| Autor: |
Yusong Li, Pingwei Xu, Yingfei Guo, Tingyi Lin, Xiang Li, Longwei Hu, Qinghua Song, Yilong Liang, Yu Liang |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Journal of Materials Research and Technology, Vol 25, Iss , Pp 4497-4509 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2238-7854 |
| DOI: |
10.1016/j.jmrt.2023.06.201 |
| Popis: |
In this work, a desirable combination of mechanical properties is achieved at 550 °C by tailoring the boundary microstructure between the primary α phase (αp) and the transformed β structure (βtrans) in a dual-phase Ti-6242s titanium alloy. The αp/βtrans boundary is displaced by a transition region that consists of β nano-plates or nanoprecipitates gradually penetrating into the αp in a particular semi-equiaxed microstructure (S-ES). The results show that the αp/βtrans boundary, where strain concentration easily occurs during deformation in the equiaxed microstructure (ES), induces recrystallization softening in the α phase. However, the transition region in the S-ES alleviates the strain localization and thus effectively inhibits the recrystallization softening that occurred in the α phase with concentrated strain. These β plates/precipitates in this region in turn enable an appropriate accumulation of dislocations. Significant improvement in the high-temperature strength, ∼240 MPa for the yield strength, is obtained for the S-ES relative to the ES. This work provides a new strategy for achieving outstanding strength at high temperature by designing special boundary architecture in dual-phase titanium alloys. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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