STUDY OF DYNAMIC RECRYSTALLIZATION OF A Cu-BASED ALLOY BFe10-1-1 WITH CONTINUOUS COLUMNAR GRAINS

Dynamic recrystallization behavior of a Cu-based alloy BFe10-1-1 with con- tinuous 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 .T he re- sults 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 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 differ- ence 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