Spark plasma sintering (SPS) is a powder metallurgy technique that employs the use of fast sintering kinetics to produce final consolidated components in a matter of minutes. In order to use blended powders in SPS to obtain fully alloyed parts, diffusion during sintering must be understood. An investigation into the effects of current on the diffusion of copper and nickel was performed using SPS. Bulk specimens were used to generate diffusion couples in SPS in alternating orientations with respect to the direction of the current. Control samples were produced using a horizontal insertion vacuum furnace. Experiments were performed at temperatures between 850 °C and 1000 °C for 3 h. Concentration profiles were obtained by the use of both energy-dispersive spectroscopy and a Monte Carlo simulated correction curve. Diffusion coefficients and activation energies were calculated for samples produced by SPS and annealing without current. It was shown that, at temperatures near 0.9 Tm, the application of current in SPS inhibits diffusion between copper and nickel due to the re-orientation of electrons caused by the loss of ferromagnetism in nickel. Activation energy for diffusion is, however, decreased due to the temperature gradients arising from the difference in resistivity between the two species.
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21 October 2014
Research Article|
October 17 2014
The effects of applied current on one-dimensional interdiffusion between copper and nickel in spark plasma sintering Available to Purchase
S. Rudinsky;
S. Rudinsky
Department of Mining and Materials Engineering,
McGill University
, 3610 University Street, Montreal, Quebec H3A 0C5, Canada
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R. Gauvin;
R. Gauvin
Department of Mining and Materials Engineering,
McGill University
, 3610 University Street, Montreal, Quebec H3A 0C5, Canada
Search for other works by this author on:
S. Rudinsky
Department of Mining and Materials Engineering,
McGill University
, 3610 University Street, Montreal, Quebec H3A 0C5, Canada
R. Gauvin
Department of Mining and Materials Engineering,
McGill University
, 3610 University Street, Montreal, Quebec H3A 0C5, Canada
M. Brochu
a)
Department of Mining and Materials Engineering,
McGill University
, 3610 University Street, Montreal, Quebec H3A 0C5, Canada
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Appl. Phys. 116, 154901 (2014)
Article history
Received:
August 21 2014
Accepted:
October 03 2014
Citation
S. Rudinsky, R. Gauvin, M. Brochu; The effects of applied current on one-dimensional interdiffusion between copper and nickel in spark plasma sintering. J. Appl. Phys. 21 October 2014; 116 (15): 154901. https://doi.org/10.1063/1.4898158
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