Article
Materials Science, Multidisciplinary
Wei Yang, Shu-Jie Pang, Guan Wang, Ying Liu, Peter K. Liaw, Tao Zhang
Summary: Ti-Zr-Hf-Nb-Ta-Sn high-entropy alloys with good mechanical properties, corrosion resistance, and biocompatibility were developed as potential biomaterials. The addition of Sn improved the compressive yield strengths and hardness of the alloys. These alloys also possessed relatively low Young's moduli. The Ti-Zr-Hf-Nb-Ta-Sn alloys with the integration of high yield strength, relatively low Young's modulus, and good corrosion resistance and biocompatibility are promising for biomedical applications.
Article
Chemistry, Physical
Wei Yang, Shujie Pang, Ying Liu, Qing Wang, Peter K. Liaw, Tao Zhang
Summary: Novel high-entropy alloys (HEAs) with excellent mechanical properties and biocompatibility have been designed and synthesized for biomedical applications, demonstrating great potential in the field.
Article
Materials Science, Ceramics
Yichen Wang, Duo Yu, Jie Yin, Buhao Zhang, Hangfeng Zhang, Xuejian Liu, Yulong An, Michael J. Reece, Zhengren Huang
Summary: The ablation behavior of HEC-0 and the effect of SiC content on ablation resistance were investigated. The results showed that the complex oxide layer played a positive role in reducing the linear ablation rate of HEC-0. The addition of SiC significantly improved the ablation resistance of the composites.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Mitja Krnel, Andreja Jelen, Stanislav Vrtnik, Joze Luzar, Darja Gacnik, Primoz Kozelj, Magdalena Wencka, Anton Meden, Qiang Hu, Sheng Guo, Janez Dolinsek
Summary: In this study, the scandium-containing Sc-Hf-Nb-Ta-Ti-Zr system of refractory HEAs was investigated. The addition of scandium produced a two-phase structure, with one phase being bcc and the other hcp. Superconductivity was found to originate from the bcc phase, while the hcp phase was non-superconducting. The microstructure of the alloys became very inhomogeneous due to the addition of scandium.
Article
Materials Science, Multidisciplinary
Yuuka Iijima, Takeshi Nagase, Aira Matsugaki, Pan Wang, Kei Ameyama, Takayoshi Nakano
Summary: By applying empirical alloy parameters and thermodynamic calculations, new noble nonequiatomic Ti-Zr-Hf-Nb-Ta-Mo high-entropy alloys for metallic biomaterials were designed. The Mo equivalent and valence electron concentration parameters were found to be useful for alloy design, including BCC structure formation in bio medium-entropy alloys and BioHEAs.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Yichen Wang, Xincheng Wang, Suwei Li, Michael J. Reece
Summary: The oxidation behavior of high entropy carbonitrides is investigated for the first time, revealing that the oxidation onset temperature increases with nitrogen content. The high entropy carbonitrides showcase better structural stability compared to monocarbides and mononitrides.
