Mechanical properties of DS NiAl/Cr(Mo) alloys with low addition of Hf for high-temperature applications

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	Mechanical properties of DS NiAl/Cr(Mo) alloys with low addition of Hf for high-temperature applications
	Du, XH ; Guo, JT
通讯作者	Du, XH(xinghaodu@yahoo.com)
	2005-09-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	21 期号:5 页码:635-640
摘要	A multiphase NiAl-28Cr-5.85lVlo-0.15Hf alloy, which was directionally solidified (DS) in an Al2O3-SiO2 mold by standard Bridgman method and then underwent prolonged solution and aging treatment was prepared. The microstructure, tensile properties as well as tensile creep of the heat-treated alloy at different temperatures were studied. The alloy was composed of NiAl, Cr(Mo) and Hf-rich phase and small amount of fine Heusler phase (Ni2AlHf). Although the present alloy exhibited high tensile strength at low temperature, it was weaker than that of system with high content Hf but still stronger than that of many NiAl-based alloys at high temperatures. The fracture toughness is lower than that of DS NiAl-28Cr-6Mo alloy. Nevertheless, advantageous effects on the mechanical properties, i.e. the decrease in brittle-to-ductile transition temperature (BDTT) were obtained for the low content of Hf. The obtained creep curves exhibit conventional shape: a short primary creep and long accelerated creep stages. The rupture properties of the heat-treated alloy follow the Monkman-Grant relationship, which exhibits similar creep behavior to that of NiAl/Cr(Mo) system with high Hf content.
关键词	NiAl / Cr(Mo, Hf) alloys microstructure mechanical properties tensile deformation creep behavior
收录类别	SCI
语种	英语
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000232316600006
出版者	JOURNAL MATER SCI TECHNOL
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/82672
通讯作者	Du, XH
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Shenyang Inst Aeronaut Engn, Dept Mat Engn, Shenyang 110034, Peoples R China
推荐引用方式 GB/T 7714	Du, XH,Guo, JT. Mechanical properties of DS NiAl/Cr(Mo) alloys with low addition of Hf for high-temperature applications[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2005,21(5):635-640.
APA	Du, XH,&Guo, JT.(2005).Mechanical properties of DS NiAl/Cr(Mo) alloys with low addition of Hf for high-temperature applications.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,21(5),635-640.
MLA	Du, XH,et al."Mechanical properties of DS NiAl/Cr(Mo) alloys with low addition of Hf for high-temperature applications".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 21.5(2005):635-640.