Abstract
By applying the vacuum-deposition method, it may be possible to prepare alloys constituted of elements mutually insoluble in the liquid state. From this point of view, Ag-Ni and Ag-C alloys were successfully produced, and their structure and the mechanical properties were investigated. The following results were obtained: (1) The solid solution of silver containing up to 9 at%Ni could be produced. The solid solubility of carbon in silver could not be detected by means of the X-ray method, but the change in the electric resistivity of 1 and 2 at%C-Ag alloys with temperature indicated the decomposition of the solid solution into silver and carbon. (2) By alloying nickel and carbon in silver, the duplex grain structure in silver films as-deposited were normalized and refined. (3) After the tempering of 4 at%Ni-Ag alloy at 400°C and of 1 and 2 at%C-Ag alloys at 200°C, they were hardened by the precipitation of fine nickel and carbon particles. (4) The linear relationship between proof stress vs. (grain diameter)−1⁄2 for bulk silver polycrystals can be applied to vacuum-deposited films up to about 0.1 μ in grain diameter, but the proof stress of ultra-fine grained silver with grain diameters of less than 0.1 μ was smaller than the value expected from the Petch’s relation.
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