固溶处理工艺对改良铸造铝硅合金组织和性能的影响  

Effect of Solution Treatment Process on the Microstructure and Property of Modified Aluminum Silicon Casting Alloy

作　　者：李飞龙[1] 黄晓珍 苏广才[3] 李飞庆[1] 刘俊生[1] 汤胜博[1] 江鸿杰[1] 谢尚昇[1] 

机构地区：[1]广西南南铝加工有限公司,广西南宁530031 [2]上汽通用五菱汽车股份有限公司,广西柳州545007 [3]广西大学材料科学与工程学院,广西南宁530004

出　　处：《铝加工》2015年第1期25-29,共5页Aluminium Fabrication

基　　金：广西大学有色金属及材料加工新技术教育部重点实验室开放基金(合同编号:GXKFJ-01)

摘　　要：通过不同温度和时间的固溶制度研究了固溶处理工艺对改良铸造铝硅合金(0.35%Mg,7.0%Si,0.2%Ni,2.0%Cu,0.8%RE,0.2%Mn,0.1%V,其余为铝)组织和性能的影响。实验结果表明,在495℃×5h进行固溶处理时,改良铸造铝硅合金具有最好的综合力学性能:Rm=239MPa,硬度=103HBS,A=6.24%;改良铸造铝硅合金于495℃×5h固溶淬火析出富含Si、Cu、Ni以及RE元素的Si、Al Cu、Al6Cu3Ni、Alx Cu Ce相。这些相的存在,有利于提高合金的力学性能和高温性能。合金经过热处理后以韧性断裂为主要方式并伴有准解理面现象,拉伸断口微观形貌主要表现为韧窝断口特征,有些存在少量撕裂棱。By aid of solution system with different temperature and time, effect of solution treatment process on the microstructure and mechanical properties of modified aluminium silicon casting alloy（0.35% Mg,7.0% Si,0.2% Ni,2.0% Cu,0.8% RE,0.2% Mn,0.1% V,balance is Al）was studied. The results show that,at 495℃×5h for solution treatment,modified aluminium silicon casting alloy has the best comprehensive mechanical properties：б=239MPa,HBS=103HBS,β=6.24%;modified aluminium silicon casting alloy at 495℃×5h after solution quench had Si,Al Cu,Al6Cu3 Ni,Alx Cu Ce phases containing rich Si,Cu,Ni and RE elements. These phases were helpful to improve the mechanical properties and high temperature performance of alloy. Ductile fracture for alloy after heat treatment is the main way and is accompanied by the quasi cleavage phenomenon. The tensile fracture morphology is mainly dimple fracture characteristics, some of the presence of a small amount of tear ridges.

关 键 词：固溶处理 改良铸造铝硅合金 热处理 韧性断裂 

分 类 号：TG156.94[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]