Effect of High-Pressure Torsion on the Microstructure and Wear Behavior of NiTi Alloy
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- Title
- Effect of High-Pressure Torsion on the Microstructure and Wear Behavior of NiTi Alloy
- Authors
- Farvizi, M; Akbarpour, MR; Yoon, EY; Kim, HS
- Date Issued
- 2015-09
- Publisher
- KOREAN INST METALS MATERIALS
- Abstract
- The wear property of NiTi is one of the most important properties of this alloy. In the current study, the effect of high-pressure torsion (HPT) process on the wear properties of an austenitic NiTi shape memory alloy is investigated. Full density NiTi samples with a composition of Ti-56 wt% Ni are fabricated using hot isostatic pressing (HIP), followed by the HPT process at room temperature, with an applied pressure of 6 GPa for 10 turns. The microstructural analysis reveals that the HIP-processed samples with a B2-NiTi phase evolve into significant grain refinement after HPT process and an interwoven B2-B19' nanocrystalline/amorphous structure formed, leading to increased hardness in these samples. The results of the wear tests using a ball-on-disc configuration at room temperature demonstrate that the wear performance of the samples is improved after the HPT process. This is due to greater hardness and better pseudo-elasticity in the HPT-processed samples.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/36878
- DOI
- 10.1007/S12540-015-5098-Y
- ISSN
- 1598-9623
- Article Type
- Article
- Citation
- METALS AND MATERIALS INTERNATIONAL, vol. 21, no. 5, page. 891 - 896, 2015-09
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