Journal Article

IMPULSE-2017-00327

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Composite structure of α phase in metastable β Ti alloys induced by lattice strain during β to α phase transformation

Hua, K. (Corresponding author) ; Zhang, Y. ; Kou, H. ; Li, J. ; Gan, W.MLZ* ; Fundenberger, J.-J. ; Esling, C.

2017
Elsevier Science Amsterdam [u.a.]

Please use a persistent id in citations: doi:10.1016/j.actamat.2017.04.051

Abstract: The b to a phase transformation of Ti alloys progresses in a displacive-diffusive mixed-mode. Theassociated transformation strain has important influence on the resultant microstructure. In this work,the microstructural features of a precipitates in a metastable b Ti alloy, Ti-7333, were thoroughlyinvestigated. Special attention was paid to the intragranular a for the advantage of a stress-free transformationenvironment. Results show that the constituents of each a precipitate is not single. Two kindsof nano-sized a domains exist. One is situated on the broad face of the major a precipitate (namedinterface a), and the other goes through the major a (termed penetrating a). The interface a is relatedwith the b matrix by the Burgers orientation relationship (BOR) and with the major a by a 60/〈1120〉arotation. The nucleation of such a particles is induced by the largest shear strain generated by the formationof the major a. They act as stress-associated sympathetic nuclei of the neighboring a precipitatesand eventually contribute to the formation of the triangular a cluster. The penetrating a does not obeythe BOR with the b matrix but is related with the major a by a 60 rotation around another 〈1120〉a axis.The nucleation of such a is induced by the largest normal strain generated by the formation of the main aplate. This work provides comprehensive information on the displacive characters of the b to a transformationand their impact on the microstructure of metastable b Ti alloys.

Keyword(s): Engineering, Industrial Materials and Processing (1st) ; Materials Science (2nd)

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Contributing Institute(s):

1. MATSCI
2. STRESSI

Experiment(s):

1. STRESS-SPEC: Materials science diffractometer (SR3)

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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