DEUTERIUM DISTRIBUTIONS ON DELAYED HYDRIDE CRACK FRACTURE SURFACES OF ZR-2.5NB

被引：1

作者：

LAURSEN, T ^{[1
]}

PALMER, GR ^{[1
]}

SHEK, GK ^{[1
]}

机构：

[1] ONTARIO HYDRO,TECHNOL,TORONTO,ON,CANADA

来源：

JOURNAL OF NUCLEAR MATERIALS | 1995年 / 218卷 / 02期

关键词：

D O I：

10.1016/0022-3115(94)00403-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Delayed hydride cracking (DHC) fracture surfaces on unirradiated Zr-2.5Nb pressure tube material have been characterized by nuclear reaction analysis (NRA). Although the fracture surface is rough and oxidized, NRA was able to detect the deuteride on the surface and to determine an average deuteride thickness. This thickness, which represents half of the fractured hydride thickness, was 1 mu m in the case of a specimen containing an average D concentration of 68 wppm and fractured at 517-525 K. On a specimen selected for its large ligament zones, D distributions on a tunnelled DHC crack was compared to those on the adjacent ligament zones. The hydriding of these ligament zones - in spite of their different appearance - is consistent with fracture by a DHC mechanism.

引用

页码：210 / 216

页数：7

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