Grain boundary diffusion and segregation of Bi in Cu: radiotracer measurements in B and C diffusion regimes
Grain boundary (GB) radiotracer diffusion of {sup 207}Bi in polycrystalline Cu was measured in Harrison's B (1198-843 K) and C (659-536 K) kinetic regimes. In the B regime the triple product P=s{center_dot}{delta}{center_dot}D{sub gb} (where s is the segregation factor and {delta} the GB width) was found to obey the Arrhenius law P=6.6x10{sup -12}xexp (-102.8 kJ mol{sup -1}/RT) m{sup 3} s{sup -1}. The measurements in the C regime yielded the temperature dependence of the Bi GB diffusion coefficient D{sub gb} in Cu, D{sub gb}=0.24xexp (-156.2 kJ mol{sup -1}/RT) m{sup 2} s{sup -1}. Assuming that {delta} congruent with 5x10{sup -10} m the segregation factor s of Bi in Cu was determined in the limit of very dilute solute concentration to follow an Arrhenius dependence s=s{sub 0}exp(-{delta}H{sub s}/RT) with the pre-exponential factor s{sub 0}=0.054 and the segregation enthalpy {delta}H{sub s}=-53.4 kJ mol{sup -1}.
- OSTI ID:
- 20634738
- Journal Information:
- Acta Materialia, Vol. 52, Issue 13; Other Information: DOI: 10.1016/j.actamat.2004.05.013; PII: S1359645404002757; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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