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Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates
Chen, Wei; Cao, Shuo; Kou, Wenjuan; Zhang, Jinyu; Wang, Yue; Zha, You; Pan, Yan; Hu, Qingmiao; Sun, Qiaoyan; Sun, Jun
2019-05-15
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume170Pages:187-204
AbstractThe ductile-to-brittle transition is commonly observed in metastable beta-titanium (Ti) alloys containing omega-precipitates, while the fundamental understanding on omega-embrittlement hitherto remains elusive. In this work, the prototypical Ti-20 wt% Mo metastable beta-Ti alloy has been systematically investigated by coupling experiments and first-principles calculation to eliminate this puzzle. It is shown that the structural evolution of omega-phase controls the deformation mechanism transition of twinning-to-slip in Ti Mo alloy, being the origin of ductile-to-brittle transition of this alloy. The initial trigonal omega-structure continuously collapses to hexagonal omega-structure (structural collapse) whilst Mo-atoms are rejected out concurrently (stoichiometric varieties), both leading to hardening of omega-precipitates. This self-hardening of omega-precipitates was further rationalized in terms of the enhanced propensity for a covalent character of the atomic bond demonstrated by the electronic density of states (DOS) from first-principles calculation. Specifically, the self-hardening behavior of omega-precipitates promotes dislocation slip on isolated planes in lieu of correlative slip on successive planes inside omega 1-variant, while dislocations are completely blocked ahead omega 2/omega 3/omega 4-variants. This in turn renders the transition from deformation twinning that contributes to great macro-plasticity to ordinary dislocation slip that contributes to localized deformation bands in the present Ti-Mo alloy. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keywordbeta-titanium alloys omega-precipitates Embrittlement Dislocations First-principles calculation
Indexed BySCI
Language英语
WOS IDWOS:000466252400017
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81093
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Chen, Wei,Cao, Shuo,Kou, Wenjuan,et al. Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates[J]. ACTA MATERIALIA,2019,170:187-204.
APA Chen, Wei.,Cao, Shuo.,Kou, Wenjuan.,Zhang, Jinyu.,Wang, Yue.,...&Sun, Jun.(2019).Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates.ACTA MATERIALIA,170,187-204.
MLA Chen, Wei,et al."Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates".ACTA MATERIALIA 170(2019):187-204.
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