Study on the Solidification of Ag-Ni Monotectic Alloy
文献类型：期刊论文
| 作者 | Deng Congkun1,2; Jiang Hongxiang2; Zhao Jiuzhou2; He Jie2; Zhao Lei3 |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2020-02-11 |
| 卷号 | 56期号:2页码:212-220 |
| 关键词 | Ag-Ni monotectic alloy liquid-liquid phase separation solidification microstructure microhardness simulation |
| ISSN号 | 0412-1961 |
| DOI | 10.11900/0412.1961.2019.00192 |
| 通讯作者 | Zhao Jiuzhou(jzzhao@imr.ac.cn) |
| 英文摘要 | 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. |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000507327100009 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Natural Science Foundation of China ; Basic Research Project of Education Department of Liaoning Province |
| 源URL | [http://ir.imr.ac.cn/handle/321006/136653]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Zhao Jiuzhou |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, 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. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。