Microstructural characteristics of beta precipitates in Zr-1Nb alloy
Yuan, Gaihuan; Zhang, Lifeng; Yue, Qiang; Gu, Hengfei; Li, Geping; Shen, Jianyun;
AbstractThe 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.
description.department[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
KeywordAlloy Precipitation Phase Transitions Microstructure Interfaces
Funding OrganizationNational Science and Technology Major Project of the Ministry of Science and Technology of China [2011ZX06004-023]; National Natural Science Foundation of China [51071033]
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WOS IDWOS:000363818500013
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
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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.,...& 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.
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