OXIDATION BEHAVIOR OF THE β-Nb PHASE PRECIPITATED IN Zr-2.5Nb ALLOY
LI Qiang, LIANG Xue, PENG Jianchao, LIU Renduo, YU Kang, ZHOU Bangxin
Laboratory for Microstructures, Shanghai University, Shanghai 200444
Cite this article:
LI Qiang LIANG Xue PENG Jianchao LIU Renduo YU Kang ZHOU Bangxin. OXIDATION BEHAVIOR OF THE β-Nb PHASE PRECIPITATED IN Zr-2.5Nb ALLOY. Acta Metall Sin, 2011, 47(7): 893-898.
Abstract 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.
Supported by National Natural Science Foundation of China (Nos.50871064 and 50971084), National High Technology Research and Development Program of China (No.2008AA031701), Natural Science Foundation of Shanghai (No.09ZR1411700) and Shanghai Leading Academic Discipline Project (No.S30107)
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