Post-bonded compressive behavior and processing map of TiAl/Ti2AlNb joint along the bonding interface based on a composite model

Lei Zhu, Bin Tang, Beibei Wei, Mingxuan Ding, Yan Liu, Guoming Zheng, Jinshan Li

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Post-bonded compression of TiAl/Ti2AlNb joint was conducted between deformation temperatures 950 °C and 1050 °C, with the strain rate range of 0.001 s−1–0.0001 s−1 and the height reduction of 50% in the present work. And the hot deformation behavior of the joint was investigated based on an analysis of the strain-stress curve, Arrhenius constitutive equation and processing map. The Arrhenius relationship (AR) and the parallel Arrhenius relationship (PAR) were established to describe the flow stress as a function of the strain rates and deformation temperatures. As a consequence, the average error between the AR and the PAR was only 1.1%, showing that the bonding interface has a feeble influence on the hot compression process of the joint. Moreover, an optimized processing map of the joint was constructed by overlaying the macro-instability map on the interfacial microstructure control region. The stability region of the joint was defined to this domain with the deformation temperature higher than 1050 °C and the strain rate lower than 0.0005 s−1. On balance, this work can be used to not only improve the hot working ability of the joint but also develop the interfacial microstructure of the joint.

Original languageEnglish
Article number124915
JournalMaterials Chemistry and Physics
Volume271
DOIs
StatePublished - 1 Oct 2021

Keywords

  • Composite model
  • Flow stress
  • Post-bonded compression
  • Processing map
  • TiAl/TiAlNb joint

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