Journal
MATERIALS & DESIGN
Volume 219, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2022.110816
Keywords
Twin boundary; In situ TEM tensile test; Tensile elongation; Dislocation
Categories
Funding
- National Natural Science Foundation of China [51988101]
- NSFC programs [52071003, 91860202, 11604006]
- Beijing Nova Program [Z211100002121170]
- Beijing Municipal Education Commission Project [PXM2020_014204_000021, PXM2019_014204_ 500032]
- Beijing Outstanding Young Scientists Projects [BJJWZYJH01201910005018]
- Beijing Natural Science Foundation [Z180014]
- 111project [DB18015]
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This study conducted tensile experiments on Ni single-crystal samples with different TB orientations using an in situ tensile stage in a transmission electron microscope. The results revealed a significant influence of TB orientation on the ductility of the materials, with the perpendicular TB sample exhibiting the highest elongation.
The construction of twin boundaries (TBs) in materials is a remarkable way of promoting their strength and ductility. However, the effects of TB orientation on the mechanical properties have not been reported experimentally so far. Using a state-of-the-art in situ tensile stage equipped in a transmission electron microscope, uniaxial tensile tests were performed on three single-crystalline Ni samples with TB parallel and perpendicular to the tensile direction and no TB. The results showed that the uniform tensile elongation strongly depends on TB, 120% for the perpendicular TB sample, 99% for the parallel TB sample, and only 55% for the no TB sample. In addition, dislocation interaction before reaching the perpendicular CTB contribute to cross-slip and dynamic formation of dislocation jogs, thereby improving strain hardening and resulting in a large uniform tensile elongation. (c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-NDlicense (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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