High entropy alloy nanocomposites produced by high pressure torsion. (15th April 2021)

• Record Type: Journal Article
• Authors: Taheriniya, Shabnam; Davani, Farnaz A.; Hilke, Sven; Hepp, Marco; Gadelmeier, Christian; Chellali, Mohammed Reda; Boll, Torben; Rösner, Harald; Peterlechner, Martin; Gammer, Christoph; Divinski, Sergiy V.; Butz, Benjamin; Glatzel, Uwe; Hahn, Horst; Wilde, Gerhard
• Is Part Of: Acta materialia. Volume 208(2021)
• Publication Date: 2021-04-15
• Subjects: Nanocomposites -- High entropy alloys -- High pressure torsion -- Dual-phase materials -- Heterodeformation; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2021.116714
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: High-pressure torsion was applied to join two disks of single-phase equiatomic fcc CoCrFeMnNi and bcc HfNbTaTiZr high entropy alloys (HEAs). After 15 revolutions a bulk nanocomposite had developed with alternating nano-lamellae of elongated nanocrystalline CoCrFeMnNi and mixed amorphous-nanocrystalline HfNbTaTiZr, exhibiting complex microstructures with numerous vortex-like regions. While the fcc phase retains a rather homogeneous elemental distribution, the former bcc high entropy alloy experiences a chemical separation towards Ta-rich and Ta-poor phases. The joining of dissimilar HEAs under constrained conditions (cold shut) enables the design of novel HEA-based composites by non-equilibrium processing. Graphical abstract: Image, graphical abstract