OXIDATION BEHAVIOR OF THE β-Nb PHASE PRECIPITATED IN Zr-2.5Nb ALLOY

被引：11

作者：

Li Qiang ^{[1
]}

Liang Xue ^{[1
]}

Peng Jianchao ^{[1
]}

Liu Renduo ^{[1
]}

Yu Kang ^{[1
]}

Zhou Bangxin ^{[1
]}

机构：

[1] Shanghai Univ, Lab Microstruct, Shanghai 200444, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2011年 / 47卷 / 07期

基金：

上海市自然科学基金; 国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

Zr-2.5Nb alloys; heat treatment; beta-Nb phase; crystal structure; ZR-XNB ALLOYS; CORROSION BEHAVIOR;

D O I：

10.3724/SP.J.1037.2011.00276

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The corrosion behavior for Zr-2.5Nb specimens heat-treated at 580 degrees C for 50 h after beta-quenching and cold rolling has been investigated in 500 degrees C /10.3 MPa superheated steam by autoclave tests. HRTEM equipped with EDS was employed to investigate the matrix microstructure and the oxidation behavior of the beta-Nb second phase particles (SPPs). It was found that many beta-Nb SPPs with small sizes (<100 nm) randomly precipitated after heat treating at 580 degrees C for 50 h. It was noted that the beta-Nb SPPs were more slowly oxidized than the zirconium matrix. The beta-Nb SPPs of bcc structure were oxidized to form the mixed structure of amorphous oxide and crystalline NbO2 at the initial oxidation stage, and then the amorphous phase was changed to the main structure at the middle oxidation stage, finally the niobium oxides were dissolved into the corrosion medium.

引用

页码：893 / 898

页数：6

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