Ni-Cu合金中のNi⁶³およびCu⁶⁴の拡散

抄録

The self-diffusion coefficients of nickel and copper in nickel-copper alloys containing 0 to 100%Cu have been measured with a usual lathe sectioning technique. Polycrystalline specimens having 1 to 4 mm grain size were used. Measurements were carried out at the high temperature range near the melting point of each alloy. In this alloy system, copper atom diffuses more rapidly than nickel atom, and for each composition the ratio of diffusion coefficient of copper to that of nickel is from 2.5 to 6 over the temperature range examined. Diffusion rates of both elements increase with increasing copper contents. The frequency factors for nickel self-diffusion are determined to be 1.9, 35, 17, 0.063 and 1.7 cm²/sec, and the activation energies are 68.0, 74.9, 66.8, 49.7 and 55.3 kcal/mol in alloys containing 0,13.0, 45.4, 78.5 and 100 at% copper, respectively. For copper self-diffusion in respective alloys, the frequency factors are 0.57, 1.5, 2.3, 1.9 and 0.33 cm²/sec, and the activation energies are 61.7, 63.0, 60.3, 55.3 and 48.2 kcal/mol.