Grain boundary diffusion and segregation of Ni in Cu |
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Affiliation: | Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Strasse 10, D-48149 Münster, Germany |
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Abstract: | Grain boundary (GB) diffusion of 63Ni in polycrystalline Cu was investigated by the radiotracer technique in an extended temperature interval from 476 to 1156 K. The independent measurements in Harrison’s C and B kinetic regimes resulted in direct data of the GB diffusivity Dgb and of the so-called triple product P = s · δ · Dgb (s and δ are the segregation factor and the diffusional GB width, respectively). Arrhenius-type temperature dependencies for both the Dgb and P values were measured, resulting in the pre-exponential factors m2 s−1 and P0 = 1.89 × 10−16 m3 s−1 and the activation enthalpies of 90.4 and 73.8 kJ mol−1, respectively. Although Ni is completely soluble in Cu, it reveals a distinct but still moderate ability to segregate copper GBs with a segregation enthalpy of about −17 kJ mol−1. |
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