Fig. 2: Temperature of the heat-concentrated zone and the heating and cooling process of the metal powders.
From: Ultrahigh-temperature melt printing of multi-principal element alloys
a Photograph of the heat-concentrated heater extruding a melted bulk MPEA droplet. When applying a voltage, the heat is concentrated in the column region, emitting a bright light, while the edges of the carbon felt with lower electrical resistance remain dark. b Temperature mapping of the heating source at different input powers (~150 W, ~400 W, ~800 W, ~2000 W, from left to right). c Schematic of the metal powders traveling through the heating zone, the length of which is ~2 cm. d Simulated temperatures of 1-µm-diameter metal powders (Cr, Co, Fe, Ni, Al, Si) as a function of the travel time through the heater with a temperature of 2500 K. For all six elemental powders modeled, it takes <6 ms to reach their melting point (marked by the star symbols). e Simulation of the temperature of a printed NiFeCrCo MPEA half sphere (diameter = 6 mm) on a ceramic substrate during cooling.
