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Abstract: The phase-field method was employed to simulate the effect of the geometric orientation and shape of second-phase particles to the matrix grain growth. Simulation results show that, in the grain growth process, most of the spherical particles were in the intersection of three crystals, stick particles were at the grain boundaries in the same direction with the grain boundary, and grain showed a strong grain boundary pinning effect 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(less than 5%) ;on the contrary, stick particles play better when the second-phase particles is large(larger than 5%).

[ Last edited by СÀ¼»¨ on 2009-10-27 at 17:51 ]

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the area fraction of the second-phase particles less than 5%
the area fraction of the second-phase particles larger than 5%
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Abstract: The phase-field method was employed to simulate the effect of the geometric orientation and shape of second-phase particles to the matrix grain growth. Simulation results show that, in the grain growth process, most of the spherical particles were in the intersection of three crystals, whereas stick particles at the grain boundaries were in the same direction with the grain boundary£©, moreover, grain (Õâ¸ögrainµ¥Êý»¹ÊǸ´Êý£¬µ¥ÊýÒª¼Óa£¬Èç¹ûÓÐÖ¸´ú¼Óthe£©showed a strong grain boundary pinning effect and the final average grain radius can be expressed by Zener relations.£¨Õâ¾äÎҹ⿴ӢÎľõµÃÓÐÎÊÌ⣬±í´ï²»ÊǺܺ㬵«ÎÒû¸Ä£© £¨Under the condition of Õâ¸öÊDz»ÊÇ¿ÉÒÔÓÃIn condition that´úÌæ£©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 are small(less than 5%) ;on the contrary, stick particles behave better when the second-phase particles are larger(larger than 5%).£¨Ç°ÃæÓÃÁËbetterºóÃæÒ²ÒªÓñȽϼ¶£¬·ñÔò²»Ò»Ö£©

[ Last edited by judecca on 2009-10-28 at 05:52 ]
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СÀ¼»¨(½ð±Ò+7,VIP+0):ллÄãµÄ°ïæ·­Ò룡ÎÒÔٺúÃ˼¿¼Ò»ÏÂÏÈ£¡ 10-30 08:52
zap65535(½ð±Ò+3,VIP+0):²¹·¢ 12-22 10:00
Abstract: The phase-field method was employed to simulate the effect of the geometric orientation and shape of second-phase particles to the matrix grain growth. Simulation results show that, in the grain growth process, most of the spherical particles are in the intersection of three crystals. Stick particles are at the grain boundaries in the same direction along the grain boundary.  The grain shows a strong pinning effect 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(less than 5%) . On the contrary, stick particles play an increasingly important role when the second-phase particles is large (larger than 5%).
4Â¥2009-10-28 05:53:13
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zap65535(½ð±Ò+3,VIP+0):²¹·¢ 12-22 10:00
The phase-field method was employed to simulate the effect of different geometric orientation club-shaped second-phase particles to the matrix grain growth. Simulation results showed that the second-phase particles precipitated along matrix grain boundaries and had same direction with the grian boundary.And at same time the second-phase particles were observed a strong pinning effect to grain boundary. The average grain radius can be expressed by Zener function relationship. In the case of the same second-phase particles area fraction and matrix particle size, no larger difference existed for clup-shaped particles and spherical particles in the pinning effect on matrix grain growth when the second-phase particles area fraction was small(less than 5%) . However club-shaped particles pinning influence to grain boundary could be better than the spherical particles when the area fraction was larger than 5%.
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5Â¥2009-10-28 23:42:46
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