Corrosion resistance of aluminum alloy AA7022 wire fabricated by friction stir extrusion  

搅拌摩擦挤压AA7022铝合金线材的耐腐蚀性能（英文）

作　　者：Kamin TAHMASBI Masoud MAHMOODI Hossein TAVAKOLI 

机构地区：[1]Department of Mechanical Engineering, Semnan University, Semnan 3513119111, Iran [2]Faculty of Materials & Metallurgical Engineering, Semnan University, Semnan 3513119111, Iran

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第8期1601-1609,共9页中国有色金属学报（英文版）

摘　　要：Friction stir extrusion(FSE)is known as an innovative manufacturing technology that makes it possible to directly produce wire via consolidation and extrusion of metal chips or solid billets.In this study,wire samples were produced using aluminum alloy AA7022 machining chips by the use of the FSE.To this end,the microstructures and mechanical properties of the base material(BM)and the extruded samples were investigated.The corrosion resistance of the given samples was also determined using potentiodynamic polarization technique.The results showed that the samples manufactured at higher rotational speeds possessed good surface quality,the process temperature and the grain size similarly increased following the rise in rotational speed,and the mechanical properties consequently decreased.Using the FSE led to crystallite refinement,increase in volume fraction of grain boundaries,as well as re-distribution of precipitates affecting corrosion resistance.Furthermore,the findings of the corrosion tests revealed that the produced samples by the FSE had adequate corrosion resistance and the growth in die rotation rate augmented current density and subsequently reduced corrosion resistance.搅拌摩擦挤压(FSE)是一种新型制造技术,它使得通过金属片或实心坯的固结和挤压直接生产线材成为可能。本文作者采用搅拌摩擦挤压法将AA7022铝合金切屑制备成线材,研究基材和挤压后样品的显微组织和力学性能。用动电位极化曲线法测试样品的耐腐蚀性能。结果表明,在较高转速下制备的试样其表面质量较好。随着转速的增加,样品的加工温度升高,晶粒尺寸增大,而力学性能下降。使用FSE可使晶粒细化、晶界的体积分数提高以及使影响合金耐腐蚀性能的析出相进行再分布。此外,腐蚀试验结果表明,采用FSE法制备的试样具有足够的耐腐蚀性能,但在较高模具转速下制备的样品其腐蚀电流密度增加,耐腐蚀性能下降。

关 键 词：friction stir extrusion aluminum alloy wire grain size HARDNESS corrosion resistance 

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