THE PORTION OF VACANCY AND INTERSTITIALCY ENHANCEMENT OF DIFFUSION DURING IRRADIATION
For the determination of the contribution of vacancies and interstitials to the increase of the degree of ordering during irradiation from the results of investigations of radiation enhanced diffusion the migration activation energies of vacancies and interstitials must be known. In the case of copper - zinc alloys the migration activation energy of vacancies and of interstitials are EM-1V = 1.0 and EM-1V = 0.7 eV, respectively, and the activation energy of ordering during irradiation of 2 MeV electrons of a flux of 0.04 /uAcm**-2 is 0.34 EV. This finding is compatible with 2Q-irr. = EM-1I assuming that vacancies and interstitials annihilate mainly by pair recombination and that interstitials are rate determining for the ordering process during irradiation. In copper - aluminium alloys EM-1V is only slightly larger than EM-1I and B is found to be 1/30. In gold - silver alloys this factor is about 1/60, and in gold - copper alloys 1/600. This means that interstitials are hardly able to contribute to the ordering process during irradiation in copper - gold alloys and it is only due to the fact that Em-1V is much larger than EM-1I that their contribution is noticeable and can be determined.
Bibliographic Reference: VACANCIES AND INTERSTITIALS IN METALS AND ALLOYS, BERLIN (GERMANY), SEPT. 14-19, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32769 ORA
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Record Number: 1989125059500 / Last updated on: 1987-11-01
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