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ABSTRACT
This work, a new composition of high-entropy alloys (HEAs) was designed. The composition was carefully tailored with the aim to obtain a solid solution with a BCC crystalline structure to be an alternative binder in cermets. Thus, the composition of the HEA has been designed taking into account various criteria which has fulfilled a metallic binder of a Ti(C,N) cermet:(1) high hardness and oxidation resistance and (2) good wetting behaviour with Ti(C,N) particles because the processing of cermets is by LPS. The design of the alloy has been performed using theoretical calculations of physicochemical properties of the elements involved and the calculation of phase diagram by Thermocalc. The designed alloy has been processed by casting and powder metallurgy (PM) to study the influence of the processing route on the phases formed and on the resulting properties. The powders were produced by gas atomisation and then consolidated by hot pressing.
Special theme block on high entropy alloys, guest edited by Paula Alvaredo Olmos, Universidad Carlos III de Madrid, Spain, and Sheng Guo, Chalmers University, Gothenburg, Sweden.
Acknowledgement
E. Prieto acknowledges IAAB who financed the stay in Vienna.
Disclosure statement
No potential conflict of interest was reported by the authors.
Notes on contributors
Estela Prieto completed her studies of Master’s Degree in Materials Science and Engineering in 2015. Nowadays she works as research assistant and PhD student at the Group of Powder Technology “of the University Carlos III of Madrid, Spain, and Teaching Assistant”. Her research areas are mainly focused on “Development of high entropy alloys by powder metallurgy and metal matrix alternative cermets”.
Dr. Raquel de Oro Calderon is Senior Scientist at the Technical University of Vienna (Austria). She obtained her PhD Degree in Materials Science and Engineering in 2012 at University Carlos III in Madrid (Spain), under the frame of the IV Höganäs Chair in Powder Metallurgy. After her PhD she worked as a post-doctoral researcher at Chalmers University of Technology in Gothenburg (Sweden), and afterwards as Marie Curie Fellow at TU Wien. Her main areas of research are related to alloying design and to the optimization of sintering in PM materials, with particular focus on liquid phase design and evaluation.
Dr. Thomas Konegger obtained his PhD thesis: “Polysilazane-derived ceramics with oxide ceramic fillers”, (2010) from Institute of Chemical Technologies and Analytics, TU Wien, Austria. He is post-doctoral researcher of TU Wien, Austria in Institute of Chemical Technologies and analytics and Head of Research Group “High-performance ceramics”. His research is mainly focused in polymer-derived ceramics, porous ceramics, materials characterization and mechanical testing.
Dr. Christian Gierl-Mayer is Assistant Professor for Metallic Sintered Materials at Technische Universität Wien (Vienna University of Technology), Vienna, Austria. He got his PhD in Technical Chemistry in 2000 for his Dissertation “Manufacturing of PM-Parts by Optimized Sintering”, which was awarded the MIBA Award 2000 for Promotion of Technical Sciences. He has been active in the field of Powder Metallurgy for more than 10 years, is author of more than 100 publications in journals, conference proceeding and book chapters. His main research topics are the sintering behavior of PM-materials and the thermal analysis of the sintering process. He is author of 5 patents; chairman of the expert group “Sintering” of “Gemeinschaftsausschuss Pulvermetallurgie” (the Powder Metallurgy association of the German-speaking countries) and was Head of Program Committee of the 31st Hagener Symposium Pulvermetallurgie. Since 2016 he is coordinator of the EPMA Powder Metallurgy Summer School where he also participates as teacher being in charge of the topic “Atmosphere/Material Interaction”.
Saad Sheikh is currently studying the alloy development and determination of mechanical property of High-Entropy alloys (HEAs), as a PhD student, at the Department of Industrial and Materials Science, Chalmers University of Technology, Sweden. His research interests are focused on the development of novel refractory alloys for high temperature applications.
Dr. Elena Gordo, is PhD in Mining Engineering (1998) from Technical University of Madrid, Spain. She is full professor of the Department of Materials Science and Engineering of the University Carlos III of Madrid, Spain, and Head of the Group of Powder Technology of this university. Her research is mainly focused in the design and processing of titanium alloys and hardmetals by powder metallurgy.
Dr. Sheng Guo is currently an Associate Professor at the Department of Materials and Manufacturing Technology, Chalmers University of Technology. Sheng joined Chalmers as an Assistant Professor in 2013. His main research areas are the alloy design and physical metallurgy of concentrated multi-component alloys, better known as high-entropy alloys (HEAs). HEAs have great potential to be used as high-temperature materials, and in environments where high hardness, high wear resistance, and high corrosion resistance are required. Sheng’s research interest also goes to other advanced metallic materials, like metallic glasses or amorphous alloys.
Dr. Herbert Danninger is Full Professor for Chemical Technology of Inorganic Materials at Technische Universität Wien (Vienna University of Technology), Vienna, Austria, and currently Dean of the Faculty of Technical Chemistry. He has been active in powder metallurgy for more than 35 years and is author of more than 400 publications on powder metallurgy topics as well as several books and book chapters. He has worked mainly on high strength and high density sintered steels, with particular focus on sintering, microstructural characterization and high cycle fatigue. He served as co-chairman of the Powder Metallurgy World Congress 2004 in Vienna, Austria. Currently he is chairman of the “Gemeinschaftsausschuss Pulvermetallurgie”, the PM association of the German-speaking countries. Herbert Danninger received the “Skaupy lecture” award of the “Gemeinschaftsausschuss Pulvermetallurgie” in 2006 and was elected Fellow of APMI in 2010. He holds honorary doctoral degrees of Technical University Cluj-Napoca (Romania), of Universidad Carlos III de Madrid (Spain) and of University of Craiova (Romania).
Dr. Srdjan Milenkovic graduated with a BSc degree in Metallurgy from Belgrade University, Serbia in 1995. He received his MSc and PhD degrees in Materials Engineering in 1998 and 2002, respectively, from the State University of Campinas (UNICAMP), Brazil. He currently leads the research group of Solidification and Casting of Advanced High Temperature Materials.
Dr. Paula Alvaredo obtained her PhD in Materials Science and Engineering at (UC3M) with the work entitled New cermet materials with Fe matrix: Study of composition, microstructure and properties in 2012. Nowadays she works as Assistant Professor in Powder Metallurgy research group at UC3M. Her research areas are mainly focused on Alternative Binders in cermets and High Entropy Alloys by PM.