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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

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Surface tension of molten Ni-(Cr, Co, W) alloys and segregation of elements
XIAO Feng(肖 锋)1, LIU Lan-xiao(刘兰霄)1, YANG Ren-hui(杨仁辉)1,
ZHAO Hong-kai(赵红凯)1, FANG Liang(方 亮)2, ZHANG Chi(张 弛)1

1. Materials Interfacial Physical-Chemistry Research Institute, Chongqing Institute of Technology,Chongqing 400050, China;
2. Department of Applied Physics, Chongqing University, Chongqing 400044, China

Abstract:Surface tension of molten Ni-(Cr, Co, W) alloys was measured at the temperature of 1 773−1 873 K in an Ar+3%H2 atmosphere using an improved sessile drop method. The segregation of Cr, Co and W in alloy was calculated and analyzed using Butler’s equation. The results show a good agreement between measured and calculated data. The surface tension of molten Ni-(Cr, Co, W) alloys decreases with increasing temperature. In Ni-(Cr, Co, W) alloys, the element with lower surface tension tends to segregate on the surface of molten alloy while that with higher surface tension tends to segregate inside of the molten alloy. The larger the differences in surface tension, atom radius and electron configuration between solvent and solute are, the more significant the segregation is. As a result, Ni segregates onto the surface and Co and W segregate inside the alloys.

 

Key words: Ni-Cr; Ni-Co; Ni-W; surface tension; sessile drop method; segregation

ISSN 1672-7029
CN 43-1423/U

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