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In this study, the propagation behavior of {332}<113>β twins was investigated in a Ti-12Mo (wt.%) alloy with micro-segregation bands (Mo content ranging from 10 to 13 wt.%). A unique transition from {332}<113>β twins to α"-martensite was observed when those twins propagated across the Mo-lean bands inside the grain. A deflection angle of ~18 º was found between the twin boundary and the α"-martensite plate. This transition was more frequently found at relatively higher stresses. Thermodynamic analysis revealed that the Mo content together with the applied stress govern the required mechanical work for triggering α" martensitic phase transformation. The stress-induced α" martensitic phase transformation was easier to trigger in the Mo-lean bands, with a spontaneous interruption of the {332}<113>β twin propagation. The present chemically segregated microstructure provides a novel approach to comprehensively characterize the variable deformation modes in metastable β titanium alloys.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: beta titanium alloy, martensitic transformation, twinning

Date published: 2024-02-03

Publisher: Elsevier BV

Journal:

• Scripta Materialia (ISSN: 13596462) vol. 224 issue. 15 116024

Funding:

• Japan Society for the Promotion of Science JP26420733

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4436

First published URL: https://doi.org/10.1016/j.scriptamat.2024.116024

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Updated at: 2026-02-03 12:30:04 +0900

Published on MDR: 2026-02-03 09:46:26 +0900