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Dynamic mechanisms of strengthening and softening of coherent twin boundary via dislocation pile-up and cross-slip
- Source :
- Materials Research Letters, Vol 10, Iss 8, Pp 539-546 (2022)
- Publication Year :
- 2022
- Publisher :
- Taylor & Francis Group, 2022.
-
Abstract
- Although 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 STATEMENTIn-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.
Details
- Language :
- English
- ISSN :
- 21663831
- Volume :
- 10
- Issue :
- 8
- Database :
- Directory of Open Access Journals
- Journal :
- Materials Research Letters
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.17fc55e715074f3c9f1ae638a6fc0bc5
- Document Type :
- article
- Full Text :
- https://doi.org/10.1080/21663831.2022.2065892