首页|Ti?6Al?4V/Ti?22Al?25Nb扩散连接接头的显微组织和力学性能

Ti?6Al?4V/Ti?22Al?25Nb扩散连接接头的显微组织和力学性能

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在950℃、15 MPa和100 min条件下对Ti−6Al−4V(质量分数,％)和Ti−22Al−25Nb(摩尔分数,％)合金进行扩散连接,并对接头的显微组织和力学性能进行研究.扩散层由B2相层、α/α2相层和项链状的β+α′相层组成.扩散层某一点的成分取决于该点到界面的距离和该点所处的相的类型.接头的抗拉强度为894 MPa,和Ti−22Al−25Nb基体的强度相当.接头断面由两类区域组成:一类区域为相对较平的断面,沿界面发生断裂;另一类为Ti−6Al−4V端形状不规则的空洞和Ti−22Al−25Nb端形状不规则的凸起.这两类区域均为沿β+α′相层和αp相晶粒的界面断裂或为αp相晶粒的穿晶断裂.
Microstructure and mechanical properties of Ti−6Al−4V/Ti−22Al−25Nb joint formed by diffusion bonding
Ti−6Al−4V (wt.％) and Ti−22Al−25Nb (at.％) were joined by diffusion bonding at 950 ℃ 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 betweenβ+α′layers andαp grains or from the transcrystalline fracture ofαp grains.

diffusion bondingTi−6Al−4VTi−22Al−25Nbinterfacediffusion layer

林鹏、席先铮、赵文凯、杨蕊红、林飞、崔晓磊、刘钢

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太原理工大学 材料科学与工程学院,太原 030024

哈尔滨工业大学 先进焊接与连接国家重点实验室,哈尔滨 150001

扩散连接 Ti−6Al−4V Ti−22Al−25Nb 界面 扩散层

National Natural Science Foundation of ChinaState Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,China

51505323AWJ-17M-04

2021

10.1016/S1003-6326(21)65581-4

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(5)
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