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Yinong WANG J.C.Huang Department of Materials Engineering Dalian University of Technology Dalian China Institute of Materials Science Engineering National Sun Yat-San University Kaohsiung Taiwan ChinaAssoc. Prof. Ph.D. 《材料科学技术学报》2005,21(1):71-74
A two-stage strain rate deformation method is proposed to enhance the superplasticity in a hot extruded AZ61 alloy. In the stage-one of deformation, a relatively high strain rate was applied in order to obtain fine grains through dynamic recrystallization. The optimum strain rate for DRX at 300℃ was identified as -5×10-3s-1. Stage-two is conducted at relatively low strain rate in order to utilize the fine grains refined by DRX during stage-one to make the grain boundary sliding operate more smoothly, which resulting in enhanced superplastic elongation from 350% to 440%. 相似文献