7A09铝合金铸锭晶粒粗大对挤压棒材的影响  

Effect of Coarse Grain on Extrusion Bars of 7A09 Aluminum Alloy Ingot

作　　者：马小前 MAXiao-qian(Northwest Aluminum Industry Co.,Ltd.,Longxi 748111,China)

机构地区：[1]西北铝业有限责任公司

出　　处：《铝加工》2019年第5期34-37,共4页Aluminium Fabrication

摘　　要：7A09铝合金粗大晶粒铸锭与正常铸锭经挤压、淬火人工时效后,分别进行低倍组织、显微组织与力学性能对比,分析了7A09铝合金铸锭粗大晶粒对挤压后棒材的影响。结果表明,通过合理控制铝合金的化学成分、保证熔炼铸造工艺、选择相对较低的铸造温度、提高结晶速度、适当增加晶粒细化剂添加量等措施,可以避免形成粗大晶粒。The macrostructure,microstructure,mechanical property of the coarse grain ingotand normal ingot of 7A09 aluminum alloy were compared after extrusion,quenching and artificial aging.The influence of coarse grains on extruded bars of 7A09 ingot aluminum alloy was analyzed.The results show that the formation of coarse grain can be avoided reasonably by aid of chemical composition control of aluminum alloy,optimized melting casting process,low casting temperature,increasing the crystallization speed and increasing grain refiner addition.

关 键 词：7A09铝合金铸锭 晶粒粗大 挤压棒材组织 力学性能 影响 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG379[金属学及工艺—金属材料]