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Revealing the ductility of nanoceramic MgAl_2O_4

机译：揭示纳米母mgal_2O_4的延展性

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摘要

Ceramics are strong but brittle. According to the classical theories, ceramics are brittle mainly because dislocations are suppressed by cracks. Here, the authors report the combined elastic and plastic deformation measurements of nanoceramics, in which dislocation-mediated stiff and ductile behaviors were detected at room temperature. In the synchrotron-based deformation experiments, a marked slope change is observed in the stress-strain relationship of MgAl2O4 nanoceramics at high pressures, indicating that a deformation mechanism shift occurs in the compression and that the nanoceramics sample is elastically stiffer than its bulk counterpart. The bulk-sized MgAl2O4 shows no texturing at pressures up to 37 GPa, which is compatible with the brittle behaviors of ceramics. Surprisingly, substantial texturing is seen in nanoceramic MgAl2O4 at pressures above 4 GPa. The observed stiffening and texturing indicate that dislocation-mediated mechanisms, usually suppressed in bulk-sized ceramics at low temperature, become operative in nanoceramics. This makes nanoceramics stiff and ductile.
机译：陶瓷很强但脆弱。根据经典理论，陶瓷主要是因为裂缝被裂缝抑制的脱位。在这里，作者报告了纳米陶瓷的组合弹性和塑性变形测量，其中在室温下检测到脱位介导的静电和延展性。在基于同步rotron的变形实验中，在高压下的MgAl2O4纳米陶瓷的应力 - 应变关系中观察到标记的斜率变化，表明在压缩中发生变形机构偏移，并且纳米陶瓷样品具有比其体对应物更硬。散装的MgAl2O4显示出高达37GPa的压力下的纹理，其与陶瓷的脆性行为相容。令人惊讶的是，在4GPa以上的压力下，在纳米常规MgAl2O4中看到大量纹理。观察到的加强和纹理表明脱位介导的机制，通常在低温下在散装陶瓷中抑制，变得纳米陶瓷。这使纳米陶瓷僵硬和延展性。

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  • 来源
    《Journal of Materials Research》 |2019年第9期|1489-1498|共10页
  • 作者

    Chen Bin; Huang Yuanjie; Xu Jianing; Zhou Xiaoling; Chen Zhiqiang; Zhang Hengzhong; Zhang Jie; Qi Jianqi; Lu Tiecheng; Banfield Jillian F.; Yan Jinyuan; Raju Selva Vennila; Gleason Arianna E.; Clark Simon; MacDowell Alastair A.;

  • 作者单位

    Ctr High Pressure Sci & Technol Adv Res Shanghai 201203 Peoples R China;

    Ctr High Pressure Sci & Technol Adv Res Shanghai 201203 Peoples R China;

    Ctr High Pressure Sci & Technol Adv Res Shanghai 201203 Peoples R China;

    Ctr High Pressure Sci & Technol Adv Res Shanghai 201203 Peoples R China;

    Ctr High Pressure Sci & Technol Adv Res Shanghai 201203 Peoples R China;

    Ctr High Pressure Sci & Technol Adv Res Shanghai 201203 Peoples R China;

    Sichuan Univ Dept Phys Chengdu 610064 Sichuan Peoples R China;

    Sichuan Univ Dept Phys Chengdu 610064 Sichuan Peoples R China;

    Sichuan Univ Dept Phys Chengdu 610064 Sichuan Peoples R China;

    Univ Calif Berkeley Dept Earth & Planetary Sci Berkeley CA 94720 USA;

    Lawrence Berkeley Natl Lab Adv Light Source Berkeley CA 94720 USA;

    Lawrence Berkeley Natl Lab Adv Light Source Berkeley CA 94720 USA;

    Lawrence Berkeley Natl Lab Adv Light Source Berkeley CA 94720 USA|SLAC Natl Accelerator Lab Menlo Pk CA 94305 USA;

    Lawrence Berkeley Natl Lab Adv Light Source Berkeley CA 94720 USA;

    Lawrence Berkeley Natl Lab Adv Light Source Berkeley CA 94720 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ceramic; ductility; nanostructure;

    机译：陶瓷;延展性;纳米结构;

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