Article
Chemistry, Physical
E. Panina, N. Yurchenko, S. Zherebtsov, N. Stepanov
Summary: The response of Ti40Nb30Hf15Al15 and Ti40Nb30Zr20Al10 refractory high entropy alloys to annealing was investigated in this study. Different grain sizes and phase compositions were observed after cold rolling and annealing at different temperatures, leading to varying degrees of hardness changes in the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Shashank Mishra, Soumyadipta Maiti, Beena Rai
Summary: Refractory high entropy alloys (R-HEAs) have gained prominence for their high strength and hardness properties in various applications. This study computationally investigates the properties of TaNbHfZr R-HEA, focusing on the role of nanostructure evolution, dislocation simulations, and the ductile to brittle transition behavior. The findings provide insights into the relationship between mechanical properties and local nanostructure, with implications for materials design and development.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Wenna Jiao, Junwei Miao, Yiping Lu, Xiaohu Chen, Zheng Ren, Guomao Yin, Tingju Li
Summary: Recently, a modified simple mixture method was proposed to design eutectic high-entropy alloys (EHEAs) containing more than five elements. Four novel six-element and seven-element EHEAs were designed and prepared, demonstrating the validity and accuracy of this method. The two seven-element EHEAs exhibited peak strengths of 592 and 660 MPa at 1073 K, surpassing most reported EHEAs and even some refractory high-entropy alloys (RHEAs). This study provides a significant paradigm for designing EHEAs with more than five elements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Rajeshwar R. Eleti, Nikita Stepanov, Nikita Yurchenko, Denis Klimenko, Sergey Zherebtsov
Summary: Investigated the plastic deformation and rate-controlling mechanism during tensile deformation of various body-centered cubic (BCC) medium/high-entropy alloys (MEAs/HEAs) at 300 K, revealing screw dislocation motion overcoming the Peierls-Nabarro stress barrier as the rate-controlling mechanism, with the activation volume (V*) found inversely proportional to the yield strength.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
Annamaria Naughton-Duszova, David Medved, Lenka Dakova, Alexandra Kovalcikova, Peter Svec, Peter Tatarko, Hakan Unsal, Pavol Hvizdos, Pavol Sajgalik, Jan Dusza
Summary: The wear characteristics of a fine-grained dual-phase high-entropy (Ti0.14Zr0.2Nb0.2Hf0.2Ta0.26)C + (Ti0.38Zr0.18Nb0.22Hf0.115Ta0.105)B-2 were studied using the ball-on-flat technique in air. The material had high density, small grain size, and high hardness. The friction coefficient increased with sliding distance, and the specific wear rate decreased with increasing sliding distance. The dominant wear mechanisms were oxidation-driven tribo-chemical reaction and tribo-layer formation in boride grains, as well as mechanical wear in carbide grains.
ADVANCES IN APPLIED CERAMICS
(2023)
Article
Materials Science, Multidisciplinary
Dalibor Preisler, Tomas Krajanak, Milos Janecek, Jiri Kozlik, Josef Strasky, Michal Brazda, Jan Dzugan
Summary: Bulk Nb-Ta-Ti-Zr refractory complex concentrated alloy (RCCA) was prepared using the additive manufacturing method of directed energy deposition (DED) from an equiatomic mixture of elemental powders. Scanning velocity was varied to investigate the effect of different heat inputs, and it was found that decreasing scanning velocity effectively reduced the number of undissolved Nb/Ta particles in the microstructure. Preheating the platform to 500 degrees C during deposition resulted in the best microstructure homogeneity. Homogenization annealing at 1400 degrees C/24 h was performed, but complete Ta particles dissolution was not achieved. Optimization of deposition parameters is crucial for achieving reasonable microstructure homogeneity in RCCA produced from elemental powders, as homogenization annealing cannot eliminate heterogeneities at the scale of powder particles size.
