Abstract
In order to improve the mechanical strength of Cantor alloy and obtain the uniform microstructure, about 9.1 at.% of Al element was introduced and a new CoCrNiFeMnAl0.5 HEAs was prepared by gas atomization combined with oscillatory pressure sintering. The effects of powder sizes on the microstructure and mechanical properties of the as-sintered alloys were investigated and the corresponding strengthening mechanism was discussed. The results show that the CoCrNiFeMnAl0.5 HEAs were composed of FCC phase with good plasticity and BCC phase with high strength. The as-sintered alloys have higher relative density and uniform microstructure without the defects of composition segregation and coarse structure like the as-cast alloy. The yield strength and microhardness of the as-sintered alloys increased to 775 MPa and 369.3 HV, which were 173% and 104% higher than that of the as-cast alloy, respectively. It is indicated that the strength and microhardness of the as-sintered alloys depend on the powder sizes. The strengthening mechanisms of the as-sintered alloys were mainly attributed to the second phase strengthening and the grain boundary strengthening.
Published Version
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