Non-classical {3 3 4}β type of twinned α′ martensite in a Ti-5.26 wt.% Cr alloy

Qiu, D., Zhang, M.-X., Kelly, P.M. and Furuhara, T. (2014) Non-classical {3 3 4}β type of twinned α′ martensite in a Ti-5.26 wt.% Cr alloy. Acta Materialia, 67 373-382. doi:10.1016/j.actamat.2013.12.008

Author Qiu, D.
Zhang, M.-X.
Kelly, P.M.
Furuhara, T.
Title Non-classical {3 3 4}β type of twinned α′ martensite in a Ti-5.26 wt.% Cr alloy
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2014-04-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.actamat.2013.12.008
Open Access Status Not yet assessed
Volume 67
Start page 373
End page 382
Total pages 10
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 2503 Ceramics and Composites
2506 Metals and Alloys
2507 Polymers and Plastics
2504 Electronic, Optical and Magnetic Materials
Abstract Some uncommon crystallographic features of α′ martensite were characterized in the martensitic transformation in a water-quenched Ti-5.26 wt.% Cr alloy. A pair of martensite plates, type K and type M, sit side-by-side and share a {3 3 4}β habit plane. However, they have different habit planes in terms of the hexagonal close-packed lattice. While the classical phenomenological theory of martensite crystallography (PTMC) is unable to explain the habit plane of type K martensite even though they contain {11̄01̄} internal twins, application of the edge-to-edge matching (E2EM) model succeeded in accounting for both the orientation relationship and the habit plane orientation of the two types of martensite. The elastic strain energy as a function of the thickness of type K martensite plates was calculated, and the result supports the preference of the E2EM model over PTMC in explaining this type of martensite. In addition, a self-accommodation mechanism for strain was proposed to maintain the macroscopic invariant plane, and reduce the overall elastic strain energy of the adjacent pair of martensite plates. The application of the E2EM model plus this self-accommodation mechanism provides a new perspective on understanding martensitic transformations and providing a link between the crystallography of displacive and diffusional transformations.
Keyword Crystallography
Edge to edge matching
Martensitic transformations
Strain energy
Ti alloys
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
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