Evaluation of microstructure and mechanical property variations in AlxCoCrFeNi high entropy alloys produced by a high-throughput laser deposition method
By Mu Li, J. Gázquez, A. Borisevich, Rohan Mishra, K. Flores. 2017
142 citations recorded by the source corpus.
Abstract Twenty-one distinct AlxCoCrFeNi alloys were rapidly prepared by laser alloying an equiatomic CoCrFeNi substrate with Al powder to create an alloy library ranging x = 0.15–1.32. Variations in crystal structure, microstructure and mechanical properties were investigated using X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy and nanoindentation. With increasing Al content, the crystal structure transitioned from a disordered FCC to a mixture of disordered BCC and ordered B2 structures. While the onset of BCC/B2 formation was consistent with previously reported cast alloys, the FCC structure was observed at larger Al contents in the laser processed materials, resulting in a wider two phase regime. The FCC phase was primarily confined to the BCC/B2 grain boundaries at these high Al contents. The nanoindentation modulus and hardness of the FCC phase increased with Al content, while the properties of the BCC/B2 structure were insensitive to composition. The structure and mechanical properties of the laser-processed alloys were surprisingly consistent with reported results for cast alloys, demonstrating the feasibility of applying this high-throughput methodology to multicomponent alloy design.
Subfields: Aerospace Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/557b66e16b5271f5790d94b10eb147dae57d3b27
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Citations in the corpus
- High-throughput synthesis of Mo-Nb-Ta-W high-entropy alloys via additive manufacturing (2020, background): “More recent work has sought to produce arrays of discrete material compositions by depositing varying amounts of a single elemental powder onto a metallic substrate and alloying the powder into the substrate by laser melting [20], however, such techniques are limited to producing patches of alloyed ”