| Description |
vii, 71 leaves : illustrations ; 28 cm. |
| Summary |
"Precise measurements of lattice parameters and densities of the alpha-phase Cu-In solid solutions were made at temperatures of 25°C. The thermal expansion coefficients between 15 and 65°C, the solid solubility of In in Cu at 650°C, and the soundness of crystal structure resulting from alloying were determined. The Cu-In alloys were prepared from high purity (99.999%) Cu and In by melting both metals inside evacuated quartz tubes. The solidified alloys were annealed and then examined by X-ray for homogeneity...The slowly solidified alpha-phase alloys gave densities lower than the theoretical (X-ray) values due to the presence of shrinkage microporosity. This density defect was found to increase with In concentration. The alloys quenched from the molten state, while still exhibiting lower density values, showed no visible porosity. However, upon annealing, voids appeared. It is very possible that the frozen-in vacancies in the quenched alloys coalesced during the prolonged heat treatment to voids visible under the optical microscope. The pores could be annihilated by plastic deformation (compression or rolling) and then the densities raised up to the theoretical. It is concluded that no structural defects (monovacancies) are formed during the cooling of Cu-In alloys, only microporosity probably due to differential shrinkage of the primary crystallization products as compared with the matrix"--Abstract, leaves ii-iii. |
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