Effect of Mo on microstructure and properties of as-cast(Fe50Mn30Co10Cr10)98-xC2 Mox multi-principal element alloys
The as-cast(Fe50Mn30Co10Cr10)98-xC2Mox multi-principal element alloys was prepared by vacuum arc melting furnace.The effects of Mo addition on the microstructure and propeties of as-cast multi-principal element alloy were analyzed,and the strength tough-ness and microstructure evolution mechanism of multi-principal element alloys were studied.The results show that as-cast(Fe50Mn30Co10Cr10)98C2Mo1 alloy is face-centered cubic phase structure.During the tensile deformation process at room temperature,the deformation twins of 60°<111>increases,which induces the twining induced plasticity(TWIP)effect.Under the combined action of grain boundary strengthening(twin grain boundaries are lineage boundary),solution strengthening(C-gap atom,Mo-substitutional at-om),dislocation strengthening and TWIP effect,the ultimate tensile strength of as-cast alloy reaches 712.08 Mpa and the overall elon-gation is 98.63％.The product of strength and elongation is as high as 70.23 Gpa·％.As the Mo content increases to 2％,the transi-tion degree from small angle grain boundary to large angle grain boundary is decreased,and white granular intermetallic compounds pre-cipitate in the alloy,which leads to the decrease of the yield strength,tensile strength and plasticity of the alloy.
Moproduct of strength and elongationdeformation twinsTWIP effect
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