Effect of Cr/Mo content on the properties of transition-metal based high entropy bulk metallic glasses

In this work, new Fe(20)Co(20)Ni(20)CrxMo(20-x)P(10)B(10) (x = 5, 10 and 15 at.%) high-entropy bulk metallic glasses (HE-BMGs) with the maximum diameter of 1.0-2.0 mm were prepared by combining fluxing treatment and J -quenching technique, and the effects of Cr/Mo content on thermal stability, mechanical properties, corrosion and wear resistances were systematically investigated. It is found that the glass transition temperature (T-g) and onset crystallization temperature (T-x) of the present transition-metal based HE-BMGs slightly decrease with the in-crease/decrease of Cr/Mo content. Compressive test shows that the compressive strength of the present transition-metal based HE-BMGs monotonously decrease from 3124 MPa for x = 5 to 2745 MPa for x = 15, but the compressive plasticity is nearly zero. Electrochemical measurements in 3.5 wt.% NaCl solution show that the corrosion resistance of the present transition-metal based HE-BMGs decrease with the increase/decrease of Cr/ Mo content and the alloy with x = 15 exhibit the highest corrosion resistance with a self-corrosion current density of 1.02 x 10(-8) A/cm(2) among the present transition-metal based HE-BMGs. Wear test shows that, as the Cr/Mo content increases/decrease, the friction coefficient and wear rate of the present transition-based HE-BMGs decrease, i.e., wear resistance increases.

Automated summary

In this study, new Fe(20)Co(20)Ni(20)CrxMo(20-x)P(10)B(10) high-entropy bulk metallic glasses were prepared and the effects of Cr/Mo content on thermal stability, mechanical properties, corrosion, and wear resistances were investigated. The results showed that Cr/Mo content affected the glass transition temperature, compressive strength, corrosion resistance, and wear resistance of the materials.