Study to Microstructure and Mechanical Properties of Mg Containing High Entropy Alloys

Abstract

In this paper, alloys with compositions of Mgx(MnAlZnCu)100-x (x: atomic percentage; x=20, 33, 43, 45.6 and 50 respectively) were designed by using the strategy of equiatomic ratio and high entropy of mixing. Microstructure and mechanical properties of the new high entropy alloy were studied. The alloys were prepared by induction melting and then were cast in a copper mold in air. The alloy samples were examined by microhardness tester, XRD, SEM, thermal analyzer and testing machine for material strength. Alloys were composed mainly of h.c.p phase and Al-Mn icosahedral quasicrystal phases. The alloys exhibited moderate densities which were from 4.29g•cm-3 to 2.20g•cm-3, high hardness (429HV-178HV) and high compression strength (500MPa-400MPa) at room temperature. The extensibility was increased with Mg from 20at% (atomic percentage) to 50at%.

A Novel Low-Density, High-Hardness, High-entropy Alloy with Close-packed Single-phase Nanocrystalline Structures

“…It had a density of 3.91 g cm −3 . Li et al [8,9] studied Mg-containing HEAs. These authors prepared Mg x (MnAlZnCu) 100−x alloys by induction melting and casting.…”

“…These authors prepared Mg x (MnAlZnCu) 100−x alloys by induction melting and casting. [8] The alloys had multi-phase structures, composed mainly of hcp phases and Al-Mn icosahedral quasicrystalline phases. Depending on the composition, the alloys had densities of 2.20-4.29 g cm −3 .…”

An Insight into Evolution of Light Weight High Entropy Alloys: A Review

“…The theoretical criterion for the solid solution structure also predicts the BCC structure for this alloy as VEC = 4.24 (<6.87). Li et al [27] synthesized HEA using Mg with equiatomic AlCuMnZn alloy in different atomic percentage from 20 to 50. It was found that microstructure contains Al-Mn icosahedral phase which was a thermally-stable phase and a HCP phase in Mg 20 (AlCuMnZn) 80 alloy.…”

“…Sputtering, plasma nitriding, and cladding are the surface modification techniques used to produce thin films and thick layers of HEAs on various substrates. For LWHEA, an addition of low-density metals (Mg, Al, Ti, Be, Sc, and Li) is the criterion for designing, therefore, vacuum arc melting and mechanical alloying followed by sintering are the two main processing techniques that have been used by researchers [22][23][24][25][26][27][28][29].…”

“…Therefore, homogenization treatment has to be performed to reduce the effect of heterogeneity in the microstructure. Some other alloys including Al 20 Be 20 Fe 10 Si 15 Ti 35 and Mg x (AlCuMnZn) 100−x were also synthesized using induction melting and casting route [26,27].…”