Abstract
In the present investigation, CoCrCuFeNi based multicomponent nano-scale Y2O3–Ti dispersed oxide dispersion strengthened (ODS) alloys were prepared by mechanical alloying followed by spark plasma sintering (SPS) at three different temperatures (900 °C, 1000 °C and 1100 °C). The microstructures of the as processed SPS samples primarily consist of a combination of F1 and F2 based FCC phases in the matrix in addition to a minor amount of second (Co14·2Cr2·7Y2) phase. Further TEM analysis indicates bimodal grain size distribution with an increasing trend in grain size from 0.110 μm to 0.883 μm with an increase in sintering temperature. The best combination of ultimate compressive strength (1555 MPa) and hardness (468 HV) of the SPS processed bulk ODS-HEA has been obtained when sintered at 1000 °C. The contribution in yield strength has been estimated using three strengthening mechanisms and the Orowan strengthening model is the most dominating strengthening mechanism in the present ODS-HEA.
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