Enhancing {$10\bar{1}2$} twin boundary migration capability in Ti-Al solid solution alloys with increasing Al content

doi:10.1016/j.jmst.2022.10.080

J. Mater. Sci. Technol. ›› 2023, Vol. 147: 217-223.DOI: 10.1016/j.jmst.2022.10.080

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Enhancing {$10\bar{1}2$} twin boundary migration capability in Ti-Al solid solution alloys with increasing Al content

Hao Zhang^a, Bingqiang Wei^a, Xiaoqin Ou^a, Song Ni^a, Xiaozhou Liao^b, Min Song^a,*

^aState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
^bSchool of Aerospace, Mechanical & Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia

Received:2022-08-05 Revised:2022-09-20 Accepted:2022-10-14 Published:2023-06-01 Online:2022-12-30
Contact: * E-mail address: msong@csu.edu.cn (M. Song)

Abstract

Abstract: The migration mechanism of {$10\bar{1}2$} twin boundaries (TBs) in pure Ti and Ti-Al solid solution alloys, and the effect of the Al addition for pure Ti and Al concentration for Ti-Al solid solution alloys on {$10\bar{1}2$} TB migration are investigated. Both molecular dynamics simulations and experimental results indicate that the migration of {$10\bar{1}2$} TBs is caused by the glide of twinning dislocations (TDs) in both pure Ti and Ti-Al solid solution alloys. The addition of Al promotes the nucleation of TDs on TBs, resulting in the decrease of the critical resolved shear stress for nucleation of TDs with increasing the Al content. This is because the addition of Al atoms causes lattice distortion and increases the energies of the Ti atoms around the Al atoms, resulting in the formation of high-energy regions that facilitate the nucleation of TDs at TBs.

Key words: Ti-Al solid solution alloys, {$10\bar{1}2$} twin, Twin boundary migration, Twinning dislocation

Hao Zhang, Bingqiang Wei, Xiaoqin Ou, Song Ni, Xiaozhou Liao, Min Song. Enhancing {$10\bar{1}2$} twin boundary migration capability in Ti-Al solid solution alloys with increasing Al content[J]. J. Mater. Sci. Technol., 2023, 147: 217-223.

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Enhancing {$10\bar{1}2$} twin boundary migration capability in Ti-Al solid solution alloys with increasing Al content

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