利用ＳＥＭ原位观察了Ｚｒ－４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......

The welding joints of Zircaloy-4 plates obtained by diffusion welding at 800℃ under pressure in vacuum were cracked dur......