کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1447980 988661 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An analytical model for constitutional supercooling-driven grain formation and grain size prediction
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
An analytical model for constitutional supercooling-driven grain formation and grain size prediction
چکیده انگلیسی

Being able to predict the grain formation process and attendant grain size has been a central topic in solidification. Such an analytical model is presented for constitutional supercooling (CS)-driven grain formation with several simplifications. The model links the nucleation of new grains to the growth of a larger neighbouring grain. The average grain size (d¯) is thus determined by two components: the minimum growth (rcs) necessary to establish sufficient CS (ΔTn  ) for nucleating new grains, and the spatial mean distance (a¯) to the most potent available nucleants. Both spherical and planar growth fronts are considered, covering growth curvatures from small to infinite. Two distinct fundamental approaches are used, which result in identical descriptions of d¯, where d¯=a¯+D·ΔTn/(v·Q) (D is the diffusion coefficient, v is the growth velocity, Q is the growth restriction factor). The model is compared with literature data produced under various conditions and demonstrated on aluminium alloys as an example.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 58, Issue 9, May 2010, Pages 3262–3270
نویسندگان
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