Publication detail
Mechanical and Microstructural Characterization of Powder Metallurgy CoCrNi Medium Entropy Alloy
MORAVČÍK, I. ČÍŽEK, J. KOVACOVA, Z. HORNÍK, V. KUBĚNA, I. KITZMANTEL, E. NEJEZCHLEBOVÁ, J. NEUBAUER, E. DLOUHÝ, I.
English title
Mechanical and Microstructural Characterization of Powder Metallurgy CoCrNi Medium Entropy Alloy
Type
journal article in Web of Science
Language
en
Original abstract
The present study is focused on synthesis and mechanical properties characterization of equiatomic CoCrNi medium entropy alloy (MEA). Powder metallurgy processes of mechanical alloying (MA) with subsequent spark plasma sintering (SPS) for bulk alloy densification have been utilized. As opposed to the single-phase alloys of identical composition fabricated via casting routes, the alloy after SPS compaction consisted of a major FCC solid solution phase (94.4%), minor fraction of secondary BCC phase (5.6%, precipitated at the FCC grains boundaries), and negligible amount of oxide inclusions. The alloy exhibited high ultimate tensile strength of 1024 MPa and a elongation to fracture of 26%. Elastic modulus of the alloy reached 222 GPa and the thermal expansion coefficient (CTE) was measured as 17.4×10−6 K−1 The plastic deformation in the alloy is carried out by a combination of dislocation glide and mechanical nano-twinning at room temperature.
English abstract
The present study is focused on synthesis and mechanical properties characterization of equiatomic CoCrNi medium entropy alloy (MEA). Powder metallurgy processes of mechanical alloying (MA) with subsequent spark plasma sintering (SPS) for bulk alloy densification have been utilized. As opposed to the single-phase alloys of identical composition fabricated via casting routes, the alloy after SPS compaction consisted of a major FCC solid solution phase (94.4%), minor fraction of secondary BCC phase (5.6%, precipitated at the FCC grains boundaries), and negligible amount of oxide inclusions. The alloy exhibited high ultimate tensile strength of 1024 MPa and a elongation to fracture of 26%. Elastic modulus of the alloy reached 222 GPa and the thermal expansion coefficient (CTE) was measured as 17.4×10−6 K−1 The plastic deformation in the alloy is carried out by a combination of dislocation glide and mechanical nano-twinning at room temperature.
Keywords in English
tensile test; mechanical alloying; plasticity; mechanical characterization; powder metallurgy
Released
07.06.2017
Publisher
Elsevier
Location
London
ISSN
0921-5093
Volume
2017
Number
701
Pages from–to
370–380
Pages count
11
BIBTEX
@article{BUT137640,
author="Igor {Moravčík} and Jan {Čížek} and Zuzana {Kovacova} and Jitka {Nejezchlebová} and Michael {Kitzmantech} and Erich {Kitzmantel} and Ivo {Kuběna} and Vít {Horník} and Erich {Neubauer} and Ivo {Dlouhý},
title="Mechanical and Microstructural Characterization of Powder Metallurgy CoCrNi Medium Entropy Alloy",
year="2017",
volume="2017",
number="701",
month="June",
pages="370--380",
publisher="Elsevier",
address="London",
issn="0921-5093"
}