The effects of applied current on one-dimensional interdiffusion between copper and nickel in spark plasma sintering

作者：Rudinsky S; Gauvin R; Brochu M^*

来源：Journal of Applied Physics, 2014, 116(15): 154901.

DOI：10.1063/1.4898158

Spark plasma sintering (SPS) is a powder metallurgy technique that employs the use of fast sinteringkinetics 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 degrees C and 1000 degrees C for 3h. 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 0.9T(m) 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.

• 出版日期2014-10-21
• 单位McGill