%0 Journal Article %T Effect of cooling rate on microstructure of B2-NiSc intermetallics %A Chang %A Yatao %A Chen %A Hao %A Cui %A Hongbao %A Guo %A Xuefeng %A Yuan %A Zhipeng %J - %D 2019 %R 10.30765/er.39.3.04 %X Sa£¿etak Ni-50at%Sc alloy was prepared by centrifugal casting method. Volume fraction, the actual content of B2-NiSc and second phase Ni2Sc in alloy were analyzed with an Image-Pro Plus software. The cooling rates for the solidified thin plate with thickness of 2.65mm, 1.2mm, 0.75mm and 0.35 mm are 1164, 2570, 4112 and 8811 K¡¤s- 1, respectively. It is found that d=0.5 mm was an critical dimension which corresponds to an abrupt change in the solidification rate. It is also found that (Ni2Sc+NiSc)eutectic was dispersed at grain boundary or between dendritic arms due to the loss of Sc element during melting. While d£¾ 0.5mm (corresponding to the thin plate with thickness of 0.75mm, 1.20mm and 2.65 mm), the solidification structure consists of primary phase B2-NiSc and (Ni2Sc+NiSc)eutectic. While d £¼ 0.5mm (corresponding to the thin plate with thickness of 0.35 mm), the solidification structure is composed of fine globular B2-NiSc and relatively small amounts of (Ni2Sc+NiSc)eutectic. Based on the phase volumetric analyzing of the microstructure with an Image-Pro Plus software, the loss of Sc element during melting was about 3.01~3.10 at%. The eutectic NiSc in the lamellar eutectic structure together with the primary phase B2-NiSc form a larger single phase NiSc, while Ni2Sc with the form of particles is distributed on the grain boundaries after (970 ¡æ, 72 h) homogenization heat treatment %K centrifugal casting %K B2-NiSc %K microstructure evolution %K rapid solidification %K heat treatment %K (Ni2Sc+NiSc)eutectic %U https://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=322839