Journal of Magnetics

  • 제16권4호
  • /
  • Pages.440-443
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  • 2011
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  • 1226-1750(pISSN)
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  • 2233-6656(eISSN)
한국자기학회 (The Korean Magnetics Society)
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Large Glass-forming Ability and Magnetocaloric Effect in Gd55Co20Al23Si2 Bulk Metallic Glass

  • Li, Qian (Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences) ;
  • Cai, Pingping (Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences) ;
  • Shen, Baolong (Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences) ;
  • Akihiro, Makino (Institute for Materials Research, Tohoku University) ;
  • Akihisa, Inoue (Institute for Materials Research, Tohoku University)
  • 투고 : 2011.08.21
  • 심사 : 2011.10.14
  • 발행 : 2011.12.31
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초록

In this study, we investigated the glass-forming ability (GFA) and magnetocaloric effect (MCE) of $Gd_{55}Co_{20}Al_{23}Si_2$ bulk glassy alloy. It is found that the addition of 2 at% Si is effective for extension of the supercooled liquid region (${\Delta}T_x$), the ${\Delta}T_x$ is 55 K for the $Gd_{55}Co_{20}Al_{25}$ glassy alloy, and increases to 79 K for the $Gd_{55}Co_{20}Al_{23}Si_2$ alloy. As a result, $Gd_{55}Co_{20}Al_{23}Si_2$ glassy alloys with diameters up to 5 mm were successfully synthesized. The alloys also exhibit large MCE, i.e., the magnetic entropy change (${\Delta}S_m$) of 8.9 J $kg^{-1}\;K^{-1}$, the full width at half maximum of the ${\Delta}S_m$ (${\delta}T_{FWHM}$) of 87 K, and the refrigerant capacity (RC) of 774 J $kg^{-1}$.

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