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research-article

Modeling of solid state hot press bonding and its application to the fabrication of titanium alloy joint

[+] Author and Article Information
Chao Zhang

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072 Xi,an, P.R. China; Department of Mechanical Engineering, Lyon University/INSA-Lyon/CNRS, F-69621 Villeurbanne, Cedex, France
zc9997242256@126.com

Hong Li

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072 Xi,an, P.R. China
lihong86@nwpu.edu.cn

Miaoquan Li

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072 Xi,an, P.R. China
honeymli@nwpu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040262 History: Received July 03, 2017; Revised May 09, 2018

Abstract

Solid-state hot press bonding has been widely used to manufacture components with complex internal structures in a single-step. Compared with conventional forming and shaping methods, significant cost reductions can result from material saving and reduced tooling costs by using this advanced joining technology. The residual interfacial voids degrade the performance of the joint. In this study, a three-dimensional theoretical model for predicting the void closure process in hot press bonding is developed based on four mechanisms acting on void closure. In the model, the void closure process is divided into two stages: in the first stage, surface asperities are flattened by instantaneous local plastic flow mechanism and isolated voids form in the bonding interface; in the second stage, the void closure is operated by the combination of viscoplastic flow mechanism, surface source diffusion mechanism and interface source diffusion mechanism. Initial and ending conditions of these void closure mechanisms are analyzed in detail. Also included in the model is an analysis of the influence of macroscopic deformation of the joined specimen on void closure. In addition, a number of hot press bonding experiments of Ti-6Al-4V alloy are conducted to validate the accuracy of this model, and the experimental results are in a favorable agreement with the predictions from this new model.

Copyright (c) 2018 by ASME
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