Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy
文献类型：期刊论文
| 作者 | H. T. Li ; J. T. Guo ; K. W. Huai ; H. Q. Ye |
| 刊名 | Journal of Crystal Growth
 |
| 出版日期 | 2006 |
| 卷号 | 290期号:1页码:258-265 |
| 关键词 | lamellar/rod-like transition morphological stability nucleation solubility rapid solidification rod-plate transition mechanical-properties electronic-structure growth-rate cr alloys toughness chromium strength nucleation interface |
| ISSN号 | 0022-0248 |
| 中文摘要 | The microstructure and room temperature compressive deformation behavior of a rapidly solidified NiAl-Cr(Mo)-Dy eutectic alloy fabricated by water-cooled copper mold method were studied by a combination of SEM, EDS and compressive tests. The morphology stability after hot isostatic pressing (HIP) treatment was evaluated. Rapid solidification resulted in a shift in the coupled zone for the eutectic growth towards the Cr(Mo) phase, indicating a hypoeutectic composition, hence increasing the volume fraction of primary dendritic NiAl. Meanwhile, significantly refined microstructure and lamellar/rod-like Cr(Mo) transition were observed due to trace rare earth (RE) element Dy addition and rapid solidification effects. Compared with the results in literature [H.E. Cline, J.L. Walter, Metall. Trans. 1(1970)2907-2917; P. Ferrandini, W.W. Batista, R. Caram, J. Alloys Comp. 381(2004)91-98], an interesting phenomenon, viz., NiAl halos around the primary Cr(Mo) dendrites in solidified NiAl-Cr(Mo) hypereutectic alloy, was not observed in this study. This difference was interpreted in terms of their different reciprocal nucleation ability. In addition, it was proposed that the localized destabilization of morphology after HIP treatment is closely related to the presence of primary NiAl dendrites. The improved mechanical properties can be attributed to the synergistic effects of rapid solidification and Dy addition, which included refined microstructure, suppression of the crack development along eutectic grain boundaries, enhancement of density of geometrically necessary dislocations located at NiAl/Cr(Mo) interfaces and the Cr solubility extension in NiAl. (c) 2006 Published by Elsevier B.V. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/34300]  |
| 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 | H. T. Li,J. T. Guo,K. W. Huai,et al. Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy[J]. Journal of Crystal Growth,2006,290(1):258-265. |
| APA | H. T. Li,J. T. Guo,K. W. Huai,&H. Q. Ye.(2006).Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy.Journal of Crystal Growth,290(1),258-265. |
| MLA | H. T. Li,et al."Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy".Journal of Crystal Growth 290.1(2006):258-265. |
入库方式： OAI收割
来源：金属研究所
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