Coupling strengthening with local stress relaxation in an 800 MPa yield strength strain transformable titanium alloy

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-03-26 DOI:10.1016/j.scriptamat.2025.116669

N. Keskar , S.A. Mantri , Y. Danard , T. Ingale , M.S.K.K.Y. Nartu , P. Agrawal , L. Lilensten , F. Sun , F. Prima , R. Banerjee

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引用次数: 0

Abstract

A novel strain transformable β-metastable titanium alloy, Ti–7.5 Cr–1Sn–1Fe (TCSF), was designed using the "d-electron alloy design" method to achieve a unique balance of twinning induced plasticity (TWIP) and transformation induced plasticity (TRIP) deformation mechanisms. Tensile testing revealed excellent tensile properties, including a high yield strength ∼800 MPa, an ultimate tensile strength ∼1400 MPa, and exceptional strain-hardening over extended plastic deformation. Microstructural analysis revealed a high density of {332}〈113〉 deformation twins, with stress-induced α″ martensite forming at the twin/matrix interfaces, facilitating internal stress relaxation. This alloy exhibits a dynamic composite effect, driven by hierarchical deformation twin networks obstructing dislocation motion, enhancing strain hardening, while the local stresses generated by the deformation twinning is relaxed by stress induced martensite formation at the twin/matrix interface, promoting uniform elongation. This study highlights promising design strategies for high strength and strain hardenable Ti alloys.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.