کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8148362 | 1524331 | 2018 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Transition from hypereutectic to hypoeutectic for rapid solidification in an undercooled Co-B alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Phase selection, a common and important phenomenon in rapid solidification, determines the solidification sequence and the mechanical/physical properties. In this work, a Co-20â¯at%B hypereutectic alloy was undercooled by the melt fluxing technique and the microstructure was characterized by the back-scattering diffraction technique. A transition from hypereutectic to hypoeutectic was found at a critical undercooling of ÎTâ¯=â¯119â¯K. When ÎTâ¯<â¯119â¯K, a primary directional dendritic β-Co3B phase surrounded by the regular α-Coâ¯+â¯Î²-Co3B lamellar eutectics was found. When ÎTâ¯>â¯119â¯K, the above hypereutectic microstructure changes into hypoeutectic structure with the α-Co phase as the primary phase. According to dendrite growth model, the transition from hypereutectic to hypoeutectic can be ascribed to the higher growth velocity of the α-Co phase than the β-Co3B phase, i.e., the growth-controlled mechanism. The current work shows also that there is a coupled zone skewed to the β-Co3B phase in the Co-B alloys system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 499, 1 October 2018, Pages 98-105
Journal: Journal of Crystal Growth - Volume 499, 1 October 2018, Pages 98-105
نویسندگان
Yixuan He, Jinshan Li, Jun Wang, Eric Beaugnon,