Fabricating Homogeneous FeCoCrNi High-Entropy Alloys via SLM In Situ Alloying

Selective laser melting (SLM) in situ alloying is an effective way to design and fabricate novel materials which the elemental powder adopted as raw material micro-areas of blend are alloyed synchronously forming process selective (SLM). The pre-alloying preparation can be left out, a batch bulk samples prepared via technology combined with quantitative mixing feeding. technique applied high-throughput sample efficiently obtain microstructure performance data for design. In present work, equiatomic FeCoCrNi high-entropy alloys different processing parameters were fabricated alloying. Finite element simulation CALPHAD calculation used determine appropriate SLM post-heating parameters. SEM (scanning electron microscope), EDS (energy dispersive spectroscopy), XRD (X-ray diffraction), mechanical testing characterize composition, microstructure, properties as-printed post-heat-treated samples. experimental results show that composition deviation could controlled within 20 wt %. crystal structure single-phase face-centered cubic (FCC), same those by traditional method. comparable much higher than method (arc melting). As-printed get homogeneous under optimal post-heat treatment at 1200 °C h.