کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7883299 1509617 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Entropy change linked to the martensitic transformation in metamagnetic shape memory alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Entropy change linked to the martensitic transformation in metamagnetic shape memory alloys
چکیده انگلیسی
The magnetic contribution to the martensitic transformation entropy change plays a crucial role in the transition properties of metamagnetic shape memory alloys. This contribution leads to a common dependence of the total entropy change at the structural transformation, ΔStr, on the normalized temperature difference δAtr=(TCA-Ttr)/TCA (where TCA is the Curie temperature of the austenitic phase and Ttr is the transformation temperature) whose main feature is a decrease in ΔStr with increasing δAtr. A phenomenological model based on a Bragg-Williams approximation has been proposed to describe the observed behaviour in terms of the evolution of the magnetic contribution to the total entropy change. The proposed approximation provides a good fitting between predicted and experimental entropy changes obtained for different Ni-Mn-based alloy systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 60, Issues 6–7, April 2012, Pages 3168-3175
نویسندگان
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