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Elimination of an isolated pore: Effect of grain size Wan Y. Shih
 

Summary: Elimination of an isolated pore: Effect of grain size
Wan Y. Shih
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544-5263
Wei-Heng Shih
Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104
Ilhan A. Aksay
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544-5263
(Received 28 October 1993; accepted 15 December 1994)
The effect of grain size on the elimination of an isolated pore was investigated both
by the Monte Carlo simulations and by a scaling analysis. The Monte Carlo statistical
mechanics model for sintering was constructed by mapping microstructures onto domains
of vectors of different orientations as grains and domains of vacancies as pores. The
most distinctive feature of the simulations is that we allow the vacancies to move. By
incorporating the outer surfaces of the sample in the simulations, sintering takes place
via vacancy diffusion from the pores to the outer sample surfaces. The simulations were
performed in two dimensions. The results showed that the model is capable of displaying
various sintering phenomena such as evaporation and condensation, rounding of a sharp
corner, pore coalescence, thermal etching, neck formation, grain growth, and growth of

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science