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题名: In situ scanning and transmission electron microscopy investigation on plastic deformation in a metastable beta titanium alloy
作者: Yao, Tingting;  Du, Kui;  Wang, Haoliang;  Huang, Zhiye;  Li, Cuihong;  Li, Linlin;  Hao, Yulin;  Yang, Rui;  Ye, Hengqiang
发表日期: 2017-7-1
摘要: Martensitic transformation and deformation twinning are investigated in Ti-24Nb-4Zr-8Sn (wt. %) alloy with in situ tensile deformation in scanning and transmission electron microscopes. Deformation induced beta to alpha'' martensitic transformation occurs at a stress plateau stage of similar to 200 MPa and deformation twinning takes place subsequently at later strain hardening stage. In situ transmission electron microscopy observations combined with finite element method calculation reveal that three deformation mechanisms, alpha'' martensitic transformation, {112}< 111 >beta deformation twinning and kinks of alpha" lamellae, are activated with the increase of applied stress/strain. Among them, deformation-induced 13 to a" phase transformation dominates the early-stage deformation. As the stress increasing, {112}< 111 >beta deformation twinning is activated and becomes the dominating deformation mechanism afterward. Interactions between dislocation slips and martensite/twin lamellae are likely responsible for the strain hardening. After the deformation over the ultimate tensile strength, slip bands initiate and become the major deformation mechanism during necking until fracture. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Recommended Citation:
Yao, Tingting,Du, Kui,Wang, Haoliang,et al. In Situ Scanning And Transmission Electron Microscopy Investigation On Plastic Deformation In A Metastable Beta Titanium Alloy[J]. Pergamon-elsevier Science Ltd,2017,133:21-29.

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