کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8948631 | 1645675 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Atomic study on the interaction between superlattice screw dislocation and γ-Ni precipitate in γâ²-Ni3Al intermetallics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Nanoscale γ precipitates in primary microscale γⲠprecipitates of Ni-alloys have been recently observed in experiments. Nanoscale γ precipitates have been one of the potential factors changing the dislocation motion in primary γⲠprecipitates and affecting mechanical properties of Ni-alloys. In this work, the dependency of the interaction between a superlattice screw dislocation and the spherical γ-Ni precipitates in γâ²-Ni3Al intermetallics on the sizes of the γ precipitate is studied via molecular statics simulations. The calculated external stress, morphology of superlattice screw dislocation, and energy states show that the stress necessary to cut through the precipitate is significantly dependent on the interface between the γ precipitate and γâ²-matrix as well as on the antiphase boundary (APB) energy; the interface between the γ precipitate and γâ²-matrix inhibits the superlattice dislocation during cutting into the γ precipitate, whereas the APB expansion hinders the cut-out action. Among the examined cases, a precipitate of approximately 3â¯nm in diameter is found to require the largest stress to cut through. We show the origin of interaction between superlattice screw dislocation and γ precipitates in γⲠmatrix from the atomic and energetic perspectives.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 102, November 2018, Pages 1-5
Journal: Intermetallics - Volume 102, November 2018, Pages 1-5
نویسندگان
Hiromi Kondo, Masato Wakeda, Ikumu Watanabe,