|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Evaluation of Microstructure and Mechanical Property Variations in AlxCrCoFeNi High Entropy Alloys by a High-throughput Laser Deposition Method
||Mu Li, Rohan Mishra, Katharine M Flores
|On-Site Speaker (Planned)
Twenty-one distinct AlxCoCrFeNi high entropy 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, 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 decreased slightly.
||Planned: Supplemental Proceedings volume