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Magnetic Properties of E21-base Co3AlC and the Correlation with the Ordering of Carbon Atoms and Vacancies

Published online by Cambridge University Press:  26 February 2011

Yoshisato Kimura ,
Fu-Gao Wei ,
Hideyuki Ohtsuka  and
Yoshinao Mishima
Yoshisato Kimura
Affiliation:
Materials Science and Engineering, Tokyo Institute of Technology, 4259-G3–23 Nagatsuta, Midori-ku, Yokohama 226–8502, Japan.
Fu-Gao Wei
Affiliation:
National Institute for Materials Science, 1–2–1 Sengen, Tsukuba, Ibaraki 305–0047, Japan.
Hideyuki Ohtsuka
Affiliation:
National Institute for Materials Science, 1–2–1 Sengen, Tsukuba, Ibaraki 305–0047, Japan.
Yoshinao Mishima
Affiliation:
Materials Science and Engineering, Tokyo Institute of Technology, 4259-G3–23 Nagatsuta, Midori-ku, Yokohama 226–8502, Japan.
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Abstract

Targeting to develop E21 Co3AlC based heat resistant alloys, phase stability of E21 Co3AlC and (Co, Ni)3AlC has been investigated together with the magnetic properties of E21’ Co3AlC0.5 which is formed by the extra ordering of carbon atoms accompanying anti-phase boundary (APB). The correlation of ferromagnetism with APB in E21’ Co3AlC0.5 was evaluated using single crystals by high-resolution transmission electron microscopy (HRTEM) and vibrating sample magnetometer. Anti-phase domain (APD) size affects the ferromagnetism: for instance, the saturation magnetization becomes larger as the APD size is smaller. Local atomic configuration at APB was clearly observed by HRTEM image.

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References

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