Mechanical properties and thermal stability of (NbTiAlSiZr)Nx high-entropy ceramic films at high temperatures

2018 ◽  
Vol 33 (19) ◽  
pp. 3347-3354 ◽  
Author(s):  
Qiu-Wei Xing ◽  
Song-Qin Xia ◽  
Xue-Hui Yan ◽  
Yong Zhang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
High Temperatures ◽  
High Entropy ◽  
Ceramic Films ◽  
Image Position ◽  
Thermal Stability Of

Abstract

scholarly journals Thermal Stability of MoNbTaVW High Entropy Alloy Thin Films

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 941
Author(s):  
Ao Xia ◽  
Robert Franz
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Thermal Stability ◽  
Solid Solution ◽  
Electrical Conductivity ◽  
High Entropy Alloy ◽  
Solid Solution Phase ◽  
Body Centered Cubic ◽  
High Entropy ◽  
Thermal Stability Of

Refractory high entropy alloys are an interesting material class because of their high thermal stability, decent electrical conductivity, and promising mechanical properties at elevated temperature. In the present work, we report on the thermal stability of body-centered cubic MoNbTaVW solid solution thin films that were synthesized by cathodic arc deposition. After vacuum annealing up to 1600 °C, the morphology, chemical composition, crystal structure, and electrical conductivity, as well as the mechanical properties, were analyzed. The observed body-centered cubic MoNbTaVW solid solution phase is stable up to 1500 °C. The evolution of electrical and mechanical properties due to the annealing treatment is discussed based on the observed structural changes of the synthesized thin films.

Alloying behavior and thermal stability of mechanically alloyed nano AlCoCrFeNiTi high-entropy alloy

2019 ◽  
Vol 34 (5) ◽  
pp. 787-795 ◽  
Author(s):  
Vikas Shivam ◽  
Yagnesh Shadangi ◽  
Joysurya Basu ◽  
Nilay Krishna Mukhopadhyay
Keyword(s):  
Thermal Stability ◽  
High Entropy Alloy ◽  
Mechanically Alloyed ◽  
High Entropy ◽  
Image Position ◽  
Thermal Stability Of

Abstract

Influence of processing route on the alloying behavior, microstructural evolution and thermal stability of CrMoNbTiW refractory high-entropy alloy

2020 ◽  
Vol 35 (12) ◽  
pp. 1556-1571
Author(s):  
Lavanya Raman ◽  
G. Karthick ◽  
K. Guruvidyathri ◽  
Daniel Fabijanic ◽  
S. V. S. Narayana Murty ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Microstructural Evolution ◽  
Processing Route ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Image Position ◽  
Thermal Stability Of

Abstract

scholarly journals Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2903
Author(s):  
Juvenal Giogetti Nemaleu Deutou ◽  
Rodrigue Cyriaque Kaze ◽  
Elie Kamseu ◽  
Vincenzo M. Sglavo
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
High Strength ◽  
Treatment Temperature ◽  
Strength Development ◽  
Particle Sizes ◽  
Cold Setting ◽  
Thermal Stability Of ◽  
Geopolymer Composites ◽  
Refractory Composites

The present project investigated the thermal stability of cold-setting refractory composites under high-temperature cycles. The proposed route dealt with the feasibility of using fillers with different particle sizes and studying their influence on the thermo-mechanical properties of refractory geopolymer composites. The volumetric shrinkage was studied with respect to particle sizes of fillers (80, 200 and 500 µm), treatment temperature (1050–1250 °C) and amount of fillers (70–85 wt.%). The results, combined with thermal analysis, indicated the efficiency of refractory-based kyanite aggregates for enhancing thermo-mechanical properties. At low temperatures, larger amounts of kyanite aggregates promoted mechanical strength development. Flexural strengths of 45, 42 and 40 MPa were obtained for geopolymer samples, respectively, at 1200 °C, made with filler particles sieved at 80, 200 and 500 µm. In addition, a sintering temperature equal to 1200 °C appeared beneficial for the promotion of densification as well as bonding between kyanite aggregates and the matrix, contributing to the reinforcement of the refractory geopolymer composites without any sign of vitrification. From the obtained properties of thermal stability, good densification and high strength, kyanite aggregates are efficient and promising candidates for the production of environmentally friendly, castable refractory composites.

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