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| STUDY OF DYNAMIC RECRYSTALLIZATION OF A Cu-BASED ALLOY BFe10-1-1 WITH CONTINUOUS COLUMNAR GRAINS |
| YU Junwu, LIU Xuefeng, XIE Jianxin |
| Key Laboratory for Advanced Material Processing (Ministry of Education), University of Science and Technology Beijing, Beijing 100083 |
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Cite this article:
YU Junwu LIU Xuefeng XIE Jianxin. STUDY OF DYNAMIC RECRYSTALLIZATION OF A Cu-BASED ALLOY BFe10-1-1 WITH CONTINUOUS COLUMNAR GRAINS. Acta Metall Sin, 2011, 47(4): 482-488.
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Abstract Dynamic recrystallization behavior of a Cu-based alloy BFe10-1-1 with continuous columnar grains was investigated by hot compression test. Specimen was compressed in the temperature range of 750 to 900℃ and the strain rate range of 0.01 to 10 s-1. The results indicate that the dynamic recrystallization temperature of the tested alloy is about 850 ℃ and the thermal activated energy Q is 427.937 kJ/mol, higher than those of the alloy with equiaxial grains. When ln Z<43, dynamic recrystallization always happens in the alloys. When\linebreak ln Z>51, dynamic recrystallization can not occur. When 43≦ln Z≦51, dynamic recrystallization may happen at 850 or 900 ℃, may not happen at 750 or 800 ℃, which can serve as the critical regions of the alloy for dynamic recrystallization. Such effect is probably ascribe to the difference in the dynamic recrystallization mechanisms of the continuous columnar grained materials and ordinary polycrystalline materials. It is observed that the dynamically recrystallized area in the sample has expanded when the strain rate increases. Dynamic recrystallization preferentially nucleates at grain boundary in the form of grain-boundary bulging. Twins form in the recrystallized grains and are evolved into grain belt by “twinning dynamic recrystallization”.
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Received: 25 October 2010
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| Fund: Supported by National Basic Research Program of China (No.2011CB606300), National Natural Science Foundation of China (Nos. 50674008 and 50634010) and the Fundamental Research Funds for the Central Universities |
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