Article
Materials Science, Multidisciplinary
Panos Tsakiropoulos
Summary: This paper discusses the importance of choosing and typology of the alloyed refractory metal silicide Nb5Si3 for achieving a balance of properties and meeting property goals in metallic ultra-high temperature materials. Different types of alloyed Nb5Si3, including conventional, complex concentrated, and high entropy silicides, in metallic UHTMs with Nb and Si addition were studied to support the design and development of metallic UHTMs.
Article
Materials Science, Ceramics
V Jacobson, D. Diercks, B. To, A. Zakutayev, G. Brennecka
Summary: Entropy stabilization is a new approach to designing novel materials. Research has shown that substrate temperature and deposition pressure have strong effects on the properties of thin films. Films deposited at lower temperatures and pressures have lower electrical resistivity and can be altered through annealing in an oxygen-rich environment.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Xuhui Pei, Yin Du, Tao Li, Hanming Wang, Mingchuan Hu, Haifeng Wang
Summary: TiZrV0.5Nb0.5Six (x = 0.1, 0.2, 0.3) refractory high entropy alloys were used to evaluate the relationship between microstructure, mechanical properties, and elevated temperature service performance. Increasing Si addition resulted in a transition from single-phase BCC to dual-phase BCC and silicide, accompanied by increased micro-hardness/strength and improved wear and oxidation resistance. The formation of a strong silicide phase inhibited oxide layer cracking and volatilization, leading to excellent oxidation resistance. Improved wear resistance was attributed to enhanced micro-hardness and formation of a dense glaze layer at elevated temperatures. These findings provide insights into designing refractory high entropy alloys for harsh environments.
MATERIALS CHARACTERIZATION
(2023)
Review
Materials Science, Ceramics
Ashritha Salian, Pradyut Sengupta, Iteesha Vishalakshi Aswath, Avinash Gowda, Saumen Mandal
Summary: Metal silicides and silicates are silicon-based ceramics with exceptional properties. The introduction of high entropy in these materials has created new avenues for materials discovery and design. High entropy silicides and silicates exhibit improved properties and show promise in various applications, such as microelectronics and high-temperature coatings.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Chemistry, Physical
Xianghan Xu, Fei-Ting Huang, Yubo Qi, Sobhit Singh, Karin M. Rabe, Dimuthu Obeysekera, Junjie Yang, Ming-Wen Chu, Sang-Wook Cheong
Summary: The study demonstrates that stabilization of the desired phase in bulk hafnium dioxide is achieved through yttrium doping and rapid cooling, greatly expanding the application of hafnium dioxide's ferroelectric properties.
Article
Multidisciplinary Sciences
Stephan Appelfeller
Summary: The study investigates the self-organized formation of single domain Au silicide nanowires on Si(110), analyzing their growth and properties using STM, PES, and STS techniques. The formation conditions and structural characteristics of the Au silicide nanowires are identified, with widths of about 2 to 3 nm and heights below 1 nm when grown at appropriate annealing temperatures.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Sashank Shivakumar, Mingde Qin, Dawei Zhang, Chongze Hu, Qizhang Yan, Jian Luo
Summary: A new type of compositionally complex silicides has been synthesized, demonstrating stable hexagonal gamma phase and cation ordering. This work expands the field of high entropy ceramics and shows potential for high-entropy counterparts to Nb-silicide and Mo-Si-B composites.
SCRIPTA MATERIALIA
(2022)
Review
Chemistry, Physical
Panos Tsakiropoulos
Summary: This paper discusses the usefulness of the alloy design methodology NICE for the development of new Nb-containing metallic ultra-high-temperature materials, analyzes the alloy behavior and properties of different phases, and demonstrates the practicality of parameter maps for describing alloy behavior and properties.
Review
Materials Science, Multidisciplinary
Ashritha Salian, Saumen Mandal
Summary: High-entropy oxides (HEOs) have captured significant scientific attention for their exceptional and tunable properties, with the main driving force being the control of configurational entropy to achieve phase purity. These new oxide candidates show great potential for practical applications and represent a key frontier for researchers to explore.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2022)
Article
Physics, Multidisciplinary
Changwon Kim
Summary: This study introduces a new single-image dehazing method that combines dark channel prior and bright channel prior to overcome the limitations of dark channel prior. It proposes a patch-based robust atmospheric light estimation and region adaptive haze control parameters for improving image dehazing. The method outperforms the state-of-the-art image dehazing method both visually and numerically according to the evaluation of synthetic and real data sets.
