多组元AlxTiVCrMnFeCoNiCu高熵合金的室温力学性能

依据多组元高混合熵合金的合金设计理念,设计了一族九组元AlxTiVCrMnFeCoNiCu高熵合金,并研究了该合金系室温力学性能.结果表明:(1)合金系具有超过1.3GPa的断裂强度,其中AlTiVCrMnFeCoNiCu合金达2.4GPa,同时AlTiVCrMnFeCoNiCu和Al2TiVCrMnFeCoNiCu两种合金还具有一定的压缩塑性;(2)合金系枝晶和枝晶间隙区均具有很高的显微硬度,且随Al含量的提高而近线性提高;(3)固溶强化机制、纳米相弥散强化机制和面心立方/体心立方相转变使得合金系具有很高的断裂强度和显微硬度.

Room temperature mechanical properties of the AlxTiVCrMnFeCoNiCu high entropy alloy system with multi-principal elements

The AlxTiVCrMnFeCoNiCu high-entropy alloys,designed by using the strategy of high entropy of mixing,were investigated on room-temperature mechanical properties.The four alloys have the compressive strength higher than 1.3 GPa and the compressive strength of AlTiVCrMnFeCoNiCu alloy reaches 2.4 GPa.Besides,both AlTiVCrMnFeCoNiCu and Al2TiVCrMnFeCoNiCu alloys exhibit compressive plasticity.For the alloy system,the microhardness in both dendrite and interdendrite area increase with increasing Al content.Such excellent room-temperature mechanical properties should be attributed to the solution strengthening,the dispersion strengthening of nano-scale particles,and the structure transformation from ductile face-centered cubic phases to strong body-centered cubic phases.