The Effect of Mn Content on the Microstructure and Properties of CoCrCu0.1Fe0.15MO1.5MnxNi, Near Equiatomic Alloys

The effect of Mn content on the microstructure and properties of a newly-designed CoCrCu0.1Fe0.15Mo1.5MnxNi (where x is atomic ratio, x = 0.05, 0.12 and 0.3) near equiatomic alloys are investigated in this study. Typical dendrites and interdendritic structures are observed. According to EDS, the primary dendrites are enriched with Co and Mo, while at the interdendritic region Cr-rich and (Co, Fe, Ni)-rich structures are obtained. The X-ray diffraction patterns of the CoCrCu0.1Fe0.15Mo1.5MnxNi alloys indicate that all the alloys exhibit simple BCC, FCC solid solution phase and mu phase. The volume fraction of FCC phase increases when Mn element was added, confirming that Mn is a FCC-forming element. Notely, the hardness of the alloys dropped from HV 715 to HV 392 when the Mn content changed from 0.05 to 0.3. The wear resistance declines as the Mn content increases. The optimal wear resistance was obtained in CoCrCu0.1Fe0.15Mo1.5Mn0.05Ni near equi-atomic alloys.