D. Gupta, D.R. Campbell
Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
It is shown that the difference in the free energy of activation for atoms diffusing in the lattice and in the grain-boundary is precisely the absolute grain-boundary energy. The self-diffusion data in Au in the lattice and along the grain-boundaries yielded excellent values of grain-boundary energies as a function of temperature. An addition of only 1·2 at. % Ta to Au was found to reduce the grain-boundary energies rather drastically. From the lowering of the grain-boundary energy, the solute excess at the grain-boundary was determined as a function of temperature which varied by over an order of magnitude in the 204°394°C range. An interaction energy of 5·6(±0·5) kcal/mole and entropy of 3·0 cal/mole K are determined for the Ta segregation on to the arbitrary high-angle grain-boundaries in Au. The grain-boundary energies and their solute interaction are discussed in the light of the available atomic models. © 1976 Taylor & Francis Group, LLC.
D. Gupta, D.R. Campbell
Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
K. Vieregge, D. Gupta
TMS Annual Meeting on Recent Advances in Tungsten and Tungsten Alloys 1991
D. Gupta
Canadian Metallurgical Quarterly
D. Gupta, K.K. Kim
Journal of Applied Physics