Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第5期    总第254期    2020年5月

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文章编号:1004-0609(2020)-05-1065-08
Ni中间层超声辅助瞬间液相扩散连接镁合金机制
李一楠1,杨乘飞1,闫久春2,彭子龙1

(1. 青岛理工大学 机械与汽车工程学院,青岛 266520;
2. 哈尔滨工业大学 先进焊接及连接国家重点实验室,哈尔滨 150001
)

摘 要: 为了研究超声作用时间对镁合金连接接头显微组织与力学性能的影响,以纯镍中间层对MB8镁合金进行超声辅助瞬间液相扩散焊(U-TLP)。结果表明:在520?℃时超声作用10?s即可去除母材表面氧化膜。随着超声作用时间的延长,Ni箔与母材Mg发生共晶反应,并逐渐被消耗,α-Mg+Mg2Ni共晶产物开始先增多,而后在超声头压力和声流作用下被逐渐挤出。超声作用30?s时,由于易使接头变脆的Mg2Ni被挤出,钎缝主要以α-Mg(Ni)为主,此时接头剪切强度达到最大(107?MPa),达到母材强度的102%,断裂位置为钎缝中反应生成的α-Mg固溶体区域。

 

关键字: 镁合金;超声辅助;瞬间液相扩散连接;微观组织;力学性能

Mechanism of ultrasound-assisted transient liquid phase bonding of magnesium alloy with Ni interlayer
LI Yi-nan1, YANG Cheng-fei1, YAN Jiu-chun2, PENG Zi-long1

1. School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China;
2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

Abstract:In order to research the effect of ultrasonic processing time on the microstructures and mechanical properties of magnesium alloy joint, ultrasonic-assisted transient liquid phase bonding (U-TLP) of MB8 magnesium alloy was carried out with a pure nickel interlayer. The results show that the oxide film on the surface of Mg alloy is successfully removed at 520 ℃ within ultrasonic processing time of 10?s. With the prolongation of the ultrasonic processing time, a eutectic reaction between Ni foil and Mg base metal proceeds and the Ni foil is consumed gradually. The α-Mg+Mg2Ni eutectic products begin to increase at first and then are extruded under the static pressure of sonotrode and ultrasonic sound flow effect. When the ultrasonic processing time is 30?s, as the Mg2Ni which is easy to make the joint brittle is extruded, the brazing seam is mainly composed of magnesium-based solid solution. At this time, the joint shear strength increases to the maximum of 107?MPa, reaching 102% of that of the base metal, and the fracture is along the α-Mg solid solution in brazing seam.

 

Key words: magnesium alloy; ultrasonic assistance; transient liquid phase bonding; microstructure; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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