IMR OpenIR
Study on the Solidification of Ag-Ni Monotectic Alloy
Deng Congkun1,2; Jiang Hongxiang1; Zhao Jiuzhou1; He Jie1; Zhao Lei3
Corresponding AuthorZhao Jiuzhou(jzzhao@imr.ac.cn)
2020-02-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:2Pages:212-220
AbstractThe 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.
KeywordAg-Ni monotectic alloy liquid-liquid phase separation solidification microstructure microhardness simulation
Funding OrganizationNational Natural Science Foundation of China ; Basic Research Project of Education Department of Liaoning Province
DOI10.11900/0412.1961.2019.00192
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000507327100009
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136651
Collection中国科学院金属研究所
Corresponding AuthorZhao Jiuzhou
Affiliation1.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
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Deng Congkun]'s Articles
[Jiang Hongxiang]'s Articles
[Zhao Jiuzhou]'s Articles
Baidu academic
Similar articles in Baidu academic
[Deng Congkun]'s Articles
[Jiang Hongxiang]'s Articles
[Zhao Jiuzhou]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Deng Congkun]'s Articles
[Jiang Hongxiang]'s Articles
[Zhao Jiuzhou]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.