1. Promoting direct and ultrafast precipitation of the α phase in the metastable Ti-10V-6Cu alloy.
- Author
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Pan, Shiwei, Qian, Feng, Xu, Shun, Zhang, Fei, Chen, Kai, Ying, Jiayao, and Fan, Qunbo
- Subjects
PRECIPITATION (Chemistry) kinetics ,KIRKENDALL effect ,ALLOYS ,PHASE separation ,TITANIUM alloys ,NUCLEATION - Abstract
Direct aging of water-quenched metastable β-titanium alloys usually follows the sequence: rapid growth of ω
iso and then slow transformation into α. To inhibit ωiso growth and promote α nucleation, 6% pre-deformation was introduced in Ti-10V-6Cu alloy before 500°C/60s aging. An ultrafast α-formation and a few α-free kink-bands are observed, indicating the alteration of the precipitation sequence. For α-nucleation without ωiso as the sites, it shows that O' nanodomains induced by stress accumulation around slip bands mediate the ultrafast nucleation of hcp-α structure, while dislocation pipe diffusion accelerates the necessary phase separation. This provides new insights into regulating precipitation kinetics of age-hardenable β-titanium alloys. [ABSTRACT FROM AUTHOR]- Published
- 2024
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