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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800 MPa屈服强度应变变形钛合金的局部应力松弛耦合强化

采用“d电子合金设计”方法，设计了一种新型应变可转化β-亚稳钛合金Ti-7.5 Cr-1Sn-1Fe (TCSF)，实现了孪生诱导塑性（TWIP）和相变诱导塑性（TRIP）变形机制的独特平衡。拉伸测试显示了优异的拉伸性能，包括高屈服强度~ 800 MPa，极限拉伸强度~ 1400 MPa，以及扩展塑性变形的异常应变硬化。显微组织分析表明，合金中存在高密度的{332}< 113 >形变孪晶，孪晶/基体界面处形成应力诱导的α″马氏体，有利于内应力松弛。该合金表现出动态复合效应，由分层变形孪晶网络驱动，阻碍位错运动，增强应变硬化，而变形孪晶产生的局部应力在孪晶/基体界面处由应力诱导的马氏体形成而松弛，促进均匀延伸。本研究强调了高强度和应变硬化钛合金的设计策略。

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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.