Microstructure and Hardness Evolution of AlCrMnV-based Lightweight High Entropy Alloy through Titanium Alloying
Öz
HHigh-entropy alloys (HEAs) exhibit unique mechanical properties such as strength-ductility balance. Recently, light HEAs have attracted attention due to their low density and characteristic properties. In this study, Ti was gradually added to lightweight (AlCrMnV)100-xTix(x=0, 5, 25, 50 at. %) HEAs and produced by the arc melting method, and the effect of Ti addition on structural and mechanical properties was examined. Phase analysis, microstructures and compositional heterogeneity of the cast samples were determined by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometry (EDS), respectively. The hardness of the casting samples was determined by the Vickers hardness test. The results showed that V-Cr and Al-Mn rich regions were observed in the AlCrMnV sample, while no segregation was observed in the (AlCrMnV)95Ti5 sample. As the titanium content increased, the lattice parameter of the structure increased, causing the diffraction peaks to shift to the left. Accordingly, when the Ti content was increased from 0 at. % to 25 at. %, the hardness of the casting samples increased from 471 HV to 494 HV, respectively. Ingot cast structures, columnar at the edges, and dendritic structures, at the center zones were obtained in samples with 5 at% and 50 at.% Ti. The addition of titanium has a substantial impact on the structural and mechanical properties of (AlCrMnV)100-xTix.
Anahtar Kelimeler
High Entropy Alloy, Lightweight alloys, Hardness, Microstructure
Kaynakça
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