Article
Chemistry, Physical
Ashritha Salian, K. Akshay Prasad, Saumen Mandal
Summary: High entropy oxide (HEO) (Ce0.2La0.2Pr0.2Sm0.2Y0.2)O1.6-δ with phase pure fluorite structure was synthesized using low-temperature solution combustion. The HEO formation at 500℃ was due to the exothermicity of the combustion redox reaction. The presence of different secondary phases and the role of configurational entropy in phase stabilization were observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Alexander D. Dupuy, I-Ting Chiu, Padraic Shafer, Elke Arenholz, Yayoi Takamura, Julie M. Schoenung
Summary: Entropy-stabilized oxides exhibit reversible entropy-driven phase transformations, allowing for property optimization and novel functionalities through the adjustment of electronic structures. The transition of Cu, Co, and Zn ions from six-fold to four-fold coordination structures in the entropy-stabilized phase is influenced by the segregation of Cu-rich tenorite phase and Co-rich spinel phase.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Jiabei He, Zhenbao Li, Yue Liu
Summary: The study on multicomponent complex high entropy oxides (HEOs) synthesized using quaternary mixture containing different binary oxides revealed that the lattice structure and thermal conductivities of (Zr0.25Hf0.25Ti0.25Sn0.25)O-2 ceramics varied under different temperatures due to reversible transformation characteristics of HEO, leading to changes in lattice distortion.
Article
Materials Science, Multidisciplinary
Laiqi Zhang, Huicong Li, Zepeng Xiao
Summary: The phase formation ability of MSi2-type HERMS was systematically studied, and criteria for predicting phase formation were proposed. The accuracy of the criteria was verified, highlighting their significance for composition design and further research of HERMS.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Xuelian Wang, Xuekai Zhang, Peng Tong, Cheng Yang, Jianguo Si, Tingjiao Xiong, Buke Dong, Lulu Xie, Chengbing Pan, Meng Wang, Jianchao Lin, Huaican Chen, Wen Yin, Wenhai Song, Yuping Sun
Summary: Large amounts of heat are needed in industries such as food processing and textiles to maintain equipment in the medium-temperature range of 393-573 K. However, there are few thermal storage materials that work at this temperature. Hexagonal iron sulfide FeS undergoes a solid-state phase transition at 420 K with a high entropy change. A secondary hexagonal phase with Fe deficiency is formed when FeS is annealed at slightly higher temperatures. The thermally stabilized FeS sample exhibits a high thermal storage density, making it a potential candidate for solid-state phase transition latent heat energy storage in the medium-temperature region.
SCRIPTA MATERIALIA
(2023)
Article
Multidisciplinary Sciences
Hyun Seok Oh, Sang Jun Kim, Khorgolkhuu Odbadrakh, Wook Ha Ryu, Kook Noh Yoon, Sai Mu, Fritz Koermann, Yuji Ikeda, Cemal Cem Tasan, Dierk Raabe, Takeshi Egami, Eun Soo Park
NATURE COMMUNICATIONS
(2019)
Article
Chemistry, Physical
Je In Lee, Wook Ha Ryu, Kook Noh Yoon, Eun Soo Park
Summary: By systematically designing Mg-based bulk metallic glass matrix composites containing primary alpha-Mg phases, the developed materials exhibit significantly higher compressive fracture strength and specific strength compared to commercial Mg alloys. The presence of dispersed primary alpha-Mg phases in the composite materials inhibits rapid shear band propagation and promotes the formation of multiple shear bands, leading to enhanced plasticity and work hardening. These results suggest a promising strategy for fabricating Mg-based BMGMCs with high specific strength and enhanced plasticity for lightweight structural applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jing Zhang, Kook Noh Yoon, Min Seok Kim, Heh Sang Ahn, Ji Young Kim, Wook Ha Ryu, Eun Soo Park
Summary: Nitrogen doping has a significant impact on the microstructure and mechanical properties of high-entropy alloys. The complex heterogeneous microstructure can greatly improve the yield strength and ultimate tensile strength of the alloy, although the trade-off with ductility still needs to be addressed.