Abstract
In this study, the AlCrCuFeNi high entropy alloy (HEA) with two FCC and BCC crystalline phases was successfully synthesized through 60 h of mechanical alloying (MA) followed by spark plasma sintering (SPS). After the sintering process, these solid solutions underwent further transformation, resulting in the coexistence of FCC, BCC, and σ phases. This highlights the considerable significance of considering mixing enthalpy in the context of determining phase formation in HEAs. The mechanical properties of the bulk specimen were assessed using nano-hardness, micro-hardness, and shear punch tests, yielding mean values of 781 ± 10 Vickers for nano-hardness and 762 ± 10 Vickers for micro-hardness. Additionally, the alloy exhibited a yield tensile strength of 367 ± 4 MPa and an ultimate tensile strength of 445 ± 5 MPa. Examination of fracture surface of the sintered HEA illustrated cleavage fractures, likely attributed to the presence of the BCC phase. Furthermore, the tribological behavior of the alloy was investigated through pin-on-disk wear tests at different temperatures (ambient, 250 °C, and 500 °C). The results indicated a shift in the wear mechanism and an increase in the coefficient of friction with rising temperature. These changes correlated with the temperature-dependent increase in the volume fraction of the FCC phase, as observed in XRD patterns, suggesting its potential influence on altering the wear mechanism. Eventually, the magnetic behavior of the alloy was analyzed using vibration sample magnetometer (VSM) analysis, confirming its ferromagnetic behavior.
Published Version
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