Microstructure and phase stability studies on Heusler phase Ni2AlHf and G-phase Ni16Hf6Si7 in directionally solidified NiAl-Cr(Mo) eutectic alloyed with Hf

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	Microstructure and phase stability studies on Heusler phase Ni2AlHf and G-phase Ni16Hf6Si7 in directionally solidified NiAl-Cr(Mo) eutectic alloyed with Hf
	Y. X. Chen; C. Y. Cui; Z. Q. Liu; L. L. He; J. T. Guo; D. X. Li
	2000
发表期刊	Journal of Materials Research
ISSN	0884-2914
卷号	15 期号:6 页码:1261-1270
摘要	Small additions of Hf to directionally solidified NiAl-Cr(Mo) eutectic resulted in precipitation of a high density of Heusler phase Ni2AlHf along with fine G-phase Ni16Hf6Si7. The Heusler phase was mainly located on the grain boundary region. The fine G-phase formed in the presence of Si, which was a contamination resulting from contact with ceramic shell molds during directional solidification of the alloy. These fine G-phases were cuboidal in shape and coherent with the NiAl matrix. After hot isostatic pressing and aging treatment, the fine G-phases completely disappeared. The density of the Heusler phase was partially reduced, and the Heusler particles precipitated preferentially on the NiAl/Cr(Mo) interfaces and grain boundaries of the NiAl matrix. Some Heusler particles precipitated locally within the NiAl matrix, and small amounts of them precipitated within the Cr(Mo) phase. The structures of the NiAl/Ni2AlHf and NiAl/Ni16Hf6Si7 interfaces were investigated by high-resolution electron microscopy. The habit plane of the fine G-phase was {001}(NiAl). This result was in good agreement with calculation based on the linear elastic theory. The misfit dislocation network on the NiAl/Ni2AlHf ((1) over bar 10) interface was calculated from the O-lattice model and compared with the observation, which showed good agreement.
部门归属	chinese acad sci, inst met res, atom imaging solids lab, shenyang 110015, peoples r china. dalian maritime univ, inst mat & technol, dalian, peoples r china.;chen, yx (reprint author), chinese acad sci, inst met res, atom imaging solids lab, shenyang 110015, peoples r china
关键词	Rod-plate Transition Mechanical-properties Mgo Interfaces Nial-cr Creep
URL	查看原文
WOS记录号	WOS:000087382200010
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37005
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. X. Chen,C. Y. Cui,Z. Q. Liu,et al. Microstructure and phase stability studies on Heusler phase Ni2AlHf and G-phase Ni16Hf6Si7 in directionally solidified NiAl-Cr(Mo) eutectic alloyed with Hf[J]. Journal of Materials Research,2000,15(6):1261-1270.
APA	Y. X. Chen,C. Y. Cui,Z. Q. Liu,L. L. He,J. T. Guo,&D. X. Li.(2000).Microstructure and phase stability studies on Heusler phase Ni2AlHf and G-phase Ni16Hf6Si7 in directionally solidified NiAl-Cr(Mo) eutectic alloyed with Hf.Journal of Materials Research,15(6),1261-1270.
MLA	Y. X. Chen,et al."Microstructure and phase stability studies on Heusler phase Ni2AlHf and G-phase Ni16Hf6Si7 in directionally solidified NiAl-Cr(Mo) eutectic alloyed with Hf".Journal of Materials Research 15.6(2000):1261-1270.