A nano-scale instability in the β phase of dilute Ti-Mo alloys

SCRIPTA MATERIALIA

卷:116

Article

Zheng, Yufeng¹  Banerjee, Dipankar²  Fraser, Hamish L.¹ 

[1] Ohio State Univ, Dept Mat Sci & Engn, Ctr Accelerated Maturat Mat, 1305 Kinnear Rd, Columbus, OH 43212 USA

[2] Indian Inst Sci, Dept Mat Engn, CV Raman Ave, Bengaluru 560012, Karnataka, India

关键词: Titanium alloys;    Phase transformations;    High-resolution electron microscopy;    Nano-scale instability;    O ' phase;   

DOI  :  10.1016/j.scriptamat.2016.01.044

来源: Elsevier

【 摘 要 】

A nano-scale instability in the beta phase resulting in the formation of the disordered orthorhombic O' phase has been discovered in a fairly dilute binary Ti-Mo alloy, using selected area electron diffraction and high resolution scanning transmission electron microscopy. The O' phase informed in the alloy when the Mo content exceeds a critical value. The instability occurs in beta-solutionized samples that have been quenched to room temperature and is found to co-exist with athermal omega to phase. Interestingly, this nano-scale instability, involving the {110}<1<(1)over bar>0> soft-phonon shuffle, occurs in the beta phase without deliberate additions of either interstitial or substitutional solutes. (C) 2016 Elsevier Ltd. All rights reserved.

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