Zr-2.5Nb合金经β相水淬、冷轧变形及580 ℃, 50 h退火处理, 在静态高压釜中进行500 ℃/10.3 MPa 的过热蒸汽腐蚀实验. HRTEM观测表明, 580 ℃, 50 h退火处理的锆合金析出了颗粒细小(<100 nm)的β-Nb第二相, 其数量较多, 分布较均匀. β-Nb相的氧化速率比锆合金基体缓慢, 在氧化过程中首先生成NbO2, 呈现晶态和非晶态的混合组织, 然后转变成非晶态占主导的氧化物, 最后流失到腐蚀介质中.
The corrosion behavior for Zr--2.5Nb specimens heat--treated at 580 ℃ for 50 h after $\beta$--quenching
and cold rolling has been investigated in 500 ℃/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 ℃ 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 NbO$_{2}$ 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.
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