Abstract
The solid solution of silver containing 0.42∼2.09 at%Ga was cold-worked and internally oxidized at temperatures between 500 and 650°C in still air for viarious times. The effects of oxidation temperature, time and solute content on the growth of the internally oxidized layer were investigated. The product of the solubility N0(s) and the diffusivity D0 of oxygen, and the activation energy for N0(s)D0 were calculated by Wagner’s equation.The results were summarized as follows.(1) The relation between the depth of the oxidation zone and the oxidation time can be expressed by a parabolic law. It was concluded that internal oxidation was governed by the diffusion of oxygen through the internally oxidized layer.(2) The activation energy for the product N0(s)D0 determined from the internal oxidation of the cold-worked Ag-0.42 at%Ga alloy below 550°C and above 600°C was 19.8±0.5 kcal/mol and 22.4±0.4 kcal/mol, respectively. The activation energy for internal oxidation of alloys except 0.42 at%Ga alloy was 23.3∼25.0 kcal/mol and slightly increased with increasing Ga content.(3) The product N0(s)D0 of oxygen in pure silver obtained by extrapolating Ga content to NGa(0)=0 was given by (13.5±0.4)×10−5exp[(−23400±600)⁄RT]. This value is in agreement with the product of the values of N0(s) and D0 determined individually by Eichenauer and Müller.
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