| Autor: |
Amy X.Y. Guo, Bin Xiao, Qiling Xiao, Shan Cecilia Cao |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Journal of Materials Research and Technology, Vol 23, Iss , Pp 3119-3125 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2238-7854 |
| DOI: |
10.1016/j.jmrt.2023.01.208 |
| Popis: |
The disperse-precipitated ω has a significant strengthening effect on metastable β-titanium (Ti) alloys. The (211)β[1¯11]β/(2¯11)β[111]β slip systems are massively activated during plastic deformation. However, the interaction of the four-equivalent crystallographic ω variants with these slip systems has not been investigated. Here, we revisit the evolvement of the internal ω-precipitate via systematically exploring the compressive mechanical behavior of β-oriented Ti85Nb15 micropillars. Firstly, the four ω-variants show the strong deformation anisotropies. Secondly, this deformation anisotropy is pertinent to the interaction with dislocations. Dislocations originating from the β-matrix can continuously across the ω1-variant, but have no ability to across the ω2 variant. The accumulation of dislocations in the interface of ω2/β leads to severe local stress concentrations that ultimately prompts the dismemberment of ω2. Finally, we confirmed by first-principles calculations that the proliferation of ω1-variant owing to the reorientation of ω2-variant, that is, ω2→ω1, rather than a dissolution-reprecipitation mechanism, ω2→β→ω1. These findings are beneficial for a comprehensive understanding of the deformation mechanism of the ω-variants in metastable β-Ti alloys. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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