کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9796274 | 1514944 | 2005 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Numerical study of the flow responses and the geometric constraint effects in Ni-base two-phase single crystals using strain gradient plasticity
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The [0 0 1] tensile flow of a single-crystal superalloy (CMSX-4) having a high volume fraction of regularly-arrayed cuboidal γⲠprecipitates was simulated using a gradient-dependent plasticity model for the constitutive description of the γ-matrix. The simulated flow curves showed flow softening in the early stage of straining. Flow softening was accompanied by the organized catastrophic plastic flow of the γ-matrix, which resulted from the breakdown of the geometric (or kinematic) constraints imposed by the γ/γⲠmicrostructure. The flow-softening behavior was influenced by the thickness of γ-matrix channels (a volume fraction of the γⲠprecipitates), the flow property of the γ-matrix and the geometry of the γâ²-precipitate edge. In particular, changing the radius of the γâ²-precipitate edge resulted in a dramatic variations in the flow curves. The present unit-cell simulations exhibited good predictions for the γâ²-precipitate size dependence of the flow stress at moderate strains.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 397, Issues 1â2, 25 April 2005, Pages 69-83
Journal: Materials Science and Engineering: A - Volume 397, Issues 1â2, 25 April 2005, Pages 69-83
نویسندگان
Y.S. Choi, T.A. Parthasarathy, D.M. Dimiduk, M.D. Uchic,