Property of Fe₅₂Cr₄₈ Alloy Prepared by Spark Plasma Sintering of Mechanical Alloyed Powder

Abstract

Fe₅₂Cr₄₈+5mass%X(X=Si, C) were synthesized by mechanical alloying (MA) of the elemental powders of Fe, Cr and Si/C using a planetary ball milling for 180ks under 1.33kPa argon gas atomosphere. These MA powders were consolidated by spark plasma sintering (SPS) process.
The X-ray diffraction patterns of mechanical alloyed Fe₅₂Cr₄₈+5mass%Si and Fe₅₂Cr₄₈+5mass%C powders were almost similar with that of mechanical alloyed Fe₅₂Cr₄₈ powder. The σ-phase was obtained by only SPS of Fe₅₂Cr₄₈+5mass%Si. In this MA-SPS process, Fe₅₂Cr₄₈ alloy without σ-phase was synthesized and formed because of the few Si contamination in this process. The sintered Fe₅₂Cr₄₈ alloy without σ-phase had a coefficient of thermal expansion lower than that of SUS304 stainless steel.