Effect of yttrium addition on microstructure and orientation of hydride precipitation in Zr-1Nb alloy

被引：11
作者：
Chen, Lili [1 ]
Wang, Xitao [1 ]
Gong, Weijia [1 ]
Zhang, Hailong [1 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2014年 / 39卷 / 36期
关键词：
Zr-1Nb; Hydrogen absorption; Crystallographic orientation relationship; Yttrium addition; ZIRCONIUM ALLOYS; HYDROGEN CONTENT; ZIRCALOY-4; GROWTH; NB; EMBRITTLEMENT; DEGRADATION;
D O I：
10.1016/j.ijhydene.2014.10.098
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The purpose is to investigate the role of yttrium addition in improving hydride embritdement resistance in Zr-1Nb alloy, because yttrium addition has been widely used to improve oxidation resistance of alloys. The results suggest that 0.2 wt.% yttrium addition can effectively lower hydrogen absorption in Zr-1Nb alloy. The microstructural characterization shows that the precipitated hydrides are interlinked to have a width of 200 -600 nm and a shape of lamellar or "dendritic". The electron backscattered diffraction (EBSD) results show that the crystallographic orientation relationship between precipitated hydrides and zirconium matrix is (0001)alpha-Zr//{111}delta-H0.62Zr0.38 or (0001)alpha-Zr//{100}delta-H0.62Zr0.38, depending on the position and morphology of hydrides. The depression of hydrogen absorption is attributed to the reduction of transgranular hydride precipitation by yttrium addition. This study provides an experimental basis for designing new zirconium alloys with enhanced hydrogen absorption resistance. Copyright (c) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：21116 / 21126
页数：11
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