Microstructures and compressive properties of multicomponent AlCoCrFeNiMox alloys

▶ The effects of Mo element on structure and properties of AlCoCrFeNi alloy that did not contain Cu element were investigated in details in this work originally. ▶ Only BCC and α phases are identified, and the total number of phases is well below the maximum equilibrium number allowed by Gibbs phase rule. ▶ The yield strength of alloy increases from 1051 MPa to 2757 MPa and the compressive fracture strength of alloy increases from 2280 MPa to 3036 MPa with the increase of Mo addition, among which the Mo0.3 alloy exhibits highest strength up to 3208 MPa. Multicomponent AlCoCrFeNiMo x ( x values in molar ratio, x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) alloys were prepared using a well-developed copper mould casting. The effects of Mo element on the structure and properties of AlCoCrFeNi alloy were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimeter (DSC). It was found that Mo addition took significant effects on the structure and properties of AlCoCrFeNi alloy. Mo 0.1 alloy, similar to Mo 0 alloy, was of single BCC solid solution structure. When Mo content was more than 0.1, the alloy exhibited a typical laminar eutectic structure. The alloy strength was improved obviously, but the ductility of alloy was lowered at the same time. The maximum yield strength reached 2757 MPa when Mo content was 0.5, and the maximum compressive fracture strength reached 3208 MPa when Mo content was 0.3. The strengthening effect and mechanism of Mo addition on AlCoCrFeNi alloy were discussed from different aspects.