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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
Corresponding AuthorDu, XH(xinghaodu@yahoo.com)
2005-09-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume21Issue:5Pages:635-640
AbstractA 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.
KeywordNiAl / Cr(Mo, Hf) alloys microstructure mechanical properties tensile deformation creep behavior
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000232316600006
PublisherJOURNAL MATER SCI TECHNOL
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82672
Corresponding AuthorDu, XH
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Shenyang Inst Aeronaut Engn, Dept Mat Engn, Shenyang 110034, Peoples R China
Recommended Citation
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.
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