王赫男
,
李瑛
,
王福会
腐蚀科学与防护技术
利用磁控溅射技术制备了晶粒尺寸为300 nm~400 nm的 GW102K (Mg-10Gd-2Y-0.5Zr)微晶薄膜.通过动电位极化曲线和电化学阻抗谱(EIS)研究微晶薄膜在0.2 mol/L Na2SO4水溶液中的腐蚀行为. 极化曲线结果表明, 微晶化加速GW102K靶材合金的阴极过程, 而抑制其阳极过程. EIS结果表明, 微晶化降低GW102K靶材合金在自腐蚀电位下的转移电阻和腐蚀产物膜电阻, 从而降低其耐蚀性.微晶化提供大量的晶粒边界, 氢原子通过晶粒边界快速扩散, 生成氢化物, 从而加速GW102K靶材合金的阴极反应速率. 此外, 微晶化促进金属的阳极溶解, 使微晶薄膜表面形成大量均匀的腐蚀产物, 从而抑制金属的进一步溶解.
关键词:
Mg-10Gd-2Y-0.5Zr
,
microcrystalline (MC) film
,
corrosion behavior
,
hydrides
,
magnetron sputtering
ZHOU Bangxin ZHENG Sikui WANG Shunxin Southwest Centre for Nuclear Reactor Engineering Research and Design
,
Chengdu
,
China [Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp A190—A195
,
Southwest Centre for Nuclear Reactor Engineering Research and Design
,
Chengdu
,
China
金属学报(英文版)
The precipitation process of zirconium hydrides induced by stress and strain was investigated by means of electron microscopy in-situ.The precipitating hydrides induced by stress were found to be γ phase with orientation relationship of (110)_γ‖(110)_(αZr),(001)_γ‖ (0001)_(αZr) between γ-hydrides and surrounding matrix.The growth rate of γ-hydrides which was much faster along [110] direction brought them in taper shape.After fracture of y-hydrides,a new one will precipitate at the tip of cracks.This is the essential process of hydrogen-induced delayed cracking in Zircaloy.The precipitating hydrides induced by strain were found to be δ phase with both orientation relationships of(111)_δ‖(0001)_(αZr),(110)_δ‖ (110)_(αZr) or (010)_δ‖(0001)_(αZr),(001)_δ‖(110)_(αZr)between δ-hydride and surrounding matrix.The δ-hydrides become much finer as the strain rate increased.
关键词:
Zircaloy-2
,
null
,
null
,
null