Article
Chemistry, Inorganic & Nuclear
Pavlina Solcova, Matej Niznansky, Jiri Schulz, Petr Brazda, Petra Ecorchard, Monika Vilemova, Vaclav Tyrpekl
Summary: High-entropy ceramics, represented by metal carbides of Ti, Zr, Hf, Ta, and Nb, are materials with great potential and wide applications. A chemical route to synthesize high-entropy carbide powder at a lower temperature has been developed, allowing for ideal mixing of precursors on a molecular level without the need for milling and blending steps. The resulting phase-pure high-entropy carbide was characterized through solid-state analysis.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Yihan Wu, Wenshan Yu, Shengping Shen
Summary: In this paper, a supervised machine learning framework powered by the distributed breeder genetic algorithm (DBGA) is proposed to train a charge transfer ionic potential (CTIP) for the multi-component Hf/Nb/Ta/Ti/Zr/O system. The developed potential is rigorously validated and used to study the atomic structure and its evolution in RHEA. The simulation results provide valuable atomistic information and display promising prospects for large-scale reactive simulations.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Yongkang Zhou, Shuai Zeng, Yuhui Zhu, Bowen Zhao, Huan Li, Hongwei Zhang, Haifeng Zhang, Zhengwang Zhu
Summary: Refractory complex concentrated alloys (RCCAs) have gained significant attention due to their unique design concept and mechanical properties at elevated temperatures. This study evaluates the phase stability of a single-phase body-centered cubic (BCC) Zr46Ti13Nb26Ta10.5Sn4.5 alloy and examines the influence of phase decomposition on high-temperature mechanical properties. The findings suggest that optimizing the microstructure by tuning the phase stability can enhance the high-temperature mechanical properties of RCCAs, providing insight for designing high-performance RCCAs.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Suryanaman Chaube, Shashank Mishra, Soumyadipta Maiti, Beena Rai
MOLECULAR SIMULATION
(2019)
Article
Metallurgy & Metallurgical Engineering
Deepak Jain, Balarama Sridhar Dwadasi, Dharmendr Kumar, Shashank Mishra, Bharath Ravikumar, Rakesh Gupta, Sriram Goverapet Srinivasan, Vinay Jain, Mahesh Mynam, Soumyadipta Maiti, Beena Rai
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2019)
Article
Multidisciplinary Sciences
Shashank Mishra, Soumyadipta Maiti, Beena Rai
Summary: Refractory high entropy alloys (R-HEAs) have gained prominence for their high strength and hardness properties in various applications. This study computationally investigates the properties of TaNbHfZr R-HEA, focusing on the role of nanostructure evolution, dislocation simulations, and the ductile to brittle transition behavior. The findings provide insights into the relationship between mechanical properties and local nanostructure, with implications for materials design and development.
SCIENTIFIC REPORTS
(2021)
Proceedings Paper
Engineering, Manufacturing
Shashank Mishra, Mahdieh Shojaei Baghini, Dhayalan Shakthivel, Beena Rai, Ravinder Dahiya
Summary: In this study, soft capacitive pressure sensors based on elastomeric dielectric materials and piezoelectric nanowires were simulated using finite element methods. The effects of piezoelectric properties of the nanowires on the sensitivity of the sensors were investigated, and it was found that the sensors showed higher sensitivity when the nanowires were incorporated. This study demonstrates the potential for using finite element methods in optimizing sensor design.
2022 IEEE INTERNATIONAL CONFERENCE ON FLEXIBLE AND PRINTABLE SENSORS AND SYSTEMS (IEEE FLEPS 2022)
(2022)
Article
Automation & Control Systems
Yogeenth Kumaresan, Shashank Mishra, Oliver Ozioko, Radu Chirila, Ravinder Dahiya
Summary: This paper presents stretchable strain sensors capable of operating over multi-strain range and having an excellent gauge factor. The study reveals that the sensors exhibit excellent stretchability when only filler particles are present in the elastomer, and they exhibit high sensitivity when filler particles are mixed with graphene-carbon paste (GCP). Molecular dynamics simulations show that the addition of GCP to the elastomer-filler composite helps to attain an excellent sensor response with wide-range stretchability.
ADVANCED INTELLIGENT SYSTEMS
(2022)
Article
Chemistry, Physical
Chinmay Dahale, Sriram Goverapet Srinivasan, Shashank Mishra, Soumyadipta Maiti, Beena Rai
Summary: This study investigates surface segregation in high entropy alloys (HEAs) using Monte Carlo-Molecular Dynamics simulations. The results reveal that Ag atoms preferentially segregate to the surface in the equimolar AgAuCuPdPt HEA, while Au atoms mainly exist in the subsurface layer. Pt atoms are not found on the surface layer in all systems. Furthermore, the analysis of each surface site shows that a finite number of chemically unique clusters are formed, which play a significant role in catalytic activity.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2022)