کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7880958 | 1509593 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vacancy-mediated Ï-assisted α-phase formation mechanism in titanium-molybdenum alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This study investigates the mechanism of the Ï-to-α 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 Ï-to-α phase transformation is mediated by vacancy ordering. Atomic resolution Z-contrast images display high- and low-contrast regions in a single Ï precipitate, and it was found that the low Z-contrast regions are composed of an unknown structure, which differs significantly from the Ï-phase crystal structure. DFT calculations show that the vacancies could be stabilized by Mo and should preferably be assembled with ordering. The relaxed Ï-phase structure with ordered defects explains the intricate atomic images in the low Z-contrast regions of the Ï phase. It was found that this distorted Ï phase with defects is similar to the hexagonal α-phase structure with vacancies. It was confirmed that these vacancies could easily be occupied by Ti atoms and could form a perfect α phase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 83, 15 January 2015, Pages 499-506
Journal: Acta Materialia - Volume 83, 15 January 2015, Pages 499-506
نویسندگان
Sung-Hwan Kim, Sung Jin Kang, Min-Ho Park, Cheol-Woong Yang, Hu-Chul Lee, Heung Nam Han, Miyoung Kim,