A very interesting phenomenon, for the existing high-entropy alloy design, the use of more elements are Fe, Ni, Co, Cr, Mn, Al, V, Ti, Zr, etc. However, the Mg element is rarely found in HEAs. Why is this?
Yunjian Bai Mg is not commonly used in high-entropy alloy (HEA) designs due to its large atomic radius, high chemical reactivity, limited alloying behavior, and lower mechanical properties. Its large atomic radius can cause lattice misfit, leading to instability, and its high chemical reactivity can cause unwanted oxide or hydroxide phases.Therefore, Mg-containing HEAs are less attractive for practical use.
Dear Alvina, Thank you for your insightful reply. I would like to know, since the lattice distortion effect is a major property of high-entropy alloys, whether the severe lattice distortion introduced due to the Mg element would be more effective in hindering dislocation motion, thus substantially increasing the yield strength. Alvena Shahid
look at the binary phase diagrams. There are only few elements showing complete solid solubility with Mg. It exists for Cd, but I do not know other elements. Also take into account the electropositive character of Mg, leading in many cases also to compound formation.
I think it may be stems from the HCP crystal structure of Mg, in contrast to the fcc or bcc structures of other metals. Given the relatively low solubility of Mg in these metals, it tends to form intermetallic compounds rather than solid solutions, thus rendering it less favored for incorporation into HEAs.
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