Preparation and arc erosion characteristics of ultrafine crystalline CuCr50 alloy by MA-SPS
详细信息 查看全文
- 作者：Kunyu Shi 史昆玉 ; Lihong Xue 薛丽红 ; Youwei Yan…
- 关键词：mechanical alloying ; spark plasma sintering ; ultrafine crystalline ; CuCr50 alloys ; arc erosion characteristics
- 刊名：Journal of Wuhan University of Technology--Materials Science Edition
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：31
- 期：5
- 页码：1081-1085
- 全文大小：1,037 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Chinese Library of Science - 出版者：Wuhan University, co-published with Springer
- ISSN：1993-0437
- 卷排序：31
文摘
The ultrafine crystalline CuCr50(Cr 50 wt%) alloys were fabricated by a combination of mechanical alloying and spark plasma sintering process. The effects of milling time on crystallite size and solid solubility of the CuCr50 composite powders were investigated. The results showed that crystallite size of powders decreases gradually and solid solubility of Cr in Cu was extended with increasing milling time. The minimal crystallite size about 10 nm and the maximum solid solubility about 8.4 at% (i e, 7 wt%) were obtained at 60 h. The microstructure of ultrafine crystalline CuCr50 alloy was analyzed by SEM and TEM, which contains two kinds of size scale Cr particles of 2 μm and 50-150 nm, distributing homogeneously in matrix, respectively. The arc erosion characteristics of ultrafine crystalline CuCr50 alloy were investigated by the vacuum contact simulation test device in low D.C. voltage and low current (24 V/10 A). A commercial microcrystalline CuCr50 alloy was also investigated for comparison. Experiments indicate that the cathode mass loss of ultrafine crystalline CuCr50 contact material is higher than that of microcrystalline CuCr50 material, but its eroded surface morphology by the arc is uniform without obvious erosion pits. While the surface of microcrystalline CuCr50 contact is seriously eroded in local area by the arc, an obvious erosion pit occurred in the core part. Therefore, the ability of arc erosion resistance of ultrafine crystalline CuCr50 alloy is improved compared to that of microcrystalline CuCr50 material.