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We investigated the morphological and crystallographic features of α' martensite variants in Ti-25 at% Hf and Ti-50 at% Hf alloys by transmission Kikuchi diffraction and transmission electron microscopy. On the basis of the results, we also discussed the formation process of variants and the self-accommodation. Both alloys, after solution-treatment and quenching in ice water, consisted of α' martensite with a hexagonal close-packed structure. The α' martensite exhibited a larger plate-like morphology several micrometers in length, along with a finer morphology with a width of tens of nanometers. The formation of {101-1}α' twins was induced within a larger correspondence variant (CV) as a lattice-invariant shear (LIS), and {101-1}α' twins were also the boundaries bounded two neighboring CVs. In formation process of the martensite variants of Ti–Hf alloys, a larger CV with a plate-like morphology is first formed with a {101-1}α' twin as an LIS in a β parent phase; finer CVs are subsequently generated from the step-like boundary with the {101-1}α' twin plane, followed by the formation of a pair of CVs with the twin plane to relax the transformation strain.

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  This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s40830-025-00529-w

Keyword: Ti–Hf alloy, Thermoelastic martensitic transformation, Self-accommodation, Twin, Transmission Kikuchi diffraction, Transmission electron microscopy

Date published: 2025-02-21

Publisher: Springer Science and Business Media LLC

Journal:

• Shape Memory and Superelasticity (ISSN: 2199384X) vol. 11 issue. 1 p. 100-108

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Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5791

First published URL: https://doi.org/10.1007/s40830-025-00529-w

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Updated at: 2026-02-21 16:30:24 +0900

Published on MDR: 2026-02-21 13:38:39 +0900