Publication detail

Influence of Hot Pressing Sintering Temperature on the Properties of Low-Density Al0.5NbTa0.8Ti1.5V0.2Zr Refractory High-Entropy Alloy

MORAVČÍKOVÁ DE ALMEIDA GOUVÊA, L. KOVACOVA, Z. KITZMANTEL, M. NEUBAUER, E. JAN, V. DLOUHÝ, I.

Original Title

Influence of Hot Pressing Sintering Temperature on the Properties of Low-Density Al0.5NbTa0.8Ti1.5V0.2Zr Refractory High-Entropy Alloy

Type

journal article in Scopus

Language

English

Original Abstract

In this work, the low-density Al0.5NbTa0.8Ti1.5V0.2Zr RHEA prepared by mechanical alloying combined with hot uniaxial pressing (HP) was investigated. The alloy was subjected to different sintering temperatures on the range of 1200°C up to 1600°C, while keeping a constant densification time. The influence of the increase in sintering temperatures on the RHEAs’ microstructural features, composition and basic mechanical properties was explored by means of x-ray diffraction and scanning electron microscopy, hardness testing, density determination by Archimedes’ principle and elastic moduli by ultrasonic measurements. Full density samples were obtained in all sintering temperatures. The alloy has shown a homogeneous distribution of phases, with presence of dispersed oxides inside the matrix, leading to a fine grain size distribution due to grain-boundary pinning effect, even during the exposure of the alloy at the highest sintering temperature. The mentioned effect is responsible for the achievement of high-hardness in all conditions. Powder metallurgy has been shown to be an advantageous technique for production of alloys for high-temperature applications, as the inherent in-situ formed oxides homogeneously distributed within the matrix may be beneficially used as reinforcement, thus potentially enhancing the mechanical properties of the parts.

Keywords

complex concentrated alloys; powder metallurgy; intermetallics; microstructure; characterization.

Authors

MORAVČÍKOVÁ DE ALMEIDA GOUVÊA, L.; KOVACOVA, Z.; KITZMANTEL, M.; NEUBAUER, E.; JAN, V.; DLOUHÝ, I.

Released

5. 1. 2021

Publisher

Trans Tech Publications

Location

Switzerland

ISBN

1662-9752

Periodical

Materials Science Forum

Year of study

1016

Number

1016

State

Swiss Confederation

Pages from

940

Pages to

945

Pages count

6

URL

https://www.scientific.net/book/thermec-2021/978-3-0357-3630-4

BibTex

@article{BUT165877,
  author="Larissa {Moravčíková de Almeida Gouvea} and Zuzana {Kovacova} and Michael {Kitzmantel} and Erich {Neubauer} and Vít {Jan} and Ivo {Dlouhý}",
  title="Influence of Hot Pressing Sintering Temperature on the Properties of Low-Density Al0.5NbTa0.8Ti1.5V0.2Zr Refractory High-Entropy Alloy",
  journal="Materials Science Forum",
  year="2021",
  volume="1016",
  number="1016",
  pages="940--945",
  doi="10.4028/www.scientific.net/MSF.1016.940",
  issn="1662-9752",
  url="https://www.scientific.net/book/thermec-2021/978-3-0357-3630-4"
}