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Article Dans Une Revue Acta Materialia Année : 2017

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

Résumé

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.
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Dates et versions

hal-03080413 , version 1 (17-12-2020)

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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, 2017, 132, pp.307-326. ⟨10.1016/j.actamat.2017.04.051⟩. ⟨hal-03080413⟩
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