Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 861, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.144387
Keywords
Titanium; Yield stress; Slip system; Schmid factor; Grain size
Categories
Funding
- National Natural Science Foundation of China [52101130, 52071180]
- GuangDong Basic and Applied Basic Research Foundation [2020A1515110952, 2019A1515110051]
- Fellowship of China Postdoctoral Science Foundation [2022M710107]
- NSFC Original Exploration Project [12150001]
- Ministry of Science and Technology of China [2021YFA1200202]
- Program for Guangdong Introducing Innovative and Entrepreneurial Teams [2016ZT06G025]
Ask authors/readers for more resources
The slip system variations induced by excess yield stress in Ti at the early stage of plastic deformation were studied in-depth. It was found that normal grain refinement and suppressed dislocation source activation in refined-grain can significantly increase the yield stress. Combined calculations of Schmid factor and critical resolved shear stress showed that small-grain samples with higher yield stress can activate both < a >-prismatic slip and < c+a >-pyramidal slip, while large-grain samples can only activate < a >-prismatic slip. This slip system transition can explain the abnormal fine-grain strengthening effect and stress drop after yielding in Ti.
The excess yield stress induced slip system variations at the early stage of plastic deformation in Ti was in-depth studied. As a common sense, both the normal grain refinement according to the Hall-Petch relationship and the suppressed dislocation source activation in refined-grain can extensively increase the yield stress. In this study, combined calculations of Schmid factor and critical resolved shear stress suggest that small-grain samples with much higher yield stress could incorporate both < a >-prismatic slip and < c+a >-pyramidal slip, while only < a >-prismatic slip can be activated in the large-grain counterparts. This slip system transition can explain the abnormal fine-grain strengthening effect, which the experimental yield stress of small-grain sample deviates from the value that predicted by using Hall-Petch relationship, as well as the stress drop right after yielding in Ti. These findings could also provide a new strategy for designing high-strength metallic materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available