Get access

Direct Observation of a Screw Dislocation Normal to the Beam by Z-Contrast STEM

Authors

  • Fangzhi Li,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
    Search for more papers by this author
  • Hongqiang Nian,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
    Search for more papers by this author
  • Kui Du,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
    Search for more papers by this author
  • Jiemin Wang,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
    Search for more papers by this author
  • Jingyang Wang,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
    Search for more papers by this author
  • Yanchun Zhou

    Corresponding author
    1. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing, China
    • Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
    Search for more papers by this author
    • Member, The American Ceramic Society.

  • This work was financially supported by the National Outstanding Young Scientist Foundation for Y. C. Zhou under Grant No. 59925208 and Natural Sciences Foundation of China under Grant No. 90403027, 50302011, and 50832008.

Author to whom correspondence should be addressed. e-mail: yczhou714@gmail.com.

Abstract

Dislocation core structures in metals and ceramics are long-standing questions in materials research. Detailed knowledge about core structure of screw dislocations remains a major challenge. We have designed and synthesized a novel HfAl4C4 ceramic with a large c axis and vast difference in atomic numbers, in which a c[0001] screw dislocation is directly observed with dislocation line perpendicular to the viewing direction by STEM. This observation has cast a new light on revealing the detailed core structure of screw dislocations.

Get access to the full text of this article

Ancillary