BDT and creep behaviors of NiAl-25 at. pct Cr alloy at various temperatures

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	BDT and creep behaviors of NiAl-25 at. pct Cr alloy at various temperatures
	G. Y. Mang; X. H. Du; J. T. Guo; H. Q. Ye
	2005
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	21 期号:5 页码:641-646
摘要	Brittle-to-ductile transition (BDT) behavior and creep behavior of extruded NiAl-25Cr alloy at elevated temperatures were investigated. The results reveal that the alloy exhibits obvious BDT behavior with the increase in temperature and BDT temperature (BDTT) is sensitive to initial strain rate. When the initial strain rate increases by two orders of magnitude, BDTT has an increase of approximate 80 K. The creep data in the temperature range of 1073 similar to 1123 K reveal two distinct regions of creep behavior in this material. At lower temperature, the creep characteristics are consistent with structural controlled creep process where creep deformation is controlled by dislocation climb. At higher temperature, the creep characteristics are consistent with mobility-controlled deformation where viscous glide of dislocations controls creep. The apparent activation energy determined by creep in both regions exceeds the value for lattice self-diffusion in NiAl by a considerable amount. This can be explained in terms of the simultaneous deformation of second phase particles (gamma '-Ni3Al and alpha-Cr phase) along NiAl matrix during creep.
部门归属	chinese acad sci, inst met res, shenyang 110016, peoples r china.;guo, jt (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;jtguo@imr.ac.cn
关键词	Nial Intermetallics Mechanical Properties Brittle-to-ductile Transition Creep
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WOS记录号	WOS:000232316600007
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34980
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. Y. Mang,X. H. Du,J. T. Guo,et al. BDT and creep behaviors of NiAl-25 at. pct Cr alloy at various temperatures[J]. Journal of Materials Science & Technology,2005,21(5):641-646.
APA	G. Y. Mang,X. H. Du,J. T. Guo,&H. Q. Ye.(2005).BDT and creep behaviors of NiAl-25 at. pct Cr alloy at various temperatures.Journal of Materials Science & Technology,21(5),641-646.
MLA	G. Y. Mang,et al."BDT and creep behaviors of NiAl-25 at. pct Cr alloy at various temperatures".Journal of Materials Science & Technology 21.5(2005):641-646.