Abstract
Fe-xat%Cr (x=28, 38, 48, 58, 68) alloy powders were synthesized by a mechanical alloying (MA) of elementary Fe powder and Cr powder using a planetary ball mill for 360ks under 1.33kPa argon gas atomosphere. The obtained MA powders were consolidated at 1173K for 0.3ks with a spark plasma sintering (SPS) apparatus, and the rectangular sintered bodies having a size of 30 mm in length, 5 mm in width and 2 mm in thickness were prepared. The sintered bodies were cut into the tensile specimen by grinding. The tensile strength increased and the elongation decreased with increasing the Cr content. This is due to increase in a ratio of the hard Cr powders. Fe-68at%Cr alloy produced by a cast could not be grind because of the creation of chromium oxide, but that produced by a MA-SPS process could be grind and the tensile strength of this alloy was about 1500MPa. As this alloy was inferior to other alloys in a milling condition of Fe and Cr, the numerical value in tensile strength of this alloy was scattered. Considering balance of tensile strength and elongation, Fe-48at%Cr was the best composition in the Fe-Cr alloys, because the tensile strength was about 1125MPa and the elongation was more than 5%.
