Microstructural characteristics of beta precipitates in Zr-1Nb alloy

IMR OpenIR

	Microstructural characteristics of beta precipitates in Zr-1Nb alloy
	Yuan, Gaihuan; Zhang, Lifeng; Yue, Qiang; Gu, Hengfei; Li, Geping; Shen, Jianyun; gpli@imr.ac.cn
	2015
发表期刊	MATERIALS CHEMISTRY AND PHYSICS
ISSN	0254-0584
卷号	165 页码:87-90
摘要	The beta phase precipitates in a Zr-1Nb alloy annealed at 600 degrees C and 700 degrees C (below and above the monotectoid temperature, respectively) for 3 h were investigated by transmission electron microscopy. It was found that the uniformly distributed beta phase obtained at 600 degrees C was spherical, with diameter of 30 -60 nm, volume fraction of similar to 2.5% and Nb content of similar to 68 wt.%. However, the 0 phase obtained at 700 degrees C was stick-shaped, with similar to 100 nm in diameter and similar to 300 nm in length, volume fraction of similar to 9.8% and Nb content similar to 10 wt.%. The distinctions in volume fractions and compositions were consistent with the lever rule of the Zr-Nb phase diagram. The distinction in shapes resulted from the change in the interfacial structure, which depended on the lattice misfit. The orientation relationship between a matrix and stick-shape beta precipitates satisfied Burgers' orientation relationship, i.e., (10 (1) over bar 0)(alpha)//(1 (1) over bar 2)(beta) for the broad face, (0001)(alpha)//1(110)(beta) for the side facet and (11 (2) over bar 0)(alpha)//((1) over bar 11)(beta) for the edge. The outline of the stick-shaped beta precipitates was composed of straight and curved interfaces, and the broad faces and side facets together formed the straight interface, and the edges formed the curved one. As the Nb content of beta phase increased, the lattice misfits on broad face and side facet increased and their interfacial structures changed from coherent (obtained at 700 degrees C) into incoherent (obtained at 600 degrees C), and the misfits of edge decreased, and their interfacial structures were always incoherent for the two heat treatments. Therefore, the curved interfaces had a higher growth rate than the straight interfaces at 700 degrees C and stick-like beta phase precipitate was formed. While the three planes have a comparable growth rate at 600 degrees C and spherical beta phase precipitate was formed. (C) 2015 Elsevier B.V. All rights reserved.
部门归属	[yuan, gaihuan] univ bolton, bolton bl3 5a8, england ; [yuan, gaihuan ; yue, qiang] state nucl bao ti zirconium ind co, baoji 721013, peoples r china ; [zhang, lifeng ; gu, hengfei ; li, geping] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [shen, jianyun] gen res inst nonferrous met, beijing 100088, peoples r china
关键词	Alloy Precipitation Phase Transitions Microstructure Interfaces
资助者	National Science and Technology Major Project of the Ministry of Science and Technology of China [2011ZX06004-023]; National Natural Science Foundation of China [51071033]
收录类别	sci
语种	英语
WOS记录号	WOS:000363818500013
引用统计	被引频次：10[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/321006/74967
专题	中国科学院金属研究所
通讯作者	gpli@imr.ac.cn
推荐引用方式 GB/T 7714	Yuan, Gaihuan,Zhang, Lifeng,Yue, Qiang,et al. Microstructural characteristics of beta precipitates in Zr-1Nb alloy[J]. MATERIALS CHEMISTRY AND PHYSICS,2015,165:87-90.
APA	Yuan, Gaihuan.,Zhang, Lifeng.,Yue, Qiang.,Gu, Hengfei.,Li, Geping.,...&gpli@imr.ac.cn.(2015).Microstructural characteristics of beta precipitates in Zr-1Nb alloy.MATERIALS CHEMISTRY AND PHYSICS,165,87-90.
MLA	Yuan, Gaihuan,et al."Microstructural characteristics of beta precipitates in Zr-1Nb alloy".MATERIALS CHEMISTRY AND PHYSICS 165(2015):87-90.