Microstructure and properties of melt-spun AlYNiCr multi-component amorphous alloy ribbons through partial substitution of Cr for Ni

摘要

In this study, the effect of partial substitution of Cr for Ni on microstructure, thermal and anti-corrosion properties of Al33.3Y33.4Ni33.3-xCrx (x = 1 similar to 10 at.) multi-component amorphous alloy ribbons was investigated. The onset crystallization temperature of metallic ribbons are all above 720 K. The average micro-hardness of each specimen is over 510 HV0.1. In spite of partial substitution of Cr for Ni, the self-corrosion potentials are almost unchanged and the maximum of pitting corrosion potential can reach -0.51 V-SCE for Al33.3Y33.4Ni27.3Cr6 alloy ribbons. When the Cr content increases from 1 at. to 10 at., it can result in a decrease of corrosion current density from 6.46 x 10(-5) A/cm(2) of the Al33.3Y33.4Ni32.3Cr1 to 3.63 x 10(-)(5) A/cm(2 )of the Al33.3Y33.4Ni31.3Cr2 and then increase to 4.67 x 10(-4) A/cm(2) of the Al33.31Y33.4Ni29.3Cr10 alloy ribbons. The minimum of passive current density can reach 1.05 x 10(-)(4) A/cm(2) for Al33.3Y33.4Ni29.3Cr4 alloy ribbons. Therefore, it is assumed that substituting appropriate content of Ni by Cr element into equimolar AlNiY medium entropy amorphous alloys can improve the ability to resist pitting corrosion in 3.5 wt NaCl solution.