DIFFUSION OF NI-63 IN THE INTERMETALLIC B82-ALLOYS IN THE SYSTEMS NI/SN AND NI/IN

被引:10
作者
SCHMIDT, H
FROHBERG, G
WEVER, H
机构
[1] Institut für Metallforschung der Technischen Universität Berlin
来源
ACTA METALLURGICA ET MATERIALIA | 1992年 / 40卷 / 11期
关键词
D O I
10.1016/0956-7151(92)90473-R
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The self-diffusion of Ni-63 has been investigated in single crystals of the ordered intermetallic compounds Ni61Sn39, Ni62Sn38 and Ni64In36. The activation energies for diffusion perpendicular and parallel to the hexagonal c-axis are nearly the same and the values are between 2.14 and 2.34 eV. Moreover the D0-values are direction dependent and range from 0.5 to 0.8 cm2/s for Ni/Sn and from 65 to 110 cm2/s for Ni/In. The experimental values of D(perpendicular-to)/D(parallel-to) are between 1.13 and 1.68 for Ni/Sn and between 0.87 and 0.79 for Ni/In, depending on temperature. These values are to be compared with theoretical values for the different diffusion mechanisms. The majority mechanism should be a site change of the tracer atom between the Ni-chains in c-direction and the double tetraeder interstices (DTI) with a further jump to another chain. Moreover two other mechanisms as minority mechanisms are possible. With rising temperature and filling the DTI's the part of minority mechanisms increases.
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页码:3105 / 3111
页数:7
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