Publication detail

Effect of heat treatment on microstructure and mechanical properties of spark plasma sintered AlCoCrFeNiTi0.5 high entropy alloy

MORAVČÍK, I. ČÍŽEK, J. GAVENDOVÁ, P. SHEIKH, S. GUO, S. DLOUHÝ, I.

Czech title

Vliv tepelného zpracování na mikrostruktury a mechanických vlastnosti slinuté AlCoCrFeNiTi0.5 vysoko entropické slitiny

English title

Effect of heat treatment on microstructure and mechanical properties of spark plasma sintered AlCoCrFeNiTi0.5 high entropy alloy

Type

journal article in Web of Science

Language

en

Original abstract

The present work is focused on synthesis and heat treatment on non-equiatomic AlCoCrFeNiTi0.5 high entropy alloy (HEA) with a composite structure reinforced by TiC nanoparticles. The initial alloy was prepared by mechanical alloying (MA) in a planetary ball mill, compacted by spark plasma sintering (SPS) and heat treated at different temperatures. Mechano-chemical reactions during the MA process as well as the microstructure and hardness of the SPS-ed compacts prior to and after the heat treatment were investigated. During MA, Cr-based supersaturated solid solution with the BCC structure was formed. After SPS at 1100 °C, the BCC solid solution decomposed into nano-grained microstructure consisting of FCC and ordered BCC solid solutions, σ phase, and in-situ formed TiC nanoparticles. The high hardness of the alloy (762 HV) was retained after the subsequent heat treatment at 1100 °C (603 HV). It was shown that the fabrication of TiC reinforced nanocomposites from elemental powders without the use of expensive nanograined powders can be achieved.

Czech abstract

Práce je zaměřena na syntézu a tepelného zpracování ne-equiatomické alitiny AlCoCrFeNiTi0.5 TiC nanočásticemi. Prvotní slitina byla připravena mechanickým legováním (MA) v planetární kulový mlýn, kompaktované SPS a tepelně spracované pri různých teplotách. Mechanicko chemická reakce během procesu MA i mikrostruktury a tvrdost SPS-ed kompakty před i po tepelném zpracování byly šetřeny. Během MA vznikol Cr přesycený tuhý roztok s BCC strukturou. Po SPS 1100°C vznikla mikrostruktura skládající se z FCC tuhého roztoku TiC nanočástic. Vysoká tvrdost slitiny (762 HV) byl zachován po následné tepelné zpracování při 1100°C (603 HV).

English abstract

The present work is focused on synthesis and heat treatment on non-equiatomic AlCoCrFeNiTi0.5 high entropy alloy (HEA) with a composite structure reinforced by TiC nanoparticles. The initial alloy was prepared by mechanical alloying (MA) in a planetary ball mill, compacted by spark plasma sintering (SPS) and heat treated at different temperatures. Mechano-chemical reactions during the MA process as well as the microstructure and hardness of the SPS-ed compacts prior to and after the heat treatment were investigated. During MA, Cr-based supersaturated solid solution with the BCC structure was formed. After SPS at 1100 °C, the BCC solid solution decomposed into nano-grained microstructure consisting of FCC and ordered BCC solid solutions, σ phase, and in-situ formed TiC nanoparticles. The high hardness of the alloy (762 HV) was retained after the subsequent heat treatment at 1100 °C (603 HV). It was shown that the fabrication of TiC reinforced nanocomposites from elemental powders without the use of expensive nanograined powders can be achieved.

Keywords in Czech

Kompozity; slitiny s vysokou entropií ; SPS

Keywords in English

Composites; Multi-principal-element alloys alloy; SPS

Released

17.03.2016

Publisher

ELSEVIER

Location

USA

ISSN

0167-577X

Volume

174

Number

1

Pages from–to

53–56

Pages count

4

BIBTEX


@article{BUT123733,
  author="Igor {Moravčík} and Jan {Čížek} and Petra {Krajňáková} and Saad {Sheikh} and Sheng {Guo} and Ivo {Dlouhý},
  title="Effect of heat treatment on microstructure and mechanical properties of spark plasma sintered AlCoCrFeNiTi0.5 high entropy alloy",
  year="2016",
  volume="174",
  number="1",
  month="March",
  pages="53--56",
  publisher="ELSEVIER",
  address="USA",
  issn="0167-577X"
}