Composition dependence of the precipitation behavior in NiAl-Cr(Mo)-(Ti,Hf) near eutectic alloys

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	Composition dependence of the precipitation behavior in NiAl-Cr(Mo)-(Ti,Hf) near eutectic alloys
	H. T. Li; H. T. Guo; H. Q. Ye
	2007
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	452 页码:763-772
摘要	Influence of Ti and Hf combined additions on the Ni2AlX (X=Ti,Hf) Heusler phase precipitation in as-cast NiAl-Cr(Mo) eutectics was investigated by XRD, SEM and TEM observation. The results show that with the increasing of Ti content, the Ni2Al(Ti,Hf) precipitation with blocky morphology at NiAl/Cr(Mo) interface and cellular boundary is nearly suppressed; however, this precipitation with cuboidal or granular morphology within the NiAl matrix promoted. The mechanisms of this transition of precipitation behavior are attributed to the decrease of interfacial energies due to the coherency between NiAl and Heusler phase Ni2Al(Ti,Hf) with the increasing of Ti addition. The size of Ni2Al(Ti,Hf) coherent precipitates inside the NiAl matrix decreased progressively with the increasing of Ti content in NiAl phase, showing a Gibbs-Thomson relation-like trend. In addition, another (Ti,Hf) solid solution phase along with the Ni2Al(Ti,Hf) precipitates was observed for lower Ti addition alloys, which is the precipitation from NiAl matrix prior to Ni2Al(Ti,Hf) precipitation. This may be ascribed to the fast formation kinetics of (Ti,Hf) solid solution phase relative to the Ni2Al(Ti,Hf) phase for lower level Ti-containing alloys. (c) 2006 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, met res inst, superalloys div, shenyang 110016, peoples r china. chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china.;guo, ht (reprint author), chinese acad sci, met res inst, superalloys div, shenyang 110016, peoples r china;hutian_li@126.com jtguo@imr.ac.cn
关键词	Nial-based Alloys Ni2al(Ti Heusler Phase Precipitates Hf) Lattice Misfit Mechanical-properties Single-crystals Creep-behavior Temperature Deformation Additions
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WOS记录号	WOS:000245639800104
引用统计	被引频次：13[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/321006/33632
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. T. Li,H. T. Guo,H. Q. Ye. Composition dependence of the precipitation behavior in NiAl-Cr(Mo)-(Ti,Hf) near eutectic alloys[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2007,452:763-772.
APA	H. T. Li,H. T. Guo,&H. Q. Ye.(2007).Composition dependence of the precipitation behavior in NiAl-Cr(Mo)-(Ti,Hf) near eutectic alloys.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,452,763-772.
MLA	H. T. Li,et al."Composition dependence of the precipitation behavior in NiAl-Cr(Mo)-(Ti,Hf) near eutectic alloys".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 452(2007):763-772.