Improving friction stir weldability of Al/Mg alloys via ultrasonically diminishing pin adhesion  

作　　者：Xiangchen Meng Yanye Jin Shude Ji Dejun Yan 

机构地区：[1]Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China [2]Department of Industrialization & Informatization, Shenyang North Software Institute, Shenyang 110000, China [3]Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships, CSSC Huangpu Wenchong Shipbuilding Company Limited, Guangzhou510715, China

出　　处：《Journal of Materials Science & Technology》2018年第10期1817-1822,共6页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51204111);the Program for Liaoning Excellent Talents in University(No.LJQ2015084);the China Postdoctoral Science Foundation(No.2016M590821);Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships(No.2017B030302010)

摘　　要：Formation of intermetallic compounds （IMCs） during friction stir welding （FSW） of alu- minum/magnesium （AI/Mg） alloys easily results in the pin adhesion and then deteriorates joint formation. The severe pin adhesion transformed the tapered-and-screwed pin into a tapered pin at a low welding speed of 30 mm/min. The pin adhesion problem was solved with the help of ultrasonic. The weldability of Al/Mg alloys was significantly improved due to the good material flow induced by mechanical vibration and the fragments of the IMCs on the surface of a rotating pin caused by acoustic streaming, respectively. A sound joint with ultrasonic contained long Al/Mg interface joining length and complex mixture of AI/Mg alloys in the stir zone, thereby achieving perfect metallurgical bonding and mechanical interlocking. The ultrasonic could broaden process window and then improve tensile properties. The tensile strength of the Al/Mg joint with ultrasonic reached 115 MPa.Formation of intermetallic compounds （IMCs） during friction stir welding （FSW） of alu- minum/magnesium （AI/Mg） alloys easily results in the pin adhesion and then deteriorates joint formation. The severe pin adhesion transformed the tapered-and-screwed pin into a tapered pin at a low welding speed of 30 mm/min. The pin adhesion problem was solved with the help of ultrasonic. The weldability of Al/Mg alloys was significantly improved due to the good material flow induced by mechanical vibration and the fragments of the IMCs on the surface of a rotating pin caused by acoustic streaming, respectively. A sound joint with ultrasonic contained long Al/Mg interface joining length and complex mixture of AI/Mg alloys in the stir zone, thereby achieving perfect metallurgical bonding and mechanical interlocking. The ultrasonic could broaden process window and then improve tensile properties. The tensile strength of the Al/Mg joint with ultrasonic reached 115 MPa.

关 键 词：Friction stir welding Ultrasonic Aluminum/magnesium alloys Pin adhesion Intermetallic compounds Stationary shoulder 

分 类 号：TG453.9[金属学及工艺—焊接]