摘要
Non-equilibrium solidification structures of Cu55Ni45 and Cu55Ni43Co2 alloys were prepared by the molten glass purification cycle superheating method.The variation of the recalescence phenomenon with the degree of undercooling in the rapid solidification process was investigated using an infrared thermometer.The addition of the Co element affected the evolution of the recalescence phenomenon in Cu-Ni alloys.The images of the solid-liquid interface migration during the rapid solidification of supercooled melts were captured by using a high-speed camera.The solidification rate of Cu-Ni alloys,with the addition of Co elements,was explored.Finally,the grain refinement structure with low supercooling was characterised using electron backscatter diffraction(EBSD).The effect of Co on the microstructural evolution during nonequilibrium solidification of Cu-Ni alloys under conditions of small supercooling is investigated by comparing the microstructures of Cu55Ni45 and Cu55Ni43Co2 alloys.The experimental results show that the addition of a small amount of Co weakens the recalescence behaviour of the Cu55Ni45 alloy and significantly reduces the thermal strain in the rapid solidification phase.In the rapid solidification phase,the thermal strain is greatly reduced,and there is a significant increase in the characteristic undercooling degree.Furthermore,the addition of Co and the reduction of Cu not only result in a lower solidification rate of the alloy,but also contribute to the homogenisation of the grain size.
作者
安红恩
Bih-Lii Chua
Ismail Saad
Willey Yun Hsien Liew
AN Hongen;Bih-Lii Chua;Ismail Saad;Willey Yun Hsien Liew(Materials Engineering Research Group,Faculty of Engineering,University Malaysia Sabah,88400 Kota Kinabalu,Sabah,Malaysia;College of Mechanical and Electronic Engineering,Huanghe Jiaotong University,Jiaozuo 454950,China;Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment,Jiaozuo 454950,China;Centre of Research in Energy and Advanced Materials,Faculty of Engineering,Universiti Malaysia Sabah,Jalan UMS,88400 Kota Kinabalu,Sabah,Malaysia;Nano Engineering and Materials Research group,Faculty of Engineering,University Malaysia Sabah,88400 Kota Kinabalu,Sabah,Malaysia)
