电解铝液制备7005铝合金的铸态组织与性能  

As-cast Microstructure and Properties of 7005 Aluminum Alloy Produced by Electrolytic Liquid-Al

作　　者：吴文祥[1] 陈琦[1] 马科[1] 邓桢桢[1] 王家淳[1] 

机构地区：[1]苏州有色金属研究院有限公司

出　　处：《特种铸造及有色合金》2008年第12期973-975,共3页Special Casting & Nonferrous Alloys

摘　　要：采用光学显微镜观察、扫描电镜观察及能谱分析、室温拉伸试验等手段研究了电解铝液中的Fe、Si、氢、Al2O3夹杂对7005铝合金铸态组织性能的影响。结果表明,电解铝液中的杂质元素Fe、Si与合金中的Mn、Mg等元素作用形成Al-FeMnSi、Mg2Si等第二相,分布于晶内以及晶界处。电解过程中生成的氢和A12O3夹杂物,是短流程工艺影响铝熔体冶金品质的主要根源。铸造过程中形成的疏松和气孔是铸态7005合金拉伸试验中断裂的原因。Effects of Fe,Si,hydrogen,Al2O3 inclusion in electrolyte liquid aluminum on as-cast microstructure and properties of 7005 aluminum alloy were investigated by means of optical microscope(OM),scanning electron microscope(SEM),energy spectrum analysis and ambient tensile testing.The results indicate that impurity elements Fe and Si can react with Mg and Mn in electrolyte liquid aluminum to form the second phase,such as AlFeMnSi and Mg2Si,which is distributed along the grain boundary or in the grain.The metallurgical quality of liquid aluminum in short-flow process is basically controlled by hydrogen and Al2O3 inclusion generated in the course of Al electrolysis.Existence of gas porosity formed during casting is responsible for fracture of the as-cast 7005 aluminum alloy.

关 键 词：7005铝合金 电解铝液 Al2O3夹杂物 

分 类 号：TG27[金属学及工艺—铸造]