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The low temperature FIM isochronal annealing spectrum of 4 different 4 4 purity levels of tungsten (resistivity ratios R of 5*10 , 1.5*10 , 50 and 15) + 12 -2 irradiated in-situ with 30keV W ions to a dose of 5*10 ion cm at 18K consisted of distinct recovery peaks at ̂ 38, 50, 65 and 80K with a small amount of recovery observed up to 120K. The spectra for these 4 different R value specimens were essentially identical between 18 and 120K. A fifth group of W specimens with R=5 began to exhibit some deviations from the standard spectrum. This result indicates that the distribution of self-interstitial atoms (SIA's) produced by the ion irradiations in the W FIM tips was such that the SIA-SIA reaction dominated the recovery behavior. The isochronal peak width at half-maximum for the 38K longrange SIA migration peak and the Stage II peaks in pure W were shown to be approximately equal to the value predicted by a diffusion model. The isochronal recovery spectra for tungsten-0.5 at.% and 3 at.% rhenium alloys were radically different from the isochronal recovery spectra of pure W. For both W-(Re) alloys the amount of recovery for the long-range migration peak was suppressed and for the 3 at.% Re alloy it was almost eliminated. This result constitutes evidence for the formation Research supported by the United States Atomic Energy Commission. Additional support was received from the National Science Foundation through the use of the technical facilities of the Materials Science Center at Cornell University. § Now at: Sandia Laboratories, Li>rermore, California 94550. + Cornell University, Bard Hall, Department of Materials Science and Engineering and the Materials Science Center, Ithaca, New York 14853. of tightly bound immobile SIA-Re complexes during the long-range migration sub4 stage at 38K which suppress the SIA-SIA reaction. High-purity W (R=5*10 ) doped with 50-100 appm carbon showed a 20% reduction in the amount of recovery observed for the long-range migration peak at 38K. The substage II peak at V>0K grew at the expense of the 38K peak. This result constitutes evidence for the formation of SIA-carbon atom complexes during the long-range migration peak at V38K. An analysis of the SIA contrast patterns detected in the isochronal anneals indicated that some form of SIA clustering must have occured below 120K 13 + -2 (Stage II). Preliminary high dose (5-10 W ion cm ) experiments also exhibited a suppression of the 38K peak and indicated that more SIA clustering was occuring 12 -2 than in the low dose (5*10 ion cm ) experiments.

An in-situ field ion microscope study of irradiated tungsten and tungsten alloys. II. The recovery behavior in Stages I and II: experimental results. Report No. 2347