Strengthening mechanism of Nb addition in Fe-13Cr-4.5Al-2Mo alloys assessed by internal friction measurement

doi:10.1016/j.jnucmat.2020.152461

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	Strengthening mechanism of Nb addition in Fe-13Cr-4.5Al-2Mo alloys assessed by internal friction measurement
	H. Wang 1; Y.X. Gao 2; M. Sun 2; H.Y. Yang 1; G. Li 1; K. He 1; X.P. Wang 2; W.B. Jiang 2; Q.F. Fang 2
刊名	Journal of Nuclear Materials
	2020-08-11
卷号	542
关键词	FeCrAlMo-Nb alloys Internal friction Grain boundary relaxation Laves phase Pinning effect Strengthening mechanism
ISSN号	0022-3115
DOI	10.1016/j.jnucmat.2020.152461
通讯作者	Gao, Y. X.(yxgao@issp.ac.cn) ; Jiang, W. B.(wbjiang@issp.ac.cn)
英文摘要	The Fe-13Cr-4.5Al-2Mo (FeCrAlMo) alloys, one of the most promising candidates for the accident tolerant fuel cladding in the light-water reactors, were strengthened with Nb addition and the strengthening mechanism were assessed by an internal friction (IF) measurement method combined with microstructure characterization. The FeCrAlMo alloy with 1.0 wt% Nb addition exhibited the highest ultimate tensile strength (UTS) and an acceptable ductility at each tested temperature (room temperature, 300 degrees C or 700 degrees C). For example at 700 degrees C, the UTS of FeCrAlMo - 1 wt%Nb was about 215 MPa, which was 53.5% higher than that of Nb-free FeCrAlMo alloy. For Nb-free FeCrAlMo alloy, a high IF peak P-2 appeared at about 680 degrees C was related to the recovery and recrystallization process during the first heating cycle, which was characterized by an internal friction measurement method. Another small IF peak P-1 corresponding to Zener relaxation process and a predominant IF peak P-3 corresponding to the grain boundary relaxation process were observed at 560 degrees C and 720 degrees C, respectively, during the second heating cycle. However none of IF peaks was detected for the Nb containing FeCrAlMo alloys up to 800 degrees C. Based on the IF theory, the disappearance of P-1 (Zener peak), P-2 (recrystallization peak) and P-3 (grain boundary peak) in the first and second heating cycles was owing to the pinning of dislocations and grain boundaries by high density Fe2Nb nanoscale particles dispersed in the FeCrAlMo matrix, which enhanced the tensile strength of the Nb containing FeCrAlMo alloys. (C) 2020 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[51801194] ; National Natural Science Foundation of China[51971207] ; National Natural Science Foundation of China[U1904194]
WOS关键词	CLADDING CANDIDATE MATERIALS ; HIGH-TEMPERATURE ; ZENER RELAXATION ; PHASE ; STABILITY ; OXIDATION ; PROPERTY ; MO
WOS研究方向	Materials Science ; Nuclear Science & Technology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000583242500021
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/76158]
专题	合肥物质科学研究院_中科院固体物理研究所
通讯作者	Y.X. Gao; W.B. Jiang
作者单位	1.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China 2.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, Sichuan 610041, China,
推荐引用方式 GB/T 7714	H. Wang,Y.X. Gao,M. Sun,et al. Strengthening mechanism of Nb addition in Fe-13Cr-4.5Al-2Mo alloys assessed by internal friction measurement[J]. Journal of Nuclear Materials,2020,542.
APA	H. Wang.,Y.X. Gao.,M. Sun.,H.Y. Yang.,G. Li.,...&Q.F. Fang.(2020).Strengthening mechanism of Nb addition in Fe-13Cr-4.5Al-2Mo alloys assessed by internal friction measurement.Journal of Nuclear Materials,542.
MLA	H. Wang,et al."Strengthening mechanism of Nb addition in Fe-13Cr-4.5Al-2Mo alloys assessed by internal friction measurement".Journal of Nuclear Materials 542(2020).