Precipitation behavior of α phase during aging treatment in a β-quenched Ti-7333
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072 (China)
Highlights: • The precipitation behaviors of α precipitate are investigated in the hot-rolled Ti-7333. • The formation of the V-shaped α configuration is closely related to the variant selection of α phase. • The angle between the closely packed direction of α{sub GB} and GB plane plays a key role on the precipitation of α{sub GB}. - Abstract: In this work, the precipitation behavior of α phase during the isothermal aging treatment was investigated in the β-quenched Ti-7333. The results indicate that dislocations contribute to the precipitation of α phase with a dot-like morphology at the beginning of aging treatment, and these dot-like α precipitates holding the same Burgers orientation relationship (BOR) with respect to the β matrix coalesce into the platelet morphology. The platelet-like α precipitates that orientate to different growth directions combine with each other to form the V-shaped configuration. And the formation of this configuration is closely related with the variant selection (VS) of α phase, which is resulted from the perfect accommodation of transformation strain within the β matrix. Meanwhile, it is found that low-angle grain boundaries (LAGBs) and high-angle grain boundaries (HAGBs) can be decorated by α phase during the aging treatment, and its precipitation degree significantly depends on the angle between the closely packed direction of αGB and the GB plane. The volume fraction of α phase increases with increasing aging time, and this increasing volume fraction eventually results in the increase in micro-hardness of the alloy.
- OSTI ID:
- 22832980
- Journal Information:
- Materials Characterization, Vol. 140; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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