THE EFFECT OF PLASTIC DEFORMATION ON SELF-DIFFUSION IN NICKEL. Third Technical Report Series 114, Issue No. 3
Technical Report
·
OSTI ID:4064663
The coefficient of- self-diffusion in nickel single crystals in the unstrained state, D/sub u/, is found to be a function of temperature and is represented by the following equation: D/sub u/ = 1.9 exp STA-(66,8OO/RT)!(cm/sup 2//sec). When D/sub u/ undergoes plastic deformation (tensile) from 0.0085 to 0.055 hr/sup -//sup 1/ at 948 plus or minus 1.5 deg K and 1021 plus or minus 1.5 deg K, it is found that the coefficient of self-diffusion increased with an increase in strain rate at a constsnt temperature and decreased with an increase in temperature at constant strain rate. These results are discussed in terms of a model which assumes that vacancies are produced by the motion of jogged screw dislocations and the thermally activated climb of edge dislocations snd that vacancies anneal by migrating to fixed sinks, dislocation lines. The analysis indicates that the motion of jogged screws may be an unimportant source for vacsncies at these temperatures snd strain rates. (auth)
- Research Organization:
- California. Univ., Berkeley. Materials Research Lab.
- NSA Number:
- NSA-15-019853
- OSTI ID:
- 4064663
- Report Number(s):
- NP-10255
- Country of Publication:
- United States
- Language:
- English
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