Authors: Chunxiang Cui; Yanchun Li; Yutian Shen; Jibing Sun; Ru Wang

Source: Journal of Nanoscience and Nanotechnology, Volume 3, Number 5, October 2003 , pp. 410-412(3)

Publisher: American Scientific Publishers

Abstract:

This paper deals with the interaction mechanism between in situ nanometer-grade TiN-AlN particles and the solid/liquid (S/L) interface during the solidification of an in situ TiN-AlN/Al composite. According to the setting of a force balance for the particles in front of the S/L interface during solidification, F = F_buoyant + F_repulsive + F_viscous. We obtained the relationship between the critical cooling velocity of the liquid composite, V_r, and the size of the ceramic particle, r_p. By this relationship formula, we can know that the S/L interface engulfs particles or pushes them to the crystal grain boundary during the solidification of a TiN-AlN/Al composite. It is found that V_r is proportional to the radius of ceramic particles by transmission electron microscope (TEM) observation. The TEM test indicates that the smaller the particle is, the more easily the S/L interface engulfs particles.

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2003.171

Publication date: 2003-10-01

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