Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K

Xiyao Li; Qingkun Zhao; Qiannan Wang; Yanzhong Tian; Haofei Zhou; Jiangwei Wang

doi:10.1080/21663831.2021.1992523

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Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K

Original Report | 更新时间：2026-08-19

- Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K
- Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K
- 材料研究快报（英文） 2021年9卷第12期页码：523-530
- 作者机构：
  
  1. a Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University
  2. b Center for X-Mechanics Department of Engineering Mechanics Zhejiang University
  3. c Laboratory for Shock Wave and Detonation Physics Institute of Fluid Physics China Academy of Engineering Physics
  4. d Key Laboratory for Anisotropy and Texture of Materials Ministry of Education School of Materials Science and Engineering Northeastern University
  5. a Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou People’s Republic of China
  6. e Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials Institute of Wenzhou Zhejiang University
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2021.1992523
  中图分类号：
- 网络首发：2021-10-26，
  
  纸质出版：2021
- 稿件说明：
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Xiyao Li, Qingkun Zhao, Qiannan Wang, 等. Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K[J]. 材料研究快报（英文）, 2021,9(12):523-530.

Xiyao Li, Qingkun Zhao, Qiannan Wang, et al. Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K[J]. Materials Research Letters, 2021, 9(12): 523-530.
Xiyao Li, Qingkun Zhao, Qiannan Wang, 等. Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K[J]. 材料研究快报（英文）, 2021,9(12):523-530. DOI： 10.1080/21663831.2021.1992523.

Xiyao Li, Qingkun Zhao, Qiannan Wang, et al. Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K[J]. Materials Research Letters, 2021, 9(12): 523-530. DOI： 10.1080/21663831.2021.1992523.

摘要

Abstract

Phase transformation is rare in pure body-centered cubic (BCC) metals due to the associated high energy barrier. Here

omega (ω) phase transformation in single-crystal niobium (Nb) under compression at 77 K was studied by atomistic characterization and density functional theory (DFT) calculation. The ω phases were found to nucleate preferentially at the boundaries of 112 shear bands

via a sequence of BCC-to-ω structural transformation induced by shear stress. Theoretically

calculations reveal that the formation of a shear transition region can reduce the energy barrier of BCC-to-ω phase transformation. These findings provide insights into the phase transformation involved in the cryogenic deformation of bulk BCC metals.

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