April 2016: Dr Sophie Primig, "Impact of the B2 ordering behaviour on the mechanical properties of a FeCoMo alloy"
FeCoMo alloys have recently been introduced as novel cutting materials for high-end gear hob milling in the automotive industry. Their main advantages are superior strength and wear resistance at elevated temperatures compared to conventional high-speed tool steels. In this work, a major industrial challenge, brittle failure during processing of FeCo Mo alloys, has successfully been tackled using advanced microscopy. The key experiments with 3D atom probe tomography and high-resolution transmission electron microscopy revealed ~5nm sized regions with a special regular arrangement of Fe and Co atoms in the crystal lattice, a brittle so-called B2 ordering phase. This allowed designing "disorder-annealing", a novel heat treatment that significantly improves the industrial processing of these cutting materials.
Read the full article, as published in Materials Science & Engineering A 662 (2016) 511-518.