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.

Original Title

Mechanical and Microstructural Characterization of Powder Metallurgy CoCrNi Medium Entropy Alloy

Type

journal article in Web of Science

Language

English

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.

Keywords

tensile test; mechanical alloying; plasticity; mechanical characterization; powder metallurgy

Authors

MORAVČÍK, I.; ČÍŽEK, J.; KOVACOVA, Z.; HORNÍK, V.; KUBĚNA, I.; KITZMANTEL, E.; NEJEZCHLEBOVÁ, J.; NEUBAUER, E.; DLOUHÝ, I.

Released

7. 6. 2017

Publisher

Elsevier

Location

London

ISBN

0921-5093

Periodical

Materials Science and Engineering A

Year of study

2017

Number

701

State

Swiss Confederation

Pages from

370

Pages to

380

Pages count

11

URL

https://doi.org/10.1016/j.msea.2017.06.086

BibTex

@article{BUT137640,
  author="Igor {Moravčík} and Jan {Čížek} and Zuzana {Kovacova} and Jitka {Nejezchlebová} and Michael {Kitzmantech} and Erich {Neubauer} and Ivo {Kuběna} and Vít {Horník} and Ivo {Dlouhý}",
  title="Mechanical and Microstructural Characterization of Powder Metallurgy CoCrNi Medium Entropy Alloy",
  journal="Materials Science and Engineering A",
  year="2017",
  volume="2017",
  number="701",
  pages="370--380",
  doi="10.1016/j.msea.2017.06.086",
  issn="0921-5093",
  url="https://doi.org/10.1016/j.msea.2017.06.086"
}

Documents

1-s2.0-S0921509317308535-main.pdf