Annihilation of persistent slip bands and its effect on the fatigue life of copper single crystals |
| |
| Authors: | S. X. Li § M. Y. Li R. Zhu Y. S. Chao |
| |
| Affiliation: | 1. Shenyang National Laboratory for Materials Science , Institute of Metal Research, The Chinese Academy of Sciences , Shenyang 110016, China;2. Shenyang National Laboratory for Materials Science , Institute of Metal Research, The Chinese Academy of Sciences , Shenyang 110016, China;3. Department of Materials Physics , Northeastern University , Shenyang 110004, China;4. Department of Materials Physics , Northeastern University , Shenyang 110004, China |
| |
| Abstract: | In single-slip-oriented copper single crystals, which were cyclically deformed under constant plastic shear strain amplitude control, a persistent slip band (PSB) was initiated on the persistent slip line (PSL) that first formed in the matrix vein dislocation structure. During intermediate temperature recovery (ITR) treatment in vacuum at 245 to 400°C, the variations in dislocation configurations and other defects of fatigued specimens were studied by using the scanning electron microscopy (SEM) electron channelling contrast (ECC) and the positron annihilation life (PAL) techniques. The results show that the ladders in the PSBs became curved and broken, or escaped locally until the PSBs disappeared completely during ITR treatment. The annihilation of the PSBs and other dislocation structures in the fatigued specimens prolonged the fatigue life to a certain extent. |
| |
| Keywords: | |
|
|
