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The finite element method was employed to simulate the effect of the geometric orientation and shape of second-phase particles to the matrix grain growth. The simulation results show that, in the grain growth process, most of the spherical particles were in the intersection of three crystals boundary, while stick particles were at the grain boundaries in the same direction with the grain boundary. The second-phase particles showed a strong pinning effect on grain boundary and the final average grain radius can be expressed by Zener relations. Under the condition of the same area fraction and particle size, there is no difference between stick particles and spherical particles in the pinning effect on grain growth when the second-phase particles is small; on the contrary, the pinning effect of stick particles on grain boundary is better than that of the spherical particles when the area fraction of second-phase particles is large.

[ Last edited by СÀ¼»¨ on 2010-4-28 at 20:52 ]

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СÀ¼»¨(½ð±Ò+8, ·­ÒëEPI+1):·­ÒëµÄºÜ²»´í£¡Ð»Ð»ÄãµÄ°ï棡 2010-04-29 18:52
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The finite element method has been employed to simulate the effect of the stick-like second-phase particles with muliple geometric orientation on the matrix grain growth. The simulation results show that, in the grain growth process, most of the stick-like particles locate at the grain boundaries with the same direction to the grain boundary, thus displaying strong pinning effect to the grain growth of which can be expressed by Zener relations. Under the condition of the same area fraction and particle size, no obvious difference between stick particles and spherical particles has been observed in pinning the grain growth when the second-phase particles occupy a samll area fraction. However, comared to spherical particles, the stick-like particles show superior pinning effect when the area fraction of second-phase particles is large.
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