Compositional Modifications to Alter and Suppress Laves Phases in Al_xCrMoTa_yTi Alloys

Abstract

Herein, the development of refractory complex concentrated alloys in the Al–Cr–Mo–Ta–Ti alloy system is reported. Alloys with modified Al and Ta concentrations are designed using CALPHAD tools and produced via arc melting and characterized in both as‐cast and annealed forms. Properties of the alloys, nature of the microstructures, and phase transformation behavior are described via X‐ray diffraction, microstructural characterization, microhardness, and differential scanning calorimetry. Two alloys, namely, Al0.25CrMoTa0.8Ti and Al0.75CrMoTa0.8Ti, are represented by a body‐centered‐cubic matrix phase after annealing, along with a secondary Cr–Ta Laves phase of the C15 and C14 polytypes, respectively. In as‐cast and annealed forms, the Al0.75CrMoTa0.45Ti alloy comprises a single‐bcc phase. Microhardness of the Laves phase containing alloys demonstrates susceptibility to cracking, whereas the Al0.75CrMoTa0.45Ti alloy displays high specific hardness, signs of ductility as evidenced by slip traces near indentations, and minimal scatter of hardness values.

Unveiling the mechanism of tuning elemental distribution in high entropy alloys and its effect on thermal stability

“…Experimental observations have indicated the occurrence of secondary phases in HEAs during heat treatment. 55–57 Consequently, we investigated the influence of the SRO effect at different temperatures on the thermal stability of the system. Based on the schematic of the addition of Cr/Mn into the CoFeNi alloy in Fig.…”

Corrosion Behavior of As-Cladding Al0.8CrFeCoNiCu0.5Six High Entropy Alloys in 3.5% NaCl Solution

“…Compared with traditional alloys, high-entropy alloys exhibit a high-entropy effect, sluggish diffusion effect, and lattice distortion effect, which can suppress the formation of ordered intermetallic compounds during the solidification process, favoring the formation of simple solid-solution structures. By reasonably adjusting the element ratios, high-entropy alloys can demonstrate excellent properties such as high hardness 4 , high strength 5 , corrosion resistance 6 , and outstanding wear resistance. Therefore, high-entropy alloys hold great potential for application in laser cladding materials.…”