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Engineering omega phase enables a wide temperature range Elinvar effect in metastable β-Ti alloys.

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Názov: Engineering omega phase enables a wide temperature range Elinvar effect in metastable β-Ti alloys.
Autori: Fu, Yu1,2 (AUTHOR), Peng, Huabei1 (AUTHOR) penghuabei@scu.edu.cn, Wang, Hui1,3 (AUTHOR) qinghe5525@163.com, Wang, Haoliang4 (AUTHOR), Cheng, Jun1,5 (AUTHOR) chengjun_851118@126.com, Wen, Yuhua1 (AUTHOR), Xiao, Wenlong2,6 (AUTHOR), Zhao, Xinqing2 (AUTHOR), Ma, Chaoli2,6 (AUTHOR)
Zdroj: Journal of Materials Science & Technology. Aug2025, Vol. 225, p159-164. 6p.
Predmety: Titanium alloys, Heating control, Thermal expansion, X-ray diffraction, High temperatures
Abstrakt: • Wide temperature range Elinvar effect was achieved during heating of a solution-treated metastable β Ti alloy. • In-situ XRD and TEM were employed to elucidate the origin of the Elinvar effect. • The ω ath phase growth and its gradual transition towards ω iso phase led to the Elinvar effect. • The Elinvar effect can be tailored by the heating rate in metastable β Ti alloys. 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. [Display omitted] [ABSTRACT FROM AUTHOR]
Databáza: Supplemental Index
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