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Koehler, James S. Sharma, Ram Kishore 2011-07-11T14:02:58Z 2011-07-11T14:02:58Z 10000-01-01 1968 Gold specimens of six nines purity were strained at 4.Z K by tensile deformation and were quenched from 700 ± 40 oC. For gold deformed at 4.ZoK the most prominent annealing is observed in the region between ZOoC and 70°C. For this case the annealing at 40°C obeys second order kinetics and the effective energy of migration, which increases with increasing purity, is 0.90 ± .04 eV for specimen of highest purity. For fast quenched gold (dT/dt = 5 x 10^4 to 5 0 .00 1.1 x 10 C/sec) the stage III annea1ing occurs from 40 C to 100 C. The annealing obeys second order kinetics and the effective energy of migration increases from 0.80 eV to 0.90 eV as the residual resistivity at 4.Z o K decreases from 9.5 x 10 -100 cm to 4.Z x 10 -10 0 cm. For slow dT 3 4 0 . quenched gold (dt = 7 x 10 to Z x 10 C/sec) the annea1~ng follows first order kinetics and the activation energy of migration is 0.70 ± .04 eV. The stage III annealing in deformed and fast quenched gold is attributed to the migration of a single vacancy in the presence of a high density of sinks. The results are shown to be consistent with an annealing theory which assumes that the divacancy has a high binding energy and that the value of sink density is important in determining the rate limiting process for the annealing. Fr~m the annealing kinetics of fast quenched gold and by using high temperature diffusion and thermal equilibrium data, the binding energy of a divacancy is calculated to be 0.35 < B < 0.52 eV. Some tensile deformation experiments were done on 99.9999% pure silver. The annealing is found to be much more complicated as compared with gold and stage III activation energy is 0.70 ± .04 eV. The identity of defects taking part in stage III in silver is not clear at the present time. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T14:02:58Z No. of bitstreams: 1 1968_sharma.pdf: 3995580 bytes, checksum: 6ea91da3766ea516f3783bb8d08cc8b8 (MD5) Made available in DSpace on 2011-07-11T14:02:58Z (GMT). No. of bitstreams: 1 1968_sharma.pdf: 3995580 bytes, checksum: 6ea91da3766ea516f3783bb8d08cc8b8 (MD5) Previous issue date: 1968 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T14:02:58Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:32:39-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6076351 http://hdl.handle.net/2142/25743 en 1968 Ram Kishore Sharma point defect production point defect annealing quenching tensile deformation gold silver The production and annealing of point defects produced by quenching and by tensile deformation in pure gold and silver Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.