Effects of Nb and o Contents on the Negative Linear Thermal Expansion Behaviors of Cold Rolled Ti-34Nb Alloys

• Published in: Key engineering materials Vol. 923; pp. 31 - 36
• Main Authors: Wu, Xiang Wei, Chen, Feng, Zou, Wen Qian
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 28.06.2022
• Subjects: Cold rolling; Niobium; Optical microscopy; Stability; Texture; Thermal expansion; Thermomechanical analysis; Titanium base alloys; Martensite Phase Transformation; Cold Rolled Ti-Nb-O Alloys; Coefficient of Negative Linear Thermal Expansion
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/p-69lhp9

In this study, the effects of Nb and O contents on the negative thermal expansion behaviors including the coefficient of negative thermal expansion and matensite (α) stability of cold rolled (CR) Ti-34Nb alloys was investigated by optical microscopy, X-ray diffraction and Thermomechanical analysis. Results show that texture strength of CR-Ti-xNb-xO alloys is related to β stability, the addition of Nb and O (β stabilizers) enhances the texture strength. XRD results indicate that Nb and O inhibit the formation of α. The coefficient of negative thermal expansion of CR-Ti-xNb-xO alloys decrease with the increase of Nb and O contents. Moreover, cyclic thermal expansion results reveal that Nb and O promote the decomposition of α.