کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7920654 1511493 2018 27 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Atomistic modeling of grain boundary behavior under shear conditions in magnesium and magnesium-based binary alloys
ترجمه فارسی عنوان
مدل سازی اتومیستی رفتار مرزی دانه تحت شرایط برش در آلیاژهای دوتایی مبتنی بر منیزیم و منیزیم
کلمات کلیدی
آلیاژهای دوتایی منیزیم، مرز دانه استاتیک مولکولی، انرژی های جداسازی، عیوب، انعطاف پذیری، ویژگی های مکانیکی، فلزات،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
In this study, the structure, the energetic, and the strength of a 101¯1<112¯0> symmetric tilt grain boundary in magnesium and magnesium binary alloys were analyzed in the framework of (semi-)empirical potentials. Following a systematic investigation of the transferability and accuracy of the interatomic potentials, atomistic calculations of the grain boundary energy, the grain boundary sliding energy, and the grain boundary strength were performed in pure magnesium and in binary MgX alloys (X = Al, Ca, Gd, Li, Sn, Y, Ag, Nd, and Pb). The data gained in this study were analyzed to identify the most critical material parameters controlling the strength of the grain boundary, and their consequence on atomic shuffling motions occurring at the grain boundary. From the methodology perspective, the role of in-plane and out-of plane relaxation on the grain boundary sliding energy curves was investigated. In pure magnesium, the results showed that in-plane relaxation is critical in activating b2{101¯1} twinning dislocation resulting in grain boundary migration. In the alloy systems, however, grain boundary migration was disabled as a consequence of the pinning of the grain boundary by segregated elements. Finally, while the grain boundary energy, the shape of the grain boundary sliding energy curves, and the grain boundary sliding energy are critical parameters controlling the grain boundary strength in pure magnesium, only the grain boundary energy and the segregation energy of the alloying elements at the grain boundary were identified as critical material parameters in the alloys system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 113, February 2018, Pages 108-118
نویسندگان
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