Effects of annealing treatment on properties of CoCrFeNiTiAlx multi-component alloys

CoCrFeNiTiAlx (x: molar ratio) multi-component alloys were prepared by vacuum arc-melt casting and the as-cast alloys were subsequently heat treated at 1000 degrees C for 2 h. Effects of Al content and annealing treatment on the mechanical, electrical and magnetic properties were investigated. The addition of Al exhibits significant influence on mechanical properties of the as-cast and the as-annealed alloys, which is actually induced by the evolution of phase composition. The prepared alloys demonstrate good resistance against anneal-softening, as most of the as-annealed alloys show even higher hardness than the as-cast ones. As-annealed Al-0 possesses excellent mechanical property with high compressive strength of 2.46 GPa and strain rate of 12.7%. Strengthening mechanism is revalued in this study as phase composition is considered as a critical factor. The as-cast and the as-annealed CoCrFeNiTiAlx alloys exhibit high electrical resistivity and novel magnetic properties as well. (C) 2012 Elsevier Ltd. All rights reserved.