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Excellent strength-ductility synergy in metastable high entropy alloy by laser powder bed additive manufacturing
P. Agrawal, S. Thapliyal, , R.S. Mishra, B.A. McWilliams, K.C. Cho
Published in Elsevier B.V.
Volume: 32
High entropy alloys (HEAs) have attracted scientific interest due to their good mechanical properties and failure resistance, whereas additive manufacturing (AM) has emerged as a powerful yet flexible processing route for advanced materials. However, limitations inherent in both these fields include HEAs display inferior mechanical properties in as cast condition; and AM demands expansion of printable alloys. A new metastable Fe40Mn20Co20Cr15Si5 (CS-HEA) HEA showing stabilized ε-h.c.p. dominated microstructure after laser powder bed fusion additive manufacturing has been evaluated. As-printed CS-HEA showed higher strength due to high work hardenability, whereas substantial uniform ductility is associated with a combination of transformation and twinning induced plasticity during deformation. Additionally, very low volume percent of voids (∼0.1 %) along with high strength-ductility shows excellent printability of the CS-HEA using laser-based additive manufacturing. © 2020 Elsevier B.V.
About the journal
JournalData powered by TypesetAdditive Manufacturing
PublisherData powered by TypesetElsevier B.V.