Development of ultra-hard multi-component alloys
Source abstract
Abstract
New metallic alloys were developed based on the lattice occupancy alloy project employing up to 9 distinct elements aiming to obtain solid solution phases in body-centered cubic structures. The alloy project also considers one element repeated 3 times in the molar base. Two selected alloys were characterized by scanning electron microscopy and X-ray diffraction, revealing there are 2 or 3 solid solution phases, which were indexed as body-centered cubic systems. As-cast and carburized alloys of extreme hardness were obtained from Hv = 13.9 to 24.6 GPa with reasonable fracture toughness, close to 10 MPa m1/2. The 9-element alloy was hardened after 1300 °C treatment, which indicates resistance to high-temperature applications. Chromium equivalent equation was found to be the key parameter in selecting the alloy elements in order to harden the alloys and increase solid solubility. The new alloys are the hardest metallic materials ever known, with promising applications.
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Research context
OpenAlex topics: High Entropy Alloys Studies · Advanced materials and composites · Advanced Materials Characterization Techniques
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