Tensile properties of the Cr–Fe–Ni–Mn non-equiatomic multicomponent alloys with different Cr contents

Highlights: • A series of Fe₄₀Mn₂₈Ni_{32 − x}Cr_x (x = 4, 12, 18, 24 (at.%)) alloys are examined. • The Fe₄₀Mn₂₈Ni_{32 − x}Cr_x (x = 4, 12, 18) alloys are ductile fcc solid solutions. • Yield strength of Fe₄₀Mn₂₈Ni_{32 − x}Cr_x (x = 4, 12, 18) alloys increases with Cr content. • Increase of yield strength is attributed to solid solution strengthening. • The Fe₄₀Mn₂₈Ni₈Cr₂₄ alloy has intermetallic sigma phase matrix and is brittle. - Abstract: A series of Fe₄₀Mn₂₈Ni_{32 − x}Cr_x (x = 4, 12, 18, 24 (at.%)) multicomponent alloys was prepared by vacuum arc melting. The Fe₄₀Mn₂₈Ni₂₈Cr₄, Fe₄₀Mn₂₈Ni₂₀Cr₁₂ and Fe₄₀Mn₂₈Ni₁₄Cr₁₈ alloys were ductile single phase fcc solid solutions. The Fe₄₀Mn₂₈Ni₈Cr₂₄ alloy had intermetallic sigma phase matrix and was extremely brittle after homogenization. The tensile properties of the Fe₄₀Mn₂₈Ni₂₈Cr₄, Fe₄₀Mn₂₈Ni₂₀Cr₁₂ and Fe₄₀Mn₂₈Ni₁₄Cr₁₈ solid solution alloys were examined in recrystallized condition with average grain size of ~ 10 μm. The yield strength increased from 210 MPa of the Fe₄₀Mn₂₈Ni₂₈Cr₄ alloy to 310 MPa of the Fe₄₀Mn₂₈Ni₁₄Cr₁₈ alloy. The elongation to fracture of the alloys decreased from 71% to 54%, respectively. Solid solution strengthening by the constitutive elements of the alloys was calculated using Labush approach. Strong solid solution strengthening by Cr was predicted. Gypen and Deruyttere approach was used to estimate solid solution strengthening of the Fe₄₀Mn₂₈Ni_{32 − x}Cr_x alloys. Good correlation between predicted solid solution strengthening and the experimental yield strength values was found.