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Fe40Al intermetallic samples sintered by pressure-assisted induction sintering (PAIS) method


  Low density, high specific strength, high specific stiffness and enhanced resistance to wear, corrosion of FeAl alloys in comparison to steels and nickel-based alloys make them attractive for industrial usage [1, 2]. The mechanical properties of FeAl alloys highly depends on the aluminum content. For example, the yield strengths increase with the increase in aluminum content up to 40 at. % Al [2]. Casting is a traditional method of high-aluminum Fe-Al alloys manufacturing. However, during the sintering of Fe-Al alloys from elemental powders strong exothermic reactions (Self propagating High temperature Synthesis - SHS) take place [3]. This phenomenon is utilized during reactive casting named the Exo-melt™. Sikka et al. and Deevi et al. [4÷6] used the exothermic energy generated in SHS reaction to melt different intermetallics for casting. Another method of Fe-Al alloys fabrication is powder metallurgy (PM). Specimens obtain by the PM method possess desired geometry, satisfactory mechanical properties and density close to theoretical. In the present work, Fe40Al sinters were fabricated from elemental powders. The pressure-assisted induction sintering (PAIS) method was used to sinter the specimens. The PAIS apparatus was built at the Department of Advanced Materials and Technology of the Military University of Technology and designed for the production of massive sinters. APPARATUS Scheme and an overview of the apparatus for the PAIS is shown in Figures 1 and 2. The de[...]

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