Abstract
Selective laser melting (SLM) to fabricate Al0.5CoCrFeNi high entropy alloys with pre-mixed powders was studied in this paper. The influences of process parameters including laser power, scanning speed, and hatch spacing on the relative density of high-entropy alloys (HEAs) were investigated. A relative density of 99.92% can be achieved by optimizing the SLM process parameters with laser power 320 W, scanning speed 800 mm/s, and hatch spacing of 60 μm, respectively. Moreover, the microstructure of the HEAs was also studied using scanning electron microscopy (SEM) and x-ray diffraction (XRD). It was found that the microstructure of the HEAs was only composed of face-centered cubic and body-centered cubic phases, without complex intermetallic compounds. The mechanical properties of the HEAs were also characterized. At ambient temperature, the alloys had a high yield strength of about 609 MPa, tensile strength about 878 MPa, and hardness about 270 HV. Through a comparison with the corresponding alloys fabricated by vacuum induction melting, it can be concluded that the high entropy alloys fabricated by SLM had fine microstructures and improved mechanical properties.
Highlights
Traditional alloy design is limited to one element as the main component with the addition of another or more of the metallic and non-metallic elements to obtain a particular performance
Through a comparison with the corresponding alloys fabricated by vacuum induction melting, it can be concluded that the high entropy alloys fabricated by Selective laser melting (SLM) had fine microstructures and improved mechanical properties
The crystal structure of the high entropy alloys (HEAs) was analyzed by x-ray diffractometer (XRD, Bruker D8 Advance, Karlsruhe, Germany) with Cu Kα radiation operating at 40 kV/20 mA at a scanning speed of 4◦ /min from 2θ = 20◦ ~100◦
Summary
Traditional alloy design is limited to one element as the main component with the addition of another or more of the metallic and non-metallic elements to obtain a particular performance. SLM is a layer-by-layer processing technology based on slice data prepared by 3D computer aided design data It has evident advantages such as high molding speed, good utilization rate of materials, and the ability of forming complex parts. Boundaries are preferred regions for crack propagation [9] It seems that fabricating HEAs. Great efforts have been made in studying the laser processing of HEAs in recent years [10,11,12,13,14]. By Joseph et al [11], and processing parameters the fabricated laser on the microstructure hardness of high-entropy alloys were theexamined. SLM samples showed anpowders excellent has combination high strength and excellent theHEA fabrication of and HEAs with pre-mixed not been of reported. The fabrication of Al0.5CoCrFeNi HEAs by SLM with the pre-mixed powders was studied.
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