Abstract
The mechanism of negative linear thermal expansion (NLTE) of Ti-34Nb (wt.%) alloy after 90% cold rolling is investigated by X-ray diffraction, thermal expansion and transmission electron microscopy. From the results, it is observed that 90% cold-rolled Ti-34Nb alloy is composed of β and α″ (Martensite) phases with the existence of < 110 > β and < 010 > α″ textures along rolling direction (RD). The cyclic thermal expansion, XRD and TEM studies show that when the thermal cycle temperature is at 100 °C, the RD of 90% cold-rolled Ti-34Nb alloy performs a reversible NLTE, which gradually weakens when thermal cycle temperature is at 300 °C, attributing to the gradual decomposition of α″-phase. When thermal cycle temperature rises to 380 °C, the reversible NLTE disappears and turns into positive linear thermal expansion, meanwhile, α″-phase decomposes completely. Based on the formation of β and α″ textures by cold rolling and α″\(\leftrightarrow\) β thermo-reversible transformation mechanism, the NLTE mechanism of 90% cold-rolled Ti-34Nb alloy is successfully explained. Moreover, according to the present results, a novel strategy is proposed to tailoring the negative coefficient of linear thermal expansion by changing α″ content, which improves the application potential of Ti alloys.
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Acknowledgements
The authors gratefully acknowledge the financial supports from the National Aerospace Science Foundation of China (Grant No. 20133069014) and National Natural Science Foundation of China (Grant No. U1737103) and Open Foundation of Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials (Grant No. GXYSOF1802).
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Wu, X., Zou, W., Huang, J. et al. The mechanism of negative linear thermal expansion behavior of cold-rolled Ti-34Nb alloy. J Mater Sci 56, 5190–5200 (2021). https://doi.org/10.1007/s10853-020-05574-7
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DOI: https://doi.org/10.1007/s10853-020-05574-7