Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility

Date

2022-11-01

Author

Iroc, L.K.
Tukac, O.U.
Tanrisevdi, B.B.
El-Atwani, O.
Tunes, M.A.
Kalay, Yunus Eren
Aydoğan Güngör, Eda

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

129
views

0
downloads

© 2022Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening at high temperatures. In this study, we show that oxygen-doping can be used as a new alloy design strategy for tailoring the mechanical behavior of the TiZrHfNbTa alloy: a novel low-density (7.98 g/cm3) ductile RHEA. Even though the material is a single-phase BCC with some oxides at room temperature, secondary BCC and HCP nano-lamellar structures start to form above 600 °C in addition to the nano-twins which are shown to be stable up to 1000 °C. This alloy shows superior strength and compressive ductility due to the nanoengineered microstructure. The present study sheds light on tailoring the strength-ductility balance in RHEAs by controlling the microstructure of novel RHEAs at the nanoscale via oxygen-doping.

Subject Keywords

CALPHAD, In-situ TEM, Nano-lamellar structures, Nanotwins, Refractory High Entropy Alloys (RHEAs)

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85139850041&origin=inward
https://hdl.handle.net/11511/100239

Journal

Materials and Design

DOI

https://doi.org/10.1016/j.matdes.2022.111239

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

Development and thermal stability of Cr10Mo25Ta25Ti15V25 refractory high entropy alloys Tukac, O. Umut; Özalp, Ali; Aydoğan Güngör, Eda (2023-01-01) Refractory high entropy alloys (RHEAs) are promising materials for extreme environment applications, such as high-temperatures (> 1000 degrees C), corrosion and irradiation. In this study, a new CrMoTaTiV RHEA system has been designed using CALPHAD modeling and thermophysical parameter optimization, and produced by vacuum arc melting. Microstructure at room temperature as well as microstructural stability and me-chanical properties at high temperature have been investigated. It has been found that BCC alloy...
Design and development of iron aluminium intermetallic compounds for structural applications at high temperatures Yıldırım, Mehmet; Akdeniz, Mahmut Vedat; Mekhrabov, Amdulla O.; Department of Metallurgical and Materials Engineering (2014) Fe-Al based intermetallic compounds are considered as suitable candidates for structural applications at high temperatures due to their outstanding oxidation and corrosion resistance, good intermediate temperature strength, low density, low cost and relatively high melting point. These outstanding physical and mechanical properties are mainly attributed to their long-range ordered superlattices, deviation from stochiometry and ternary alloying additions. However, poor ductility at ambient temperatures signi...
Fabrication of SiO2-stacked diamond membranes and their characteristics for microelectromechanical applications Bayram, Barış (Elsevier BV, 2011-04-01) Diamond is a promising microelectromechanical systems (MEMS) material due to its high Young's Modulus and very large thermal conductivity. In this work, ultrananocrystalline diamond was stacked between silicon dioxide to form thermally-stable and robust membranes. These SiO2-stacked diamond layers were processed into MEMS-compatible membranes. For comparison, membranes composed of only SiO2 were fabricated as well. The structural characteristics of these membranes are compared and analyzed for membranes of ...
Investigation of structural and electronic properties of ZnCdTe ternary alloy nanostructures Kurban, Mustafa; Erkoç, Şakir; Department of Physics (2016) Nanostructures, including II-VI compound semiconductors, have attracted enormous attention in a wide range of applications of nanotechnology due to the unusual mechanical, electrical and thermal properties under varying size, geometry, temperature and pressure when compared to corresponding bulk materials. However, these properties are not directly measurable by experiments because of the methods or the availability of the experimental tools, so theoretical models and computations play an important role in ...
Epoxy-based composites and coatings: improvement of multifunctional properties Çaldıklıoğlu, Almira; Bayram, Göknur; Department of Chemical Engineering (2019) The purposes of this study are to improve mechanical properties, thermal stability, resistance to flammability, electrical conductivity and hydrophobicity of epoxy (E) by incorporation of expanded graphite (EG) and titanium dioxide (T) particles. In this study, sonication with the use of solvent method was primarily determined for the epoxy-based binary composite and coating preparation. By this method, the epoxy composites and coatings were produced by changing EG concentration as 0.05, 0.1, 0.25, 0.5, 0.7...

Citation Formats

L. K. Iroc et al., “Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility,” Materials and Design, vol. 223, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85139850041&origin=inward.