Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Spatial Distributions of Alloying Elements Obtained from Atom Probe Tomography of the Amorphous Ribbon Fe75C11Si2B8Cr4

  • Shin, Jinkyung (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Yi, Seonghoon (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Pradeep, Konda Gokuldoss (Dept. of Microstructure Physics and Alloy Design, Max-Planck Institute for Iron Research GmbH) ;
  • Choi, Pyuck-Pa (Dept. of Microstructure Physics and Alloy Design, Max-Planck Institute for Iron Research GmbH) ;
  • Raabe, Dierk (Dept. of Microstructure Physics and Alloy Design, Max-Planck Institute for Iron Research GmbH)
  • Received : 2012.12.17
  • Accepted : 2013.01.28
  • Published : 2013.03.27
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Abstract

Spatial distributions of alloying elements of an Fe-based amorphous ribbon with a nominal composition of $Fe_{75}C_{11}Si_2B_8Cr_4$ were analyzed through the atom probe tomography method. The amorphous ribbon was prepared through the melt spinning method. The macroscopic amorphous natures were confirmed using an X-ray diffractometer (XRD) and a differential scanning calorimeter (DSC). Atom Probe (Cameca LEAP 3000X HR) analyses were carried out in pulsed voltage mode at a specimen base temperature of about 60 K, a pulse to base voltage ratio of 15 %, and a pulse frequency of 200 kHz. The target detection rate was set to 5 ions per 1000 pulses. Based on a statistical analyses of the data obtained from the volume of $59{\times}59{\times}33nm^3$, homogeneous distributions of alloying elements in nano-scales were concluded. Even with high carbon and strong carbide forming element contents, nano-scale segregation zones of alloying elements were not detected within the Fe-based amorphous ribbon. However, the existence of small sub-nanometer scale clusters due to short range ordering cannot be completely excluded.

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