact properties of the ZL108 aluminum alloy after solution aging treatment were studied by means of OM,SEM and impact testing machine.The results show that the as-cast microstructure is mainly composed ofαsolid solution,coarse eutectic silicon and bulk primary silicon.After solution and aging treatment,the precipitated phase is fine and evenly distributed,with a morphology similar to short rod or coral shaped,which can better pin dislocations and help improve the impact properties of the material.The non-equilibrium distribution of elements in the as-cast specimens results in the production of a large amount of refractory eutectic silicon and bulk primary silicon.After solution and aging treatment,the precipitated phase particles continue to break under high temperature,and most of them are remelted into the matrix.The remaining precipitate particles have smaller sizes,which can better coordinate the deformation of the matrix and improve the impact properties of the specimen by 6.6 times.

关 键 词：固溶时效处理 共晶硅 冲击性能 析出相粒子 

分 类 号：TG166.3[金属学及工艺—热处理]