The influence of aluminum and oxygen additions on intrinsic structural instabilities in titanium-molybdenum alloys

SCRIPTA MATERIALIA

卷:152

Article

Zheng, Yufeng^1,2  Alam, Talukder^3,4  Banerjee, Rajarshi^3,4  Banerjee, Dipankar⁵  Fraser, Hamish L.^1,2 

[1] Ohio State Univ, Ctr Accelerated Maturat Mat, Columbus, OH 43212 USA

[2] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43212 USA

[3] Univ North Texas, Mat Res Facil, Denton, TX 76207 USA

[4] Univ North Texas, Dept Mat Sci & Engn, Denton, TX 76207 USA

[5] Indian Inst Sci, Dept Mat Engn, Bengaluru 560012, Karnataka, India

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

DOI  :  10.1016/j.scriptamat.2018.04.030

来源: Elsevier

【 摘 要 】

The influences of aluminum and oxygen additions on structural instabilities in the beta phase of binary Ti-Mo alloys have been investigated, using conventional and aberration-corrected scanning/transmission electron microscopy and atom-probe tomography. An addition of 5 wt% Al to the alloy Ti-18 wt% Mo tends to decrease the stability of the 2/3<111> longitudinal phonon, compared with that of the phase O' formed by the {110}<1<(1)over bar>0> transverse phonon. Experiments have been performed to assess whether interstitial oxygen influences these phase instabilities by adding yttrium to getter the matrix oxygen. It has been found that oxygen is not a necessary alloying addition to form the O' phase. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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