研究目的
Investigating the microstructure-processing-property relationships in multiprincipal element alloys using laser processing as a high-throughput method.
研究成果
Laser processing is an effective method for rapidly and efficiently evaluating multiprincipal element alloys and their microstructures. The microstructural feature sizes follow a power law relationship with the quench rate, and the microhardness follows a Hall-Petch relationship with cell size.
研究不足
The study focuses on a specific range of compositions and quench rates, and the results may not be generalizable to all multiprincipal element alloys. The microhardness measurements are limited by the size of the microstructural features.
1：Experimental Design and Method Selection:
A direct laser deposition processing method was applied to construct compositional and microstructural libraries of AlxCoCrFeNi. The quench rate was varied by adjusting the laser power and travel speed during remelting of the compositional library.
2：Sample Selection and Data Sources:
Raw materials including cobalt, chromium, iron, and nickel were arc-melted to produce equimolar alloy buttons, which were then melted together and cast into a copper mold.
3：List of Experimental Equipment and Materials:
An Optomec MR-7 LENS? system was used for laser processing. Gas-atomized aluminum powder was deposited into the melt pool.
4：Experimental Procedures and Operational Workflow:
The alloy libraries were prepared by creating a melt pool on the surface of the CoCrFeNi substrate and depositing aluminum powder in overlapping parallel lines. The libraries were then remelted using different combinations of laser powers and travel speeds.
5：Data Analysis Methods:
The microstructural variations were characterized using a field emission scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD). The microhardness was measured using a Vickers diamond pyramid.
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