Dynamic mechanisms of strengthening and softening of coherent twin boundary via dislocation pile-up and cross-slip

Zhipeng Li; Jianfei Zhang; Yadi Zhai; Jiabao Zhang; Xiaodong Wang; Ze Zhang; Shengcheng Mao; Xiaodong Han

doi:10.1080/21663831.2022.2065892

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Dynamic mechanisms of strengthening and softening of coherent twin boundary via dislocation pile-up and cross-slip

Original Reports | 更新时间：2026-08-19

- Dynamic mechanisms of strengthening and softening of coherent twin boundary via dislocation pile-up and cross-slip
- Materials Research Letters Vol. 10, Issue 8, Pages: 539-546(2022)
- 作者机构：
  
  1. a Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of Technology
  2. c School of Police Equipment and Technology China People’s Police University
  3. a Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of Technology Beijing People’s Republic of China
  4. b State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering Zhejiang University
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2022.2065892
  CLC：
- Online First：21 April 2022，
  
  Published：2022
- 稿件说明：
移动端阅览
Zhipeng Li, Jianfei Zhang, Yadi Zhai, et al. Dynamic mechanisms of strengthening and softening of coherent twin boundary via dislocation pile-up and cross-slip[J]. Materials Research Letters, 2022, 10(8): 539-546.
DOI：

Zhipeng Li, Jianfei Zhang, Yadi Zhai, et al. Dynamic mechanisms of strengthening and softening of coherent twin boundary via dislocation pile-up and cross-slip[J]. Materials Research Letters, 2022, 10(8): 539-546. DOI： 10.1080/21663831.2022.2065892.

摘要

Abstract

lthough cross-slip strongly affects the deformation of polycrystalline materials

the phenomenon is rarely studied in twinned face centered cubic (FCC) metals. Here we performed in-situ TEM nanoindentation on a twinned nickel bi-crystal. Multiple pile-ups were generated

with the first dislocations pinned at a coherent twin boundary (CTB) and multiple following dislocations cross-slipping within the matrix. Stress calculation revealed that the cross-slip events are made possible by the CTB

the first dislocations

and the favorable shear stress created jointly by external stress and dislocation interaction. These cross-slip events reduce tip stress and soften the material until inter-grain plasticity is eventually activated.

IMPACT STATEMENT

In-situ TEM nanoindentation reveals the characteristics of dislocation pinning

pile-ups and cross-slip along the twinning boundary in a twinned FCC metal for the first time.

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