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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 1    February 2001

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Microstructures of rapidly solidified Al-In immiscible alloy
LIU Yuan(刘  源),GUO Jing-jie(郭景杰),  SU Yan-qing(苏彦庆),
DING Hongsheng(丁宏生),  JIA Jun(贾  均)

School of Materials Science and Engineering,
 Harbin Institute of Technology, Harbin 150001, P.R.China

Abstract:The microstructural evolution and growth mechanism of the melt spun Al-In monotectic alloy were studied. During the rapid solidification of Al-17.5%In, a cellular structure→equiaxed structure transition occurs through the ribbon thickness. The as-solidified microstructures are characterized by a homogeneous distribution of nanometer sized indium particles embedded within the matrix. However, with increasing distance from the chilled surface, the average particle size increases. In the underside of the ribbon, some particle arrays are perpendicular to the growth front. Next, all of the indium particles distribute randomly within the matrix. In the upside of the ribbon, some bigger indium particles distribute along the equiaxed grain boundaries. The diameter distributions of indium particles within Al matrix are bimodal. Compared with the massive partitionless solidification, the liquid separation process is the prevailing process during the nonequilibrium solidification. The cooling rate, the interface energies (γS1/L1,γS1/L2 and γL1/L2) and the growth mechanism all have effects on the microstructure.

 

Key words: Al-In immiscible alloy;  rapid solidification; microstructure

ISSN 1672-7029
CN 43-1423/U

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