摘要
应用透射电子显微镜研究了N18锆合金在室温下循环变形后的位错组态以及氢化物与位错的相互作用。结果表明,N18锆合金基体中存在着大量弥散分布的沉淀相粒子,其位错组态是一系列被沉淀相粒子钉扎住的位错线段。这些位错线段由{10 10}柱面滑移所产生。试样在变形过程中只有部分晶粒发生了塑性变形,而其它晶粒则是弹性变形。试样中的氢化物主要为面心立方结构的δ相氢化锆,氢化物与位错之间的交互作用存在着“尺寸效应”,位错的滑移能够切割过细小的氢化物,但不能穿越粗大的氢化物。
The dislocation configuration and the interaction between hydrides and dislocations of N18 Zircaloy after cyclic deformation at room temperature have been investigated, using transmission electron microscopy. The results show that there existed many dispersing precipitated particles in N18 Zircaloy, and that the dislocation configuration was characterized by dislocation lines pinned by precipitate particles which were formed by { 1010 } prismatic slip. In the process of deformation, only part of grains deformed plastically while the others were in elastic state. The hydrides in N 18 Zircaloy specimen were mainly composed of phase zirconium hydrides with F.C.C structure. Hydrides had a ＂size effect＂ on dislocation motion, i.e. the hydrides in small size could be cut open by dislocation slip while those in big size could not.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2006年第5期53-57,共5页
Nuclear Power Engineering
基金
核燃料及材料国家级重点实验室基金(51481020203ZS8501)
四川省杰出青年学科带头人培养基金(O3zQ026-051)资助
关键词
N18锆合金
沉淀相粒子
位错组态
柱面滑移
氢化物
N18 Zircaloy, Precipitated particles, Dislocation configuration, Prismatic slip, Hydrides
