Temperature-independent modulus, i.e., the Elinvar effect, over a high and broad temperature range (119°C to 400°C) was tailored in a solution-treated metastable Ti-15Nb-5Zr-4Sn-1Fe alloy. This Elinvar effect was attained by continued growth and structure transition of the quench-induced trigonal athermal ω phase towards the high modulus thermal-induced hexagonal isothermal ω phase, compensating for the modulus softening of the β matrix due to thermal expansion during heating. Such ω phase-induced Elinvar effect can be tuned by varying heating rates to control the evolution of the ω phase and is potentially attainable in other metastable β-Ti alloys. This study showcases a new strategy for developing Elinvar Ti alloys by engineering the development of ω phase during heating.

中文翻译：

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工程 omega 相可在亚稳态 β-Ti 合金中实现较宽的温度范围 Elinvar 效应


在高温和宽温度范围内（119°C 至 400°C）的温独立模量，即 Elinvar 效应，在固溶处理的亚稳态 Ti-15Nb-5Zr-4Sn-1Fe 合金中进行了定制。这种 Elinvar 效应是通过淬火诱导的三角无热 ω 相向高模量热诱导六方等温 ω 相的持续生长和结构转变来实现的，从而补偿了由于加热过程中热膨胀而导致的β基体的模量软化。这种 ω 相诱导的 Elinvar 效应可以通过改变加热速率来控制 ω 相的演变来调节，并且有可能在其他亚稳态 β-Ti 合金中实现。本研究展示了一种通过设计加热过程中 ω 相的发展来开发 Elinvar Ti 合金的新策略。