Microstructure and mechanical properties of Ti-6Al-4V/Ti-22Al-25Nb joint formed by diffusion bonding

被引：0
|
作者：
LIN P. [1 ,2 ]
XI X.-Z. [1 ]
ZHAO W.-K. [1 ]
YANG R.-H. [1 ]
LIN F. [1 ]
CUI X.-L. [2 ]
LIU G. [2 ]
机构：
[1] College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan
[2] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin
来源：
Transactions of Nonferrous Metals Society of China (English Edition) | 2021年 / 31卷 / 05期
基金：
中国国家自然科学基金;
关键词：
diffusion bonding; diffusion layer; interface; Ti-22Al-25Nb; Ti-6Al-4V;
D O I：
10.1016/S1003-6326(21)65581-4
中图分类号：
学科分类号：
摘要：
Ti-6Al-4V (wt.%) and Ti-22Al-25Nb (at.%) were joined by diffusion bonding at 950 °C and 15 MPa for 100 min, and the microstructure and mechanical properties of the resulting joints were investigated. The composition of the diffusion layer is B2/discontinuous α/α2 layer/necklace-shaped β+α′ layer, where the content of any element at a given point mainly depends on the distance of the point from the interface and the phase type at the point. The tensile strength of the joint is 894 MPa, which is almost the same as that of the Ti-22Al-25Nb base alloy. The fracture surfaces on both sides of the joint are composed of two main regions. One region displays a relatively flat surface and fractures along the bonding interface. The other is composed of a moderate number of irregularly-shaped cavities on the Ti-6Al-4V side and many irregularly-shaped bulges on the Ti-22Al-25Nb side. Both regions result from fracture along the boundaries between β+α′ layers and αp grains or from the transcrystalline fracture of αp grains. © 2021 The Nonferrous Metals Society of China
引用
收藏
页码：1339 / 1349
页数：10
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