Separating the effect of athermal and isothermal ω on superelasticity in Ti-24Nb (at.%)

IF 5.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-13 DOI:10.1016/j.intermet.2025.109129

C.E.P. Talbot , N.L. Church , E.M. Hildyard , L.D. Connor , S. Michalik , N.G. Jones

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Abstract

Superelastic metastable β-Ti alloys, which undergo a stress-induced β → α″ transformation, have attracted significant attention in the biomedical and aerospace sectors. However, difficulty in predicting and controlling their superelastic properties, which is often linked to the ω phase, has prevented industrial uptake. The ω phase exists in two distinct forms, athermal (ω_ath) and isothermal (ω_iso), yet despite their differences the two are often conflated, leading to conflicting statements surrounding their influence. Using in situ synchrotron diffraction, the mechanical response of two initially identical samples of Ti-24Nb (at.%), one cooled to form ω_ath and the other aged to form ω_iso, was evaluated. The ω_ath sample exhibited superelasticity, with the ω_ath consumed by the growing α″ martensite. In contrast, the ω_iso sample showed no evidence of a transformation. These data conclusively show that the ω_ath should not be considered a problem for superelastic alloy development, whilst the evolution of ω_iso is highly detrimental.

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分离非热和等温ω对Ti-24Nb （at.%）超弹性的影响

超弹性亚稳态β-钛合金是一种应力诱导β→α″转变的合金，在生物医学和航空航天领域引起了广泛的关注。然而，预测和控制其超弹性性能的困难（通常与ω相有关）阻碍了工业应用。ω相以两种不同的形式存在，非热相（ωath）和等温相（ωiso），尽管它们不同，但它们经常被混为一谈，导致围绕它们的影响的相互矛盾的陈述。利用原位同步加速器衍射，研究了两种初始相同Ti-24Nb （at）样品的力学响应。%)，一个冷却形成ωath，另一个老化形成ωiso。ωath样品表现出超弹性，ωath被生长的α″马氏体消耗。相比之下，ωiso样本没有显示出变化的证据。这些数据表明，ω ω不应被认为是超弹性合金发展的一个问题，而ω ω ω的演变是非常有害的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.