Ultrasound-induced liquid/solid interfacial reaction between Zn-3Al alloy and Zr-based bulk metallic glasses
Ultrasound-induced liquid/solid interfacial reaction between Zn-3Al alloy and Zr-based bulk metallic glasses
复制标题
超声诱导Zn-3Al合金与Zr基大块金属玻璃之间的液/固界面反应
DOI：
10.1016/j.ultsonch.2018.03.006
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发表时间：
2018
影响因子：
8.4
通讯作者：
Li Mingyu
中科院分区：
文献类型：
--
作者：
Zhang Xingyi;Xiao Yong;Wang Qiwei;Wang Ling;Wan Chao;Sheng Hongchao;Li Mingyu
采用Zr- 3al填充金属对Zr基大块金属玻璃（Zr- bmg）接头进行了超声辅助无钎焊。研究了超声振动时间对Zr-BMG接头组织和力学性能的影响。结果表明，超声波钎焊Zr-BMG接头可获得良好的冶金结合。液态Zn-3Al填充金属与Zr-BMG衬底之间的界面反应表现出突变特征，可分为潜伏期和加速期。在孵育期间，zn50zr25al25金属间化合物（IMCs）缓慢形成，呈小椭球状分布在Zr-BMG表面。而在加速期，zn50zr25al25椭球体迅速发育为厚度为17 μm的由zn50zr25al25和Zn22Zr交替子层组成的波状结构IMCs层。Zn-3Al/Zr-BMG界面的微观结构演变是声空化和Al元素控制的界面冶金反应共同作用的结果。随着超声振动时间的增加，接头的平均抗剪强度先升高后略有降低，钎焊96 s的接头强度最高，约为100 MPa。随着超声振动时间的增加，剪切破坏倾向于发生在Zn-3Al/Zr-BMG界面，然后转移到界面IMCs层。
Ultrasound-assisted fluxless brazing of Zr based Bulk metallic glasses (Zr-BMG) joint using Zn-3Al filler metal was performed in this study. The effect of ultrasonic vibration time on the microstructure and mechanical properties of Zr-BMG joints were investigated. Results showed that excellent metallurgic bonding could be obtained in ultrasonically brazed Zr-BMG joints. The interfacial reaction between liquid Zn-3Al filler metal and Zr-BMG substrate showed a mutation characteristic, which could be distinguished into incubation period and acceleration period. In the incubation period, Zn50Zr25Al25intermetallic compounds (IMCs) with small ellipsoidal shape were slowly formed and distributed randomly on Zr-BMG surface. However, in the acceleration period, Zn50Zr25Al25ellipsoids developed rapidly into a wavy-structured IMCs layer with a thickness of 17 μm, which was comprised of alternate Zn50Zr25Al25and Zn22Zr sublayers. The microstructure evolution of Zn-3Al/Zr-BMG interface was ascribed to the combined effects of acoustic cavitations and Al element controlled interfacial metallurgic reactions. The average shear strength of joint was increased firstly then decreased slightly with increasing ultrasonic vibration time, and a highest strength value of approximately 100 MPa was obtained for joints brazed for 96 s. The shearing failure was inclined to occur at the Zn-3Al/Zr-BMG interface then transferred into the interfacial IMCs layer with increasing ultrasonic vibration time.