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Fabrication and densification of Heusler Fe2VAl alloy powders by mechanical alloying

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2013, 23(1), pp.51-57
  • DOI : 10.6111/JKCGCT.2013.23.1.051
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

김광덕 1 Lee Chung-Hyo 1

1목포대학교

Accredited

ABSTRACT

We have applied mechanical alloying (MA) to produce Heusler Fe2VAl thermoelectric alloy using a mixture of elemental Fe50V25Al25 powders. An optimal milling and heat treatment conditions to obtain the single phase of Fe2VAl compound with fine microstructure were investigated by X-ray diffraction and differential scanning calorimetry (DSC)measurement. The Fe50V25Al25 MA sample ball-milled for 60 hours exhibits a bcc α-(Fe,V,Al) solid solution. Single phase of Heusler Fe2VAl compound can be obtained by MA of Fe50V25Al25 mixture for 60 hours and subsequently heated up to 700oC. Sintering of the MA powders was performed in a spark plasma sintering (SPS) machine using graphite dies at 900~1000oC under 60 MPa. The Vickers hardness of bulk sample sintered at 1000oC was high value of Hv 870. All compact bodies have a high relative density above 90 % with metallic glare on the surface.

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