Publication detail

High-strength Al0.2Co1.5CrFeNi1.5Ti high-entropy alloy produced by powder metallurgy and casting: A comparison of microstructures, mechanical and tribological properties

MORAVČÍKOVA DE ALMEIDA GOUVÊA, L. MORAVČÍK, I. OMASTA, M. VESELY, J. ČÍŽEK, J. MINÁRIK, P. ČUPERA, J. ZÁDĚRA, A. JAN, V. DLOUHÝ, I.

Original Title

High-strength Al0.2Co1.5CrFeNi1.5Ti high-entropy alloy produced by powder metallurgy and casting: A comparison of microstructures, mechanical and tribological properties

Type

journal article in Web of Science

Language

English

Original Abstract

This work presents an in-depth comparison of the microstructural origins of high strength and high wear re-sistance in the Al0.2Co1.5CrFeNi1.5Ti high-entropy alloy produced by powder metallurgy (PM) and casting.The PM alloy microstructure is composed almost exclusively offine-grained FCC phase with minor, in-situformed TiC particles. The latter is responsible for a grain-boundary pinning effect and, consequently, the high-hardness of 712 HV was achieved allied with excellentflexural strength (2018 MPa) and elastic modulus of258 GPa. Its wear properties surpass those of the wear-resistant AISI 52100 steel under 1.2 N load. Despite thehigh strength properties of PM alloy, a ductile fracture behaviour was retained.In contrast, the cast alloy is composed of a coarse-grained dendritic microstructure of FCC matrix containing acomplex of intermetallic phases. Its tribological properties are superior to traditional AISI 52100 steel under allsliding conditions, exhibiting the best results among all tested materials. However, its elastic modulus (210 GPa)andflexural strength (1101 MPa), at a comparable hardness level (682 HV), were significantly lower whencompared to the PM counterpart. This stems from the intrinsic brittleness of the cast material, a consequence ofits complex microstructure, exhibiting pure cleavage-type fracture in several areas of the fracture surface.

Keywords

High–entropy alloys; Microstructure; Mechanical properties; Tribological properties; Powder metallurgy; Casting.

Authors

MORAVČÍKOVA DE ALMEIDA GOUVÊA, L.; MORAVČÍK, I.; OMASTA, M.; VESELY, J.; ČÍŽEK, J.; MINÁRIK, P.; ČUPERA, J.; ZÁDĚRA, A.; JAN, V.; DLOUHÝ, I.

Released

1. 1. 2020

Publisher

Elsevier

Location

ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, USA, NY, 10010-1710

ISBN

1044-5803

Periodical

MATERIALS CHARACTERIZATION

Year of study

159

Number

110046

State

United States of America

Pages from

1

Pages to

16

Pages count

16

URL

https://www.sciencedirect.com/science/article/pii/S1044580319325392

BibTex

@article{BUT160754,
  author="Larissa {Moravčíková de Almeida Gouvea} and Igor {Moravčík} and Milan {Omasta} and Jozef {Vesely} and Jan {Čížek} and Peter {Minárik} and Jan {Čupera} and Antonín {Záděra} and Vít {Jan} and Ivo {Dlouhý}",
  title="High-strength Al0.2Co1.5CrFeNi1.5Ti high-entropy alloy produced by powder metallurgy and casting: A comparison of microstructures, mechanical and tribological properties",
  journal="MATERIALS CHARACTERIZATION",
  year="2020",
  volume="159",
  number="110046",
  pages="1--16",
  doi="10.1016/j.matchar.2019.110046",
  issn="1044-5803",
  url="https://www.sciencedirect.com/science/article/pii/S1044580319325392"
}

Documents

1-s2.0-S1044580319325392-main (2).pdf