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杨西荣,朱振,刘晓燕,罗雷,赵西成.超细晶工业纯锆的室温蠕变特性及断口分析[J].稀有金属材料与工程(英文),2019,47(3):815~819.[YANG XIRONG,ZHU ZHEN,LIU XIAOYAN,LUO LEI and ZHAO XICHENG.Creep Behavior and Fracture of Ultra-Fine Grained Commercial Purity Zirconium at Ambient Temperature[J].Rare Metal Materials and Engineering,2019,47(3):815~819.]
Creep Behavior and Fracture of Ultra-Fine Grained Commercial Purity Zirconium at Ambient Temperature
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Received:July 20, 2017  Revised:September 26, 2017
DOI:
Key words: UFG CP Zirconium, creep, steady state creep rate, creep fracture
Foundation item:国家自然科学基金(51474170)、陕西省自然科学基金(2016JQ5026)和陕西省教育厅重点实验室科研计划项目(15JS058)联合资助
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YANG XIRONG,ZHU ZHEN,LIU XIAOYAN,LUO LEI and ZHAO XICHENG  
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Abstract:
      The creep tests were carried out on Ultra-fine grained commercial purity zirconium under the stresses of 0.875 Rp0.2、0.9 Rp0.2、0.9125 Rp0.2、0.925 Rp0.2、0.9375 Rp0.2、0.95 Rp0.2 at ambient temperature. Steady state creep rate was calculated. The creep fracture of UFG CP Zr was investigated by SEM. A new expression was proposed which fit the creep of UFG CP Zr better. It was found that the creep saturation phenomenon happened under 0.875 Rp0.2; the steady state creep rate increased with the rise of creep stress which led the steady state creep stage shortening; the maximum of steady state creep rate was 3.140×10-6s-1 under 0.95 Rp0.2. According to the calculated creep stress exponent, the creep mechanism can be categorized into the dislocation motion. The creep fracture of UFG CP Zrwas ductile fracture.