Study on the Solidification of Ag-Ni Monotectic Alloy

doi:10.11900/0412.1961.2019.00192

IMR OpenIR

	Study on the Solidification of Ag-Ni Monotectic Alloy
	Deng Congkun 1,2; Jiang Hongxiang 1; Zhao Jiuzhou 1; He Jie 1; Zhao Lei 3
通讯作者	Zhao Jiuzhou(jzzhao@imr.ac.cn)
	2020-02-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	56 期号:2 页码:212-220
摘要	The Ag-Ni alloy has high electrical conductivity, good thermal conductivity, high specific heat capacity, and excellent electrical wear resistance if the Ni-rich phase is dispersedly distributed in the Ag-based matrix. It has been widely used in the medium load contactors, magnetic starters, relays, etc. However, Ag-Ni alloy is a typical monotectic system. Generally, the liquid-liquid phase transformation leads to the formation of a solidification microstructure with serious phase segregation. So far, there have been few studies on the solidification process of Ag-Ni alloys and powder-metallurgical techniques are commonly used to prepare Ag-Ni alloys in industry. In this work, casting experiments and microhardness test were carried out with the Ag-Ni monotectic alloy. The samples with composite microstructure, in which the Ni-rich particles dispersed homogeneously in Ag matrix, were obtained. The microhardness of Ag-Ni alloy increases with the increase of nickel content and the cooling rate of the sample during solidification. When the cooling rate during the liquid-liquid phase transition of the Ag-4.0%Ni alloy reaches 1800 K/s, the microhardness of the Ag-4.0%Ni alloy is close to that of the Ag-10.0%Ni sheet electrical contacts produced by powder metallurgy. A model describing the microstructure evolution during cooling Ag-Ni monotectic alloy melt has been proposed. The process of microstructure formation has been simulated and discussed in details. The results indicate that the cooling rate during the nucleation of the Ni-rich droplets/particles has a dominant influence on the solidification microstructure. The average radius of the Ni-rich particles increases with the increase of nickel content, while it decreases with the increase of the cooling rate during solidification. The average radius of the Ni-rich particles shows an inverse square root dependence on the cooling rate during the nucleation of the Ni-rich droplets/particles. The Ostwald coarsening of the Ni-rich droplets/particles is very weak during cooling Ag-Ni monotectic alloy melt. Rapid/sub-rapid solidification has a good application prospect in the preparation of the high-performance Ag-Ni contact materials.
关键词	Ag-Ni monotectic alloy liquid-liquid phase separation solidification microstructure microhardness simulation
资助者	National Natural Science Foundation of China ; Basic Research Project of Education Department of Liaoning Province
DOI	10.11900/0412.1961.2019.00192
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51771210] ; National Natural Science Foundation of China[51574216] ; National Natural Science Foundation of China[51774264] ; Basic Research Project of Education Department of Liaoning Province
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000507327100009
出版者	SCIENCE PRESS
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/136651
专题	中国科学院金属研究所
通讯作者	Zhao Jiuzhou
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Liaoning Shihua Univ, Sch Mech Engn, Fushun 113001, Peoples R China
推荐引用方式 GB/T 7714	Deng Congkun,Jiang Hongxiang,Zhao Jiuzhou,et al. Study on the Solidification of Ag-Ni Monotectic Alloy[J]. ACTA METALLURGICA SINICA,2020,56(2):212-220.
APA	Deng Congkun,Jiang Hongxiang,Zhao Jiuzhou,He Jie,&Zhao Lei.(2020).Study on the Solidification of Ag-Ni Monotectic Alloy.ACTA METALLURGICA SINICA,56(2),212-220.
MLA	Deng Congkun,et al."Study on the Solidification of Ag-Ni Monotectic Alloy".ACTA METALLURGICA SINICA 56.2(2020):212-220.