转速对Al/Mg异种合金超声-静止轴肩辅助搅拌摩擦焊接头的影响  

Influence of Rotational Velocity on Al/Mg Ultrasonic-stationary Shoulder Assisted Friction Stir Welding Joint

作　　者：史学海 王留芳 李登常 吕赞[2] SHI Xuehai;WANG Liufang;LI Dengchang;LYU Zan(CRRC Sifang Co.,Ltd.,Qingdao 266111,China;School of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]中车四方车辆有限公司,山东青岛266111 [2]沈阳航空航天大学航空宇航学院,辽宁沈阳110136

出　　处：《热加工工艺》2021年第7期57-60,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51705339)。

摘　　要：采用超声-静止轴肩辅助搅拌摩擦焊技术对3 mm厚6061-T6铝合金和AZ31B镁合金进行焊接,并研究转速对接头成形、显微组织和拉伸性能的影响。结果表明,焊核中存在大量铝/镁合金混合后形成的夹层状组织,随着转速的升高,夹层组织先细化后又出现增大趋势。铝/镁界面形成的复杂互锁结构可延长界面连接长度,界面互锁程度随转速增大而提高。接头拉伸强度随着转速的增大呈现先上升后下降的趋势,并在1000 r/min转速下达到最大值131 MPa。6061-T6 Al alloy and AZ31 B Mg alloy with the thickness of 3 mm were welded by ultrasonic-stationary shoulder assisted friction stir welding. The influences of rotational velocity on the joint formation, microstructure and tensile strength were mainly investigated. The results indicate that many intercalated interlayers form in SZ(stir zone) due to the mixture of Al/Mg alloys and the microstructure of the interlayers is first refined and then coarsens with the increase of rotational velocity. An interlocking structure forms at the Al/Mg interface, which increases the bonding length of intertface.The interlocking degree increases with the increase of rotational velocity. The tensile strength of the joint first increases and then decreases with the increase of rotational velocity and the maximum value of 131 MPa is acquired under the rotational velocity of 1000 r/min.

关 键 词：超声-静止轴肩辅助搅拌摩擦焊 Al/Mg异种合金 转速 显微组织 拉伸性能 

分 类 号：TG453.9[金属学及工艺—焊接]