摘要
利用ＳＥＭ原位观察了Ｚｒ４合金单调和循环变形过程中，试样表面滑移、裂纹萌生及扩展特征。结果表明：拉伸过程中，随着外应力增大，滑移程度加剧，从单滑移逐渐向多滑移转化；变形后期，扭折对维持材料变形协调性起很重要的作用；裂纹从试样内部萌生，穿透表面后，试样便很快断裂；疲劳过程中，多个裂纹在晶界附近萌生、扩展、并相互连接，导致试样最后失效；ＴＥＭ观察表明：典型的疲劳位错组态，横截面方向为双滑移形成的平行位错线；纵截面方向为初级位错胞。
Slippage, crack nucleation,
propagation are analyzed for zircaloy4 during monotonic and cyclic deformation by means of
insitu SEM observation. The results show that in the course of tension testing the slippage
becomes heavier, and changes from single slip to multiple slips as the applied stress
increases. Twist plays an important role in maintaining homogeneous deformation in the final
deformation stage. The specimen fracture occurs as soon as the cracks reach the specimen
surface. During cycling, a number of cracks nucleate, propagate and link in the vicinity of the
grain boundaries. TEM observation shows that a typical dislocation configuration is parallel
dislocation lines in transverse section and embryonic dislocation cells in longitudinal section.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1999年第2期97-100,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金
核工业科学基金
关键词
锆合金
原位观察
TEM
循环变形
单调变形
zircaloy4, monotonic and cyclic deformation, in situ observation
