...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Microstructure and properties of a CoCrFeNiMn high-entropy alloy processed by equal-channel angular pressing
【24h】

Microstructure and properties of a CoCrFeNiMn high-entropy alloy processed by equal-channel angular pressing

机译：等通道转角压制CoCrFeNiMn高熵合金的组织与性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A CoCrFeNiMn high-entropy alloy (HEA) was processed by equal-channel angular pressing (ECAP) for up to four passes at 673 K and the results show that the strength increases gradually with increasing straining up to - 1 GPa with an elongation to failure of ~ 35% after four passes of ECAP. In this condition, the microstructure is a single-phase ultrafine-grained (UFG) CoCrFeNiMn HEA with an average grain size of ~ 100 nm and a high dislocation density. This UFG HEA was subjected to post-deformation annealing (PDA) at temperatures of 673-1073 K for 60 min and it is shown that the hardness increases slightly due to precipitation to 773 K and then decreases to 1073 K due to a combination of recrystallization, grain growth and a dissolution of precipitates. The formation of brittle σ-phase precipitates improves the strength significantly but with a minor decrease in ductility. Annealing at the peak temperature of 773 K produces a very high yield strength of ~ 1015 MPa and an ultimate strength of - 1080 MPa together with an excellent elongation to failure of ~ 30%. An analysis of the data shows that grain boundary strengthening is the most important strengthening mechanism in these ECAP samples both before and after PDA.
机译：通过等通道角压（ECAP）在673 K下对CoCrFeNiMn高熵合金（HEA）进行了多达四道次的处理，结果表明，强度随着应变的增加而逐渐增加，直至-1 GPa并具有断裂伸长率在ECAP四次通过后，约占35％。在这种条件下，显微组织是单相超细晶粒（UFG）CoCrFeNiMn HEA，平均晶粒尺寸约为100 nm，位错密度高。该UFG HEA在673-1073 K的温度下经历了变形后退火（PDA）60分钟，结果表明，由于沉淀至773 K，硬度略有增加，然后由于重结晶的组合而降低至1073 K ，晶粒长大和沉淀物溶解。脆性σ相析出物的形成显着提高了强度，但延展性略有下降。在773 K的峰值温度下进行退火可产生约1015 MPa的极高屈服强度和-1080 MPa的极限强度，并具有约30％的出色断裂伸长率。数据分析表明，在PDA前后，这些ECAP样品中晶界强化是最重要的强化机制。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第29期|411-419|共9页
  • 作者

    Hamed Shahmir; Tayebeh Mousavi; Junyang He; Zhaoping Lu; Megumi Kawasaki; Terence G. Langdon;

  • 作者单位

    Materials Research Croup, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;

    Department of Materials, University of Oxford, Parks Road, Oxford 0X1 3PH, UK;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 10083, People's Republic of China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 10083, People's Republic of China;

    Division of Materials Science and Engineering and the Research Institute of Industrial Science, Hanyang University, Seoul 133-791, South Korea;

    Materials Research Croup, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CoCrFeNiMn; High-entropy alloy; Equal-channel angular pressing; Post-deformation annealing; Severe plastic deformation;

    机译：CoCrFeNiMn;高熵合金;等通道角压;变形后退火;严重的塑性变形;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号