UBC Theses and Dissertations
Quenched in defects in silver and silver alloys Ssu, Yun I
An investigation has been made of the formation energy, and the activation energy of migration of vacancies in pure silver and its alloys with Cu, Au and Pd. In pure silver the quenched in resistivity rises with increasing quench temperature. In the alloys, however, the quenched in resistivity decreases at first, passes through a minimum and only begins to rise at fairly high quench temperatures. The decrease in the quenched in resistivity in these alloys may be attributed to the destruction of short range order existing in the well annealed specimens. This mechanism is similar to that invoked by both Damask and Korevaar in similar experiments. The annealing characteristics of these quenched specimens also confirm this view. A method, other than that used by Korevaar, for evaluating the formation energy, of a vacancy was used. The results so obtained yield values for Ef of 0.8 ev and Em ranging from .70 ev to 1.02 ev. These results seem reasonable, although it is felt they are insufficiently accurate and extensive to warrant detailed conclusions concerning the effects of specific alloying element s.
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