Microstructure, precipitates and compressive properties of various holmium doped NiAl/Cr(Mo, Hf) eutectic alloys

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	Microstructure, precipitates and compressive properties of various holmium doped NiAl/Cr(Mo, Hf) eutectic alloys
	L. Y. Sheng; L. J. Wang; T. F. Xi; Y. F. Zheng; H. Q. Ye
	2011
发表期刊	Materials & Design
ISSN	0261-3069
卷号	32 期号:10 页码:4810-4817
摘要	The microstructure and mechanical properties of NiAl-28Cr-6Mo-0.2Hf eutectic alloys with various holmium additions have been investigated by using of SEM, TEM and compression test. The results reveal that minor Ho addition could optimize the microstructure by refining the lamella inside of eutectic cell and controlling the coarsening of intercellular region. However the minor Ho addition results in the Ni(2)Al(3)Ho phase, which has hexagonal crystal structure and an orientation relationship with NiAl phase of [1 2 0](Ni2Al3Ho)//[1 1 1](NiAl) and (0 0 $$(2) over bar)(Ni2Al3Ho)//(1 $(1) over bar $ 0)(NiAl). Moreover the Ni(17)Ho(2) phase is found in the Ni(2)Al(3)Ho phase, which has twin crystal inside and an orientation relationship with Ni(2)Al(3)Ho phase of [1 2 3](Al17Ho2)//[1 2 4](Ni2Al3Ho) and (1 1 $$(1) over bar)(Al17Ho2)//((2) over bar 1 0)(Ni2Al3Ho). In addition, the Ho addition promotes the precipitation of Ni(2)AlHf phase. More Ho addition coarsens the Cr(Mo) phases along the intercellular and results in more strengthening precipitates inside eutectic cell. When the Ho addition comes to 0.5 at.%, the alloy almost loses the cellular eutectic characteristic and exhibits a microstructure with coarse NiAl, massive Cr(Mo) and Ni(2)Al(3)HO phases. The microstructure optimizations improve the mechanical properties of the alloy significantly, especially the alloy with 0.1 at.% Ho content. (C) 2011 Elsevier Ltd. All rights reserved.
部门归属	[sheng, liyuan] pku hkust shenzhen hong kong inst, shenzhen 518057, peoples r china. [sheng, liyuan; xi, tingfei; zheng, yufeng] peking univ, beijing 100871, peoples r china. [wang, lijun] univ sci & technol beijing, sch met & ecol engn, beijing 100083, peoples r china. [ye, hengqiang] chinese acad sci, inst met res, shenyang 110016, peoples r china.;sheng, ly (reprint author), pku hkust shenzhen hong kong inst, shenzhen 518057, peoples r china;lysheng@yeah.net
关键词	Intermetallics Mechanical Properties Microstructure Mechanical-properties Magnetic-field Nial-cr Intermetallics
URL	查看原文
WOS记录号	WOS:000294373500018
引用统计	被引频次：57[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/321006/30653
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. Y. Sheng,L. J. Wang,T. F. Xi,et al. Microstructure, precipitates and compressive properties of various holmium doped NiAl/Cr(Mo, Hf) eutectic alloys[J]. Materials & Design,2011,32(10):4810-4817.
APA	L. Y. Sheng,L. J. Wang,T. F. Xi,Y. F. Zheng,&H. Q. Ye.(2011).Microstructure, precipitates and compressive properties of various holmium doped NiAl/Cr(Mo, Hf) eutectic alloys.Materials & Design,32(10),4810-4817.
MLA	L. Y. Sheng,et al."Microstructure, precipitates and compressive properties of various holmium doped NiAl/Cr(Mo, Hf) eutectic alloys".Materials & Design 32.10(2011):4810-4817.