Effects of pure Ti or Zr powder on microstructure and mechanical properties of Ti6Al4V and Ti2AlNb joints brazed with TiZrCuNi

被引：30
作者：
Yuan, L. [1 ,2 ]
Xiong, J. T. [1 ,2 ]
Du, Y. J. [2 ]
Wang, Y. [2 ]
Shi, J. M. [2 ]
Li, J. L. [2 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Shaanxi Key Lab Frict Welding Technol, Xian 710072, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 788卷
基金：
中国国家自然科学基金;
关键词：
Ti6Al4V alloy; Ti2AlNb alloy; Brazing; Microstructure evolution; Mechanical properties; CU-NI; EVOLUTION; TI-6AL-4V; ALLOY; STRENGTH; TITANIUM; METAL;
D O I：
10.1016/j.msea.2020.139602
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ti6Al4V and Ti2AlNb alloys were brazed with three kinds of filler metals, typical commercial filler of TiZrCuNi, TiZrCuNi mixed with Ti or Zr powder. The microstructure evolution, production and growth mechanisms of reaction phases and mechanical properties of the brazing joints were investigated. The results demonstrated that primary dendrites formed by IMCs (Ti,Zr)2(Cu,Ni) and a layer of eutectic beta+(Ti, Zr)2(Cu, Ni) products were observed in the TiZrCuNi joint. And the number of IMCs significantly in the joint increased when Zr powder was added in the filler. But if the addition was Ti powder, IMCs can be eliminated a lot. The suppression of ICMs production in the TiZrCuNi thorn Ti joint was mainly due to two reasons: firstly, the more beta phase were firstly formed in the molten filler as the solid solubilities of Cu or Ni in Ti was higher than those in Zr; secondly, owing to the increased melting point of filler by adding the Ti powder, the time spent on the solidification of liquid filler can shorten and the segregation of Cu/Ni then partially repressed. Resulted from the efficient suppression of the detrimental IMCs, the highest tensile strength of 738.7 MPa was obtained by TiZrCuNi thorn Ti joint, which was higher than those of the TiZrCuNi joint (similar to 136.1 MPa) and TiZrCuNi thorn Zr joint (similar to 200.1 MPa).
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页数：8
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