Structure and properties of AlCrFeNiCuTi six principal elements equimolar alloy

An AlCrFeNiCuTi six principal elements equimolar alloy was prepared by powder metallurgy. The microstructure, hardness, corrosion resistance and compression strength of the alloy were investigated by means of scanning electron microscopy with spectroscopy (SEM/EDS), X-ray diffraction, micro/Vickers hardness tester, electrochemical workstation and material testing machine. Experimental results show that the AlCrFeNiCuTi alloy was mainly composed of petal-like microstructure, in which petal edge and center are filled with fine and coarse particles respectively. Copper is enriched in intergranular regions, which improves the plasticity of the alloy. The microhardness is 522 HV and the compressive strength is 1474 MPa. Compared with 304 stainless steel, the corrosion current density of AlCrFeNiCuTi alloy is reduced by two orders of magnitude, and the corrosion potential is more positive. Circular polarization curve indicates that there is no pitting in 0.5 mol/L H2SO4 solution, and the Titanium element provides guarantee for excellent corrosion resistance. (C) 2015 Elsevier B.V. All rights reserved.