Details

Autor(en) / Beteiligte

• Dan Sathiaraj, G.
• Skrotzki, Werner
• Pukenas, Aurimas
• Schaarschuch, Rolf
• Jose Immanuel, R.
• Panigrahi, S.K.
• Arout Chelvane, J.
• Satheesh Kumar, S.S.

Titel

Effect of annealing on the microstructure and texture of cold rolled CrCoNi medium-entropy alloy

Ist Teil von

• Intermetallics, 2018-10, Vol.101, p.87-98

Ort / Verlag

Barking: Elsevier Ltd

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The microstructure, texture and mechanical properties of medium-entropy ternary CrCoNi alloy after cold rolling and annealing were investigated. The cold rolled material shows a heavily fragmented microstructure coexisting with fine scale shear bands. The deformation texture is a ɑ-fibre with a spread between the Goss and Brass component. This type of texture during cold rolling is direct evidence of a low stacking fault energy of the CrCoNi alloy. Annealing at 700 °C yields a fully recrystallized ultrafine grained microstructure with a large fraction of annealing twins. Annealing twins play a significant role in the evolution of the annealing texture. They lead to the emergence of new orientations which have first order twin relationship (60° rotation) with the ɑ-fibre rolling texture components. Typical brass recrystallization texture BR {236} component does not develop during recrystallization unlike in other low SFE alloys such as brass, Ag and Cu alloys. New prominent twin related orientations are retained with increasing annealing temperature due to the hindrance of preferential growth of certain crystallographic orientations. Tensile tests show that this alloy exhibits ultra-high strength and good ductility. •The microstructure and texture formation during annealing of cold rolled CrCoNi MEA is reported in detail for the first time.•Cold rolled sheet shows the profuse fine-scale deformation heterogeneities and the formation of a α-fibre type texture.•A fully recrystallized ufg structure is obtained by conventional cold rolling and subsequent annealing.•The recrystallization twinning mechanism is much more active than grain boundary nucleation during recrystallization.•The overall evolution of annealing texture is weak.