冷却速率与T6热处理对铸造铝合金组织和性能的影响  

Effects of Cooling Rate and T6 Heat Treatment on Microstructure and Properties of Cast Aluminum Alloy

作　　者：王玮[1] 张艳涛 孙巧妍[1] 姚彤辉 WANG Wei;ZHANG Yan-tao;SUN Qiao-yan;YAO Tong-hui(Yantai Nanshan University,Longkou 265700,Shandong,China;Longkou Conglin Aluminum Co.,Ltd.,Longkou 265700,Shandong,China)

机构地区：[1]烟台南山学院,山东龙口265700 [2]龙口市丛林铝材有限公司,山东龙口265700

出　　处：《铸造》2022年第1期34-38,共5页Foundry

摘　　要：研究了不同冷却速度下铸态与热处理后的铝合金微观组织和力学性能。结果表明:经过热处理后的铝合金组织中针状共晶硅转变为圆滑棒状,而冷却速度小的铝合金组织中硅颗粒尺寸变小;冷却速率对铝合金常温力学性能和耐腐蚀性影响不明显,而T6热处理可显著提高铝合金的常温、高温力学与耐腐蚀性能;常温拉伸试样的断口由基体中的微孔洞、撕裂棱和二次裂纹组成,随着测试温度从25℃提高到300℃,断裂特征由混合断裂转变为韧性断裂,带有韧窝和撕裂棱的微孔洞增加,二次裂纹减少。The microstructure and mechanical properties of as-cast and heat-treated aluminum alloys under different cooling rates have been studied.The results showed that the eutectic silicon in the microstructure of the aluminum alloy after heat treatment changed from needle-like to smooth rod-like,and the size of the silicon particles in the microstructure with low cooling rate decreased.The cooling rate had no obvious effect on the mechanical properties and corrosion resistance of the aluminum alloy at room temperature,while the T6 heat treatment significantly improved the mechanical properties and corrosion resistance of the aluminum alloy at room temperature and high temperature.The fracture of the tensile specimen at normal temperature consisted of micro-pores,tearing edges and secondary cracks in the matrix.With the increase of test temperature from 25℃to 300℃,the fracture characteristics changed from mixed fracture to ductile fracture,and the micropores with dimples and tearing ridges increased,while the secondary cracks decreased.

关 键 词：模具温度 热处理 微观组织 力学性能 

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