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

0524220 - ÚFM 2021 RIV CH eng J - Journal Article
Moravčík, I. - Gamanov, Štěpán - Moravcikova-Gouvea, L. - Kováčová, Z. - Kitzmantel, M. - Neubauer, E. - Dlouhý, Ivo
Influence of Ti on the Tensile Properties of the High-Strength Powder Metallurgy High Entropy Alloys.
Materials. Roč. 13, č. 3 (2020), č. článku 578. E-ISSN 1996-1944
Institutional support: RVO:68081723
Keywords : solid-solution * mechanical-properties * microstructure * prediction * behavior * elements * phase * oxide * multi principal element alloy * tensile strength * fracture * ductility * powder
OECD category: Materials engineering
Impact factor: 3.623, year: 2020
Method of publishing: Open access
https://www.mdpi.com/1996-1944/13/3/578

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 degrees 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 similar to 1600 MPa at a tensile ductility of similar to 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.
Permanent Link: http://hdl.handle.net/11104/0308600