Interdiffusion in a bulk couple of lead and lead--50 wt % indium alloy
Interdiffusion between Pb and Pb-50 wt% In (64 at.% In) alloy in the temperature range from 115 to 173/sup 0/C has been studied using a bulk diffusion couple. Intimate bonding between the couple was achieved with the help of a soldering flux. Surfaces of the couple were finished by microtome and concentration profiles were determined by electron microprobe. The chemical interdiffusion coefficient, D, was obtained by applying the Boltzmann--Matano solution to the profiles and the interface velocities, r, were measured by Kirkendall's technique using 2 mil diameter Al wires as interface markers. Following the analysis of Darken and Manning on D and v. The intrinsic diffusion coefficients of both Pb and In in a Pb--In alloy of 41 at.% In were determined. It was found that In diffuses faster than Pb by at least a factor of 2. The activation energy for In diffusion in the alloy is 15 kcal/mole, which is considerably smaller than that of In in pure Pb, about 27 kcal/mole. Such a reduction in diffusion activation energy is anticipated in view of the much lower melting point of the alloy as compared with pure lead. Furthermore, the concentration dependence of D can also be adequately described by an empirical, melting point rule which utilizes the solidus temperature corresponding to a particular alloy composition.
- Research Organization:
- Watson Research Center, Yorktown Heights, NY
- OSTI ID:
- 7334701
- Journal Information:
- Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 24:7; ISSN AMETA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
ACTIVATION ENERGY
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
DIFFUSION
ELEMENTS
ENERGY
HIGH TEMPERATURE
INDIUM ALLOYS
LEAD
LEAD ALLOYS
MELTING POINTS
METALS
PHYSICAL PROPERTIES
SELF-DIFFUSION
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE