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杨西荣.ECAP+旋锻变形制备超细晶纯锆的低周疲劳行为研究[J].稀有金属材料与工程(英文),2019,48(4):1202~1207.[yangxirong.Low Cycle Fatigue Behavior of Ultrafine grained CP-Zr Processed by ECAP and RS[J].Rare Metal Materials and Engineering,2019,48(4):1202~1207.]
Low Cycle Fatigue Behavior of Ultrafine grained CP-Zr Processed by ECAP and RS
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Received:August 31, 2017  Revised:December 05, 2017
Key words: Ultra-fine pure zirconium  Low cycle fatigue  Cyclic softening and hardening  Fatigue life
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目);陕西省教育厅科技专项
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      Ultrafine grained (UFG) commercially pure Zr was prepared by Equal Channel Angular Pressing (ECAP) and Rotary swaging (RS). The Low cycle fatigue properties of the UFG pure Zr were investigated by a method under axial loading controlled by symmetric strain. The characteristics of cyclic stress and strain response and hysteresis loop of UFG pure Zr were discussed. Softing and hardening characteristics and cumulative hysteresis of the UFG pure Zr were analyzed and then the fatigue life was predicted. The results indicate that the cyclic softening and hardening properties of UFG pure Zr depend on the size of the applied total strain amplitude, and the softening ratio is most significant when the total strain amplitude is more than 1.0%. The hysteresis loop area increases with the total strain amplitude increasing, and the “ratchet phenomenon” occurs when the strain amplitude is small. Regression analysis shows that the fatigue life of UFG pure Zr matches Coffin-Manson"s empirical