Effect of withdrawal rate on microstructure and mechanical properties of a directionally solidified NiAl-based hypoeutectic alloy doped with trace Hf and Ho

IMR OpenIR

	Effect of withdrawal rate on microstructure and mechanical properties of a directionally solidified NiAl-based hypoeutectic alloy doped with trace Hf and Ho
	J. T. Guo; Y. Xie; L. Y. Sheng; L. Z. Zhou; Y. C. Liang
	2011
发表期刊	Intermetallics
ISSN	0966-9795
卷号	19 期号:2 页码:206-211
摘要	The hypoeutectic alloy, with nominal composition NiAl-31Cr-2.9Mo-0.1Hf-0.05Ho (at.%), was directionally solidified at three different withdrawal rates by liquid metal (Sn) cooling technique. Microstructural examination reveals that directional solidification gave rise to a shift in the coupled zone for the eutectic growth towards the Cr(Mo) phase. With the withdrawal rates increasing from 3 mm/min to 15 mm/min, the volume fraction of primary dendritic NiAl increases from 21.1% to 25.9%, while the size and the arm spacing of NiAl primary dendrite reduces simultaneously. The room temperature (RT) fracture toughness and the tensile strength at RT and elevated temperature (1373 K) present the valley value at intermediate rate (8 mm/min) among the withdrawal rate range which could be attributed to the decrease in volume fraction of eutectic NiAl/Cr(Mo) microstructure and the refinement of microstructure resulted from the increase of withdrawal rates. In terms of RT tensile elongation, the DS alloy grown at different withdrawal rates all break with no plastic flow. (C) 2010 Elsevier Ltd. All rights reserved.
部门归属	[guo, j. t.; sheng, l. y.; zhou, l. z.; liang, y. c.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [xie, y.] hunan elect power test & res inst, changsha 410007, hunan, peoples r china. [sheng, l. y.] peking univ, beijing 100871, peoples r china. [sheng, l. y.] pku hkust shenzhen hong kong inst, shenzhen 518057, peoples r china.;guo, jt (reprint author), chinese acad sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;jtguo@imr.ac.cn
关键词	Nickel Aluminides Based On Nial Mechanical Properties At Ambient Temperature Mechanical Properties At High temperAtures Crystal Growth Microstructure Temperature Fracture-toughness Rod-plate Transition In-situ Composites Eutectic Alloy Compressive Properties Deformation Strength Cr Systems Mo
URL	查看原文
WOS记录号	WOS:000286294500016
引用统计	被引频次：18[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/321006/30366
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. T. Guo,Y. Xie,L. Y. Sheng,et al. Effect of withdrawal rate on microstructure and mechanical properties of a directionally solidified NiAl-based hypoeutectic alloy doped with trace Hf and Ho[J]. Intermetallics,2011,19(2):206-211.
APA	J. T. Guo,Y. Xie,L. Y. Sheng,L. Z. Zhou,&Y. C. Liang.(2011).Effect of withdrawal rate on microstructure and mechanical properties of a directionally solidified NiAl-based hypoeutectic alloy doped with trace Hf and Ho.Intermetallics,19(2),206-211.
MLA	J. T. Guo,et al."Effect of withdrawal rate on microstructure and mechanical properties of a directionally solidified NiAl-based hypoeutectic alloy doped with trace Hf and Ho".Intermetallics 19.2(2011):206-211.