Publication detail

Microstructure and mechanical properties of Ni1,5Co1,5CrFeTi0,5 high entropy alloy fabricated by mechanical alloying and spark plasma sintering

MORAVČÍK, I. ČÍŽEK, J. ZAPLETAL, J. KOVACOVA, Z. VESELY, J. MINÁRIK, P. KITZMANTECH, M. NEUBAUER, E. DLOUHÝ, I.

Original Title

Microstructure and mechanical properties of Ni1,5Co1,5CrFeTi0,5 high entropy alloy fabricated by mechanical alloying and spark plasma sintering

Type

journal article in Web of Science

Language

English

Original Abstract

The present work is focused on synthesis and mechanical properties evaluation of non-equiatomic Ni1,5Co1,5CrFeTi0,5, ductile single phase high entropy alloy (HEA) with excellent mechanical properties (bend strength Rmb = 2593 MPa, tensile strength Rm = 1384 MPa, tensile elongation to fracture of 4.01%, and elastic modulus of 216 GPa) surpassing those of traditional as-cast HEA. For the alloy production, a combination of mechanical alloying (MA) process in a planetary ball mill and spark plasma sintering (SPS) for powder densification was utilized. The tensile properties of a bulk material produced by a combination of MA+SPS are characterized for the first time. The feedstock powder and corresponding bulk material microstructure, elemental and phase composition, and mechanical properties were investigated by scanning (SEM) and transmission (TEM) electron microscopy, energy-dispersive X-ray spectroscopy (EDX), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), aswell as impulse excitation of vibration, Vickers microhardness and tensile and bend strength tests, respectively. The structure of the samples consisted of single-phase FCC high entropy solid solution of extremely fine-twinned grains and oxide inclusions inherited from the original powder feedstock. Dimple-like morphology corresponding to ductile fracture mode has been observed on the fracture surfaces, with crack initiation sites on the inclusions phases.

Keywords

Multi principal element alloy Tensile strength Fracture Ductility

Authors

MORAVČÍK, I.; ČÍŽEK, J.; ZAPLETAL, J.; KOVACOVA, Z.; VESELY, J.; MINÁRIK, P.; KITZMANTECH, M.; NEUBAUER, E.; DLOUHÝ, I.

Released

16. 1. 2017

Publisher

ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

Location

OXON, ENGLAND

ISBN

1873-4197

Periodical

MATERIALS & DESIGN

Year of study

119

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

141

Pages to

151

Pages count

10

URL

http://www.sciencedirect.com/science/article/pii/S0264127517300461

BibTex

@article{BUT135301,
  author="Igor {Moravčík} and Jan {Čížek} and Josef {Zapletal} and Zuzana {Kovacova} and Jozef {Vesely} and Peter {Minárik} and Michael {Kitzmantech} and Erich {Neubauer} and Ivo {Dlouhý}",
  title="Microstructure and mechanical properties of Ni1,5Co1,5CrFeTi0,5 high entropy alloy fabricated by mechanical alloying and spark plasma sintering",
  journal="MATERIALS & DESIGN",
  year="2017",
  volume="119",
  number="1",
  pages="141--151",
  doi="10.1016/j.matdes.2017.01.036",
  issn="1873-4197",
  url="http://www.sciencedirect.com/science/article/pii/S0264127517300461"
}

Documents

1-s2.0-S0264127517300461-main.pdf