Scholarlink

<p>Ceramic materials are usually hard but brittle, and it is challenging to achieve a simultaneous enhancement of strength and plasticity using conventional strengthening methods. In ceramic materials with similar atomic size and properties, the fabrication of nanotwins is a promising approach to enhance the plasticity, but it is unknown whether the strategy works for transition metal nitrides. Herein, nanotwinned CrN (NT-CrN) with a twin density of 9.0 × 10<sup>15 </sup>m<sup>-2</sup> and twin-containing grain volume fraction of about 52 % is prepared by adjusting the ion kinetic energy during growth. Owing to the twin boundaries, NT-CrN exhibits high hardness (&gt;36 GPa) and enhanced room-temperature plasticity at the same time. Compression deformation of over 40% without brittle failure is achieved. The enhanced room-temperature plasticity is attributed to the distributions of nanotwin boundaries (nano-TB) which allow special slipping by twisting the polyhedron constructed by nano-TB without bond breakage. The accompanying twin proliferation and fusion subsequently dissipate the energy to enhance the plasticity.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Nanotwinned CrN ceramics with enhanced plasticity

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月1日

查看全文
  • Liangliang Liu,
  • Xiaokai An,
  • Xinlei Gu,
  • Tijun Li,
  • Dongjie Yang,
  • Bingjing Huang,
  • Qiang Xu,
  • Ziqi Ma,
  • Shusheng Chen,
  • Kan Zhang,
  • Suihan Cui,
  • Paul K. Chu,
  • Zhongzhen Wu

摘要

Ceramic materials are usually hard but brittle, and it is challenging to achieve a simultaneous enhancement of strength and plasticity using conventional strengthening methods. In ceramic materials with similar atomic size and properties, the fabrication of nanotwins is a promising approach to enhance the plasticity, but it is unknown whether the strategy works for transition metal nitrides. Herein, nanotwinned CrN (NT-CrN) with a twin density of 9.0 × 1015 m-2 and twin-containing grain volume fraction of about 52 % is prepared by adjusting the ion kinetic energy during growth. Owing to the twin boundaries, NT-CrN exhibits high hardness (>36 GPa) and enhanced room-temperature plasticity at the same time. Compression deformation of over 40% without brittle failure is achieved. The enhanced room-temperature plasticity is attributed to the distributions of nanotwin boundaries (nano-TB) which allow special slipping by twisting the polyhedron constructed by nano-TB without bond breakage. The accompanying twin proliferation and fusion subsequently dissipate the energy to enhance the plasticity.