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Open AccessArticle

Influence of Ti on the Tensile Properties of the High-Strength Powder Metallurgy High Entropy Alloys

1
Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2896/2, 61669 Brno, Czech Republic
2
Institute of Physics of Materials of the Czech Academy of Sciences, Žižkova 513/22, 61600 Brno, Czech Republic
3
RHP-Technology GmbH, Forschungs- und Technologiezentrum, 2444 Seibersdorf, Austria
*
Author to whom correspondence should be addressed.
Materials 2020, 13(3), 578; https://doi.org/10.3390/ma13030578
Received: 17 December 2019 / Revised: 15 January 2020 / Accepted: 20 January 2020 / Published: 26 January 2020
(This article belongs to the Special Issue Advanced Powder Metallurgy Technologies)
The focus of this study is the evaluation of the influence of Ti concentration on the tensile properties of powder metallurgy high entropy alloys. Three Ni1.5Co1.5CrFeTiX alloys with X = 0.3; 0.5 and 0.7 were produced by mechanical alloying and spark plasma sintering. Additional annealing heat treatment at 1100 °C was utilized to obtain homogenous single-phase face centered cubic (FCC) microstructures, with minor oxide inclusions. The results show that Ti increases the strength of the alloys by increasing the average atomic size misfit i.e., solid solution strengthening. An excellent combination of mechanical properties can be obtained by the proposed method. For instance, annealed Ni1,5Co1,5CrFeTi0.7 alloy possessed the ultimate tensile strength as high as ~1600 MPa at a tensile ductility of ~9%, despite the oxide contamination. The presented results may serve as a guideline for future alloy design of novel, inclusion-tolerant materials for sustainable metallurgy. View Full-Text
Keywords: multi principal element alloy; tensile strength; fracture; ductility; powder multi principal element alloy; tensile strength; fracture; ductility; powder
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Moravcik, I.; Gamanov, S.; Moravcikova-Gouvea, L.; Kovacova, Z.; Kitzmantel, M.; Neubauer, E.; Dlouhy, I. Influence of Ti on the Tensile Properties of the High-Strength Powder Metallurgy High Entropy Alloys. Materials 2020, 13, 578.

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