Abstract
This study investigates the deformation mechanisms of three additively manufactured FeMnCoCr multiprincipal element alloys (MPEAs), each with distinct grain sizes achieved through metastability engineering and unique deformation mechanisms. The Fe35Mn45Co10Cr10 composition serves as a baseline for comparison, exhibiting intermediate mechanical properties and deformation primarily through slip. In contrast, the Fe40Mn40Co10Cr10 composition relies on twinning mechanisms to accommodate strain and enhance work hardening. However, the Fe30Mn50Co10Cr10 composition demonstrates that grain refinement, facilitated by a body-centered cubic to face-centered cubic transformation during solidification, is more effective in improving the yield strength of the material. This comparative analysis underscores the effectiveness of grain refinement and twinning in optimizing the mechanical properties of additively manufactured MPEAs.
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