摘要
Cu60Ni40 alloy was taken as the research object.The alloy was undercooled by fluxing method and circulation superheating method,and the solidified samples with different undercoolings were obtained by natural cooling method.The solidification process of undercooled melt was photographed by highspeed camera,and the transformation of solidification front morphology was studied.The microstructure and morphology of all undercooled samples were analyzed.It is found that the microstructure and morphology of Cu60Ni40 alloy change through the evolution process of"coarse dendrite-equiaxed crystal-oriented fine dendrite-equiaxed crystal"with the undercooling.Finally,the electron backscatter diffraction characterization of 261 K grain refinement structure shows that recrystallization occurs in the grain refinement structure with high undercooling,such as high proportion of high angle grain boundaries,random orientation of equiaxed grains and a large number of annealing twins found in the microstructure.
作者
KONG Huaye
TANG Cheng
HE Xibin
YANG Jin’e
XIE Jinpeng
WANG Hongfu
孔华野;TANG Cheng;HE Xibin;YANG Jin’e;XIE Jinpeng;WANG Hongfu(Shanxi Institute of Technology,Yanquan 045000,China;College of Mechanical Engineering,North University of China,Taiyuan 030051,China;Jiangsu Yingchuang Power Technol Co.Ltd,Suzhou 215000,China)
基金
by the National Natural Science Foundation of China(No.51701187)
the Basic Applied Research Projects in Shanxi Province(Nos.201801D221151 and 202103021224183)。
