کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1548708 997752 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase selection during solidification of undercooled Ni70.2Si29.8 eutectic alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Phase selection during solidification of undercooled Ni70.2Si29.8 eutectic alloy
چکیده انگلیسی
High undercooling (about 392 K) was achieved in the bulk eutectic Ni70.2Si29.8 alloy melt through glass fluxing combined with cyclic superheating. It is found that the metastable phases Ni3Si2 and NiSi are obtained through slow post-solidification when undercooling exceeds 240 K. The metastable phases are confirmed by using the method of X-ray diffraction and differential scanning calorimetry (DSC). Based on the principle of the free energy minimum and the transient nucleation theory, the phase selection of melt is investigated with regard to the metastable phases formation in the bulk undercooled eutectic Ni70.2Si29.8 melts. The formation of metastable phases from undercooled Ni70.2Si29.8 melts is ascribed to competitive nucleation with the undercooling, i.e. high undercooling facilitates the preferential nucleation of metastable phases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Natural Science - Volume 19, Issue 11, 10 November 2009, Pages 1619-1624
نویسندگان
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