Age hardening reaction of the Al0.3CrFe1.5MnNi0.5 high entropy alloy

作者：Tsao L C^*; Chen C S; Chu C P

来源：Materials & Design, 2012, 36: 854-858.

DOI：10.1016/j.matdes.2011.04.067

• High entropy alloy
• Microstructure
• Microhardness

In this study, an Al0.3CrFe1.5MnNi0.5 high entropy alloy (HEA) was synthesized using a well-developed arc-melting and casting method. The as-cast alloy ingot was heat treated for 8 h at 650-750 degrees C and then quenched in water to investigate the effects of age treatment on the microstructure and microhardness of the alloy. The microstructure of the as-cast Al0.3CrFe1.5MnNi0.5 alloy consisted of the interdendritic rich-Ni FCC phase, rich-Cr BCC phase dendrite matrix, and a small fraction of cross-like rich-Ni FCC phase (beta-FCC) within the majority dendritic structure. After aging at 650 degrees C, a cross-like FCC phase (beta-FCC) with dendritic matrix disappeared, and both AlNi phase and Cr5Fe6Mn8 phase precipitated within the matrix dendrites. The interdendritic beta(1) FCC phases decomposed into matrix structures and transformed into the second-phase (beta(2) FCC) during aging at 750 degrees C. In addition, the precipitation of AlNi phase in the matrix dendrites became larger and globular shape inside the grain matrix. These precipitation phases in the grain matrix are the main age hardening mechanism.

• 出版日期2012-4