Skip to Main content Skip to Navigation
Journal articles

Composite structure of α phase in metastable β Ti alloys induced by lattice strain during β to α phase transformation

Abstract : The β to α phase transformation of Ti alloys progresses in a displacive-diffusive mixed-mode. The associated transformation strain has important influence on the resultant microstructure. In this work, the microstructural features of α precipitates in a metastable β Ti alloy, Ti-7333, were thoroughly investigated. Special attention was paid to the intragranular α for the advantage of a stress-free transformation environment. Results show that the constituents of each α precipitate is not single. Two kinds of nano-sized α domains exist. One is situated on the broad face of the major α precipitate (named interface α), and the other goes through the major α (termed penetrating α). The interface α is related with the β matrix by the Burgers orientation relationship (BOR) and with the major α by a 60°/ rotation. The nucleation of such α particles is induced by the largest shear strain generated by the formation of the major α. They act as stress-associated sympathetic nuclei of the neighboring α precipitates and eventually contribute to the formation of the triangular α cluster. The penetrating α does not obey the BOR with the β matrix but is related with the major α by a 60° rotation around another axis. The nucleation of such α is induced by the largest normal strain generated by the formation of the main α plate. This work provides comprehensive information on the displacive characters of the β to α transformation and their impact on the microstructure of metastable β Ti alloys.
Document type :
Journal articles
Complete list of metadata

https://hal.univ-lorraine.fr/hal-03080413
Contributor : Yudong Zhang <>
Submitted on : Thursday, December 17, 2020 - 4:39:02 PM
Last modification on : Tuesday, March 30, 2021 - 3:12:03 PM

Identifiers

Citation

Ke Hua, Y. D. Zhang, Hongchao Kou, Jinshan Li, Weimin Gan, et al.. Composite structure of α phase in metastable β Ti alloys induced by lattice strain during β to α phase transformation. Acta Materialia, Elsevier, 2017, 132, pp.307-326. ⟨10.1016/j.actamat.2017.04.051⟩. ⟨hal-03080413⟩

Share

Metrics

Record views

17