Dissimilar friction stir welding of 6061 aluminum alloy and AZ31 magnesium alloy assisted with ultrasonic
Dissimilar friction stir welding of 6061 aluminum alloy and AZ31 magnesium alloy assisted with ultrasonic
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DOI：
10.1016/j.matlet.2017.05.011
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发表时间：
2017-08-15
影响因子：
3
通讯作者：
Li, Zhengwei
中科院分区：
文献类型：
--
作者：
Ji, Shude;Meng, Xiangchen;Li, Zhengwei
搅拌摩擦焊过程中Al/Mg合金界面形成简单的界面连接和连续的金属间化合物(IMCs)层，都会降低力学性能。在固定肩部的基础上，利用超声波辅助6061-T6和AZ31B合金的搅拌摩擦焊，以增加熔核区Al/Mg合金的界面连接长度和混合度。在静止肩部和超声波的共同作用下，获得了表面光滑的良好接头。超声波有利于提高Al/Mg合金的材料流动性、界面连接长度和混合度，改善机械联锁。加入超声波后，接头的抗拉强度和延伸率分别达到120 Mpa和1.5%，均高于未加超声波的接头。此外，局部断口形貌由一些韧窝组成，呈现包含脆性和韧性断口的混合断口。(C)2017爱思唯尔B.V.保留所有权利。
Both simple interface joining and continuous intermetallic compounds (IMCs) layer formed at the interface of Al/Mg alloys during friction stir welding (FSW) deteriorates mechanical property. Based on stationary shoulder, ultrasonic was employed to assist FSW of 6061-T6 and AZ31B alloys to increase interface joining length and mixture degree of Al/Mg alloys at nugget zone (NZ). Sound joint with smooth surface is obtained, resulting from the combined effect of stationary shoulder and ultrasonic. Ultrasonic are beneficial to increasing material flow, interface joining length and mixture degree of Al/Mg alloys, improving mechanical interlocking. The tensile strength and elongation of joint with ultrasonic reach 120 MPa and 1.5%, which are higher than that without ultrasonic. Additionally, local fracture surface morphology consists of some dimples, presenting mixed fracture containing brittle and ductile fractures. (C) 2017 Elsevier B.V. All rights reserved.