Vacancy-mediated ω-assisted α-phase formation mechanism in titanium-molybdenum alloy

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Title
Vacancy-mediated ω-assisted α-phase formation mechanism in titanium-molybdenum alloy
Author(s)
Sung-Hwan Kim; Sung Jin Kang; Min-Ho Park; Cheol-Woong Yang; Hu-Chul Lee; Heung Nam Han; Miyoung Kim
Publication Date
2015-01
Journal
ACTA MATERIALIA, v.83, no., pp.499 - 506
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
This study investigates the mechanism of the x-to-a phase transformation in a titanium–molybdenum alloy. Using aberration-corrected high annular angle dark-field scanning transmission electron microscopy and density functional theory (DFT), the authors demonstrate that the x-to-a phase transformation is mediated by vacancy ordering. Atomic resolution Z-contrast images display high- and low-contrast regions in a single x precipitate, and it was found that the low Z-contrast regions are composed of an unknown structure, which differs significantly from the x-phase crystal structure. DFT calculations show that the vacancies could be stabilized by Mo and should preferably be assembled with ordering. The relaxed x-phase structure with ordered defects explains the intricate atomic images in the low Z-contrast regions of the x phase. It was found that this distorted x phase with defects is similar to the hexagonal a-phase structure with vacancies. It was confirmed that these vacancies could easily be occupied by Ti atoms and could form a perfect a phase.
URI
https://pr.ibs.re.kr/handle/8788114/746
ISSN
1359-6454
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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