Effect of Mn Content on Microstructure and Mechanical Properties of FeMnCoCr Series As-cast Dual-phase High-entropy Alloys AITranslate

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Chinese Library Classification Number:TG135[一般工业技术—材料科学与工程]

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The effect of Mn content on microstructure and mechanical properties of FeMnCoCr series as-cast dual-phase high-entropy alloys was investigated by testing means of XRD,BSE and EBSD,and tensile experiments.The results show that with the decrease of Mn content,FCC phase and HCP phase in the high-entropy alloys transform to BCC phase,and there is only a single BCC phase in Fe₇₀Mn₁₀Co₁₀Cr₁₀ alloy.The crystal structure of Fe₅₃Mn₂₇Co₁₀Cr₁₀,Fe₅₅Mn₂₅Co₁₀Cr₁₀and Fe₅₈Mn₂₂Co₁₀Cr₁₀ alloys has little change after deformation.Part of FCC phase in Fe₆₀Mn₂₀Co₁₀Cr₁₀alloy transforms into HCP phase after deformation,and the phase variation is about 10%.FCC phase and HCP phase simultaneously transform into BCC phase during deformation of Fe₆₅Mn₁₅Co₁₀Cr₁₀,which causes TRIP effect and alloy elongation of 42%.When the Mn content(molar fraction)changes from 20%to 27%,the yield strength of the high-entropy alloys gra-dually decreases,and both the tensile strength and elongation decrease at first and then increase.With the further decrease of Mn content from 20%,the tensile strength of the high-entropy alloys still shows an increasing trend.