Manufacturing and characterization of high entropy alloys
DOI:
https://doi.org/10.18779/ingenio.v5i2.519Keywords:
High entropy alloys, mechanical alloying, aluminum, mechanical propertiesAbstract
High entropy alloys are a new kind of multicomponent alloys, consisting of five or more metallic elements with equiatomic proportions. Despite the large number of alloying elements, HEA can exhibit simple solid solution phases, such as face- and body-centered cubic phases. In this work, the AlxCrCuFeNiTi (x = 0, 0.45, 1, 2.5, 5 mol) alloy was fabricated by mechanical alloying to determine the effect of aluminum on the phase evolution during the process and its impact on the mechanical properties. Grinding of the powders was carried out at 300 rpm during 180 minutes. The powders resulting from milling were pressed at 250 kg/cm2. The pressed samples were sintered at 1,300°C during 1 hour. From results it can be seen that with increasing Al concentration, the alloys undergo a transformation from a single FCC phase to mixture of FCC and BCC phases, as well as the precipitation of FeAl3, Al3Ni, TiAl and Ti3Al intermetallics. The alloy that achieved the highest hardness was the one with the highest Al content. These alloys harden significantly with the addition of Al, due to the BCC phase formation and intermetallic compounds.
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