摘要
Liquid-liquid phase separation in the undercooled Ni-20%Pb(mole fraction, the same below if not mentioned) hypermonotectic melts was investigated by the observation of the water-quenched structure and DTA analysis. The results indicate that the number of spherical cells in the water-quenched microstructure increases with dropping temperature, and the cells gather and grow up obviously. The spherical cell origins from L1 phase separated from homogeneous melt, and is the product of monotectic reaction. Both results of the water-quenched structures and DTA analysis prove that liquid phase separation still occurs in the highly undercooled Ni-Pb hypermonotectic alloy melts, and liquid phase separation in the immiscible gap can not be fully inhibited by high undercooling and rapid solidification.
Liquid-liquid phase separation in the undercooled Ni-20% Pb（mole fraction, the same below if not mentioned） hypermonotectic melts was investigated by the observation of the water-quenched structure and DTA analysis. The results indicate that the number of spberical cells in the water-quenched microstructure increases with dropping temperature, and the cells gather and grow up obviously. The spherical cell origins from L1 phase separated from homogeneous melt, and is the product of monotectic reaction. Both results of the water-quenched structures and DTA analysis prove that liquid phase separation still occurs in the highly undercooled Ni-Pb hypermonotectic alloy melts, and liquid phase separation in the immiscible gap can not be fully inhibited by high undercooling and rapid solidification.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2006年第2期290-293,共4页
Transactions of Nonferrous Metals Society of China
基金
Project(50171055) supported by the National Natural Science Foundation of China
Project(2004E108) supported by Shaanxi Natural Science Foundation, China
Project(03JK132) supported by Shaanxi Education Bureau Foundation, China
Project(200208) supported by the Doctorate Creation Foundation of Northwestern Polytechnical University
关键词
过偏晶合金
Ni-Pb合金
偏晶体
过冷度
分离
Ni-Pb hypermonotectic alloy
monotectic cell
high undercooling
liquid-liquid phase separation
water-quenched microstructure
