An enhanced hydrogen corrosion by the Ti(C,N) inclusions in U-0.79 wt%Ti alloy

被引：7
|
作者：
Li, Fangfang [1 ]
Lu, Lei [1 ]
Meng, Xiandong [1 ]
Xiao, Hong [1 ]
Ji, Hefei [1 ]
Zeng, Rongguang [1 ]
Zhang, Xinjian [1 ]
Wang, Xiaolin [1 ]
Zhao, Yawen [1 ]
Shi, Peng [1 ]
机构：
[1] China Acad Engn Phys, Mianyang 621900, Sichuan, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 820卷
基金：
美国国家科学基金会;
关键词：
U-0.79 wt%Ti alloy; Inclusions; Composition; Microstructure; Hydride; Nucleation sites; URANIUM METAL; C-N; SURFACE; SITES; MICROSTRUCTURE; NUCLEATION; INITIATION; KINETICS; BEHAVIOR; HYDRIDES;
D O I：
10.1016/j.jallcom.2019.153124
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 chemical composition and microstructure of main inclusions in U-0.79 wt%Ti alloy were investigated by Scanning Augur electron spectroscopy (SAM) and High resolution scanning transmission electron microscopy (HRSTEM). SAM analysis showed the predominant inclusion in U-0.79 wt%Ti alloy was in the form of titanium carbonitrides. HRSTEM showed the high resolution atom image of titanium carbonitride inclusion and further verified the phase structure of titanium carbonitride inclusion was Ti(C,N). The after-hydriding analysis showed that the hydrogen attack preferentially occurred around most of the Ti(C,N) inclusions in U-0.79 wt%Ti alloy, the initial hydride growth showed a parabolic-like kinetic behavior with a reaction order of 0.6. The inclusion-oxide interface can act as preferential transport channel for hydrogen to reach the metal. (C) 2019 Elsevier B.V. All rights reserved.
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页数：6
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