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Abstract
A cost effective Co-free AlCrFe2Ni2 high entropy alloy was designed and prepared based on reported AlCoCrFeNi2.1 eutectic high entropy alloys. The as-cast AlCrFe2Ni2 alloy showed a tensile yield strength of 796MPa, an ultimate strength of 1437MPa, and an elongation of 15.7%, which was superior to most high entropy alloys and was even comparable with the Ti-based ultrafine-grain alloy. The alloy consisted of noodle-like FCC phases, disordered BCC (A2) phases, and ordered BCC (B2) phases. The excellent mechanical properties of the alloy were attributed to the spinodal decomposition of BCC phases and the composite effect of the softer FCC and harder BCC phases.
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