Microstructure and homogeneity of nanocrystalline Co-Cu supersaturated solid solutions prepared by mechanical alloying
文献类型：期刊论文
| 作者 | J. Y. Huang ; Y. D. Yu ; Y. K. Wu ; D. X. Li ; H. Q. Ye |
| 刊名 | Journal of Materials Research
 |
| 出版日期 | 1997 |
| 卷号 | 12期号:4页码:936-946 |
| 关键词 | cobalt transformation solubility palladium powders metals limits hrem |
| ISSN号 | 0884-2914 |
| 中文摘要 | Mechanical alloying (MA) has been performed in the Co,Cu-x((100-x)) (x = 10, 25, 50, 60, 75, and 90) system. High resolution electron microscopy (HREM) and field emission gun transmission electron microscopy (FEG TEM) were used to characterize the microstructure and homogeneity of the nanocrystalline Co25Cu75 solid solution. After 20 h of MA, all the mixtures show an entirely face-centered cubic (fee) phase. HREM shows that the ultrafine-grained (UFG) materials prepared by MA contain a high density of defects. Two kinds of typical defects in UFG Co25Cu75 are deformation twins and dislocations. The dislocations are mostly 60 degrees type, and in many cases they dissociate into 30 degrees and 90 degrees partials. The grain boundaries are ordered in structure, curved, and slightly strained, which is similar to that observed in NC-Pd. Nanoscale energy dispersive x-ray spectroscopy (EDXS) shows that the Co concentration in both the interior of grains and the GB's is close to the global composition, which proves that supersaturated solid solutions are indeed formed. In the meantime EDXS revealed that the mixing of Co and Cu in the solid solutions is homogeneous at nanometer scale. MA in the Co-Cu system is suggested to be a diffusion-controlled process, and stress-stimulated diffusion is proposed to be the reason for the formation of supersaturated solid solutions in this immiscible system. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/37979]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | J. Y. Huang,Y. D. Yu,Y. K. Wu,et al. Microstructure and homogeneity of nanocrystalline Co-Cu supersaturated solid solutions prepared by mechanical alloying[J]. Journal of Materials Research,1997,12(4):936-946. |
| APA | J. Y. Huang,Y. D. Yu,Y. K. Wu,D. X. Li,&H. Q. Ye.(1997).Microstructure and homogeneity of nanocrystalline Co-Cu supersaturated solid solutions prepared by mechanical alloying.Journal of Materials Research,12(4),936-946. |
| MLA | J. Y. Huang,et al."Microstructure and homogeneity of nanocrystalline Co-Cu supersaturated solid solutions prepared by mechanical alloying".Journal of Materials Research 12.4(1997):936-946. |
入库方式： OAI收割
来源：金属研究所
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