کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1445374 1509585 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modelling the role of compositional fluctuations in nucleation kinetics
ترجمه فارسی عنوان
مدل سازی نقش نوسانات ترکیب شده در سینتیک هسته ای
کلمات کلیدی
سینتیک، هسته و رشد، رسوبات، انرژی رابط نوسانات ترکیب شیمیایی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

The classical nucleation theory of precipitate nucleation in interstitial/substitutional alloys is applied to account for the influence of spatial A–B composition fluctuations in an A–B–C matrix on the kinetics of nucleation of (A,B)3C precipitates. A and B are substitutional elements in the matrix and C is an interstitial component, assumed to preferentially bind to B atoms. All lattice sites are considered as potential nucleation sites. The fluctuations of chemical composition result in a local variation of the nucleation probability. The nucleation sites are eliminated from the system if they are located in a C-depleted diffusion zone belonging to an already nucleated and growing precipitate. The chemistry is that of an Fe–Cr–C system, and the specific interface energy is treated as a free parameter. Random, regular and homogeneous A–B distributions in the matrix are simulated and compared for various values of the interface energy. An increasing enhancement of the role of compositional fluctuations on nucleation kinetics with increasing interface energy and decreasing chemical driving force is observed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 91, 1 June 2015, Pages 365–376
نویسندگان
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