Article
Materials Science, Ceramics
Yuxiang Zhao, Yuxue Ge, Xiaochao Jin, Denise Koch, Robert Vassen, Yao Chen, Xueling Fan
Summary: This paper focuses on the oxidation behavior of novel double-ceramic-layer thermal barrier coatings (DCL TBCs) deposited by atmospheric plasma spraying (APS) and suspension plasma spraying (SPS). Results showed that the developed APS-SPS DCL TBCs have better oxidation resistance than the single layer SPS TBC. In terms of oxidation rate and lifetime, segmented APS-SPS TBCs perform slightly better than columnar APS-SPS TBCs. Among the various APS-SPS TBCs, segmented dense APS-SPS TBCs with low vertical crack density appear to have more potential for industrial application.
CERAMICS INTERNATIONAL
(2022)
Review
Materials Science, Multidisciplinary
Cheng Zhang, Di Ouyang, Simon Pauly, Lin Liu
Summary: Bulk metallic glasses (BMGs) as metallic materials without long-range order have attracted significant attention from academia and industry in the past three decades. The emerging 3D printing technology provides a viable route to overcome the challenges inherent in conventional processing routes and expand the applications of BMGs.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Article
Materials Science, Ceramics
Tuo Wang, Lianshun Zhang, Qiqi Hou, Qi Hao, Jichao Qiao
Summary: The plasticity of Fe75Mo5P13C7 BMG can be improved by annealing at low temperature due to nano-crystallization and remaining free volume. The correlation of plasticity with micro-structure, relaxation, and free volume characteristic varies in Fe75Mo5P13C7 BMG with its annealed state under different temperatures. The plasticity will be largest when the ratio of nanocrystals is equivalent to the free volume.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Nanoscience & Nanotechnology
Tuo Wang, Qiqi Hou, Lianshun Zhang
Summary: The addition of oxygen was found to enhance the plasticity of Zr60Cu25Al15 bulk metallic glass, but excessive oxygen deteriorated its plasticity, leading to partial crystallization. The improved plasticity was attributed to a heterogeneous Cu-rich amorphous phase, while the decrease in plasticity was caused by excessive oxygen leading to partial crystallization.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Liliang Shao, Lin Xue, Qianqian Wang, Kaili Ma, Jindu Huang, Baolong Shen
Summary: In this study, the glass-forming ability of DyCoAl bulk metallic glass was improved by microalloying with Si element. The addition of Si affected the crystallization behavior of the BMG, changing the nucleation process and the growth rate of crystalline particles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Jianjie Hao, Jiayan Li, Binglin Zou, Xiaolong Cai, Wei Shi, Yi Tan
Summary: The poor oxidation resistance of the ZSA coating is mainly due to the inability to seal cracks and holes, while the decreased oxidation resistance of the ZSS coating is mainly caused by the formation of large holes in the coating and increased viscosity.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Qi Jiang, Peilei Zhang, Jie Tan, Zhishui Yu, Yingtao Tian, Songyun Ma, Di Wu
Summary: In this study, Fe-based bulk metallic glass was successfully produced using selective laser melting, with optimized parameters resulting in high relative density and amorphous rate samples. The analysis revealed the presence of various crystalline phases in the heat affected zone, and heat treatment was utilized to study the crystallization behavior of the amorphous phase. Variation in hardness was observed among different grain regions, with the highest hardness found in the amorphous phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Mingyu Xie, Gan Ding, Minqiang Jiang, Faxin Li
Summary: Experimental results show that under high-frequency vibration, an irreversible internal friction peak is observed near the onset crystallization temperature in Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit-1) bulk metallic glass. After preheating treatment, the internal friction peak decreases significantly, and the final modulus values are proportional to the crystallinity. These phenomena can be well explained through a three-parameter anelastic solid phenomenological model.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Engineering, Manufacturing
Zerong Yang, Matthias Markl, Carolin Koerner
Summary: Laser powder bed fusion (L-PBF) technology is used to fabricate BMG parts. By coupling the Nakamura model with L-PBF process simulation, a method for determining crystallization parameters and a numerical implementation method have been developed. Numerical simulations and experimental validation provide a comprehensive understanding of BMG crystallization behavior during L-PBF.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Coatings & Films
Jing Hu, Peng Liu, Qi Li, Jianliang Xie, Shaoliang Jiang, Xianyu Jiang, Xin Wang, Li Zhang, Liangjun Yin, Haipeng Lu, Longjiang Deng
Summary: The spraying power significantly influences the physical properties and oxidation resistance of ZrB2-LaF3 coatings, with both too low and too high powers leading to deteriorated coating quality. Moderate spraying power is found to be optimal for achieving desired coating characteristics.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Chen Chen, Yanzhou Fan, Weiwei Zhang, Hang Zhang, Ran Wei, Shaokang Guan, Tan Wang, Tao Zhang, Fushan Li
Summary: This study investigated the effects of adding Oxygen to Zr50Ti4Y1Al10Cu25Ni7Co2Fe1 complex multicomponent bulk metallic glass on its microstructure, thermal stability, and mechanical properties. It was found that Oxygen promoted the formation and growth of nanocrystals, leading to a change in the structure of the nanocrystalline phase. Interestingly, even at high Oxygen concentrations, the alloy still exhibited excellent resistance to Oxygen-induced brittleness.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Saijyothi Nagireddi, D. Arvindha Babu, B. Srinivasarao, Bhaskar Majumdar
Summary: This work describes the fabrication of cylindrical bulk specimens of Hf-based bulk metallic glass by spark plasma sintering, utilizing different milling techniques to convert amorphous ribbons into powders. The study demonstrates the potential of spark plasma sintering in consolidating amorphous powders to near full density cylindrical pellets, with different particle sizes showing varying densification behavior. The presence of nano crystallites and the effect of compaction temperature on the formation of amorphous phase were also investigated in the study.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Condensed Matter
Zhu Li, Zhang Xia, Wang Hongying, Cai Pengfei, Mahander Pandey
Summary: The study investigated the effects of Ni microalloying on the crystallization kinetics of Fe(CoNi)PB BMG, showing that Ni addition increased thermal stability and glass forming ability. Higher annealing temperatures intensified exothermic peaks and reduced incubation period for crystallization. Ni addition resulted in slower crystallization compared to Ni-free samples.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Ceramics
Pavan Bijalwan, Charu Singh, Anil Kumar, Kuntal Sarkar, Nitu Rani, Tapas Laha, Atanu Banerjee, K. Mondal
Summary: The Fe-based composite coatings deposited by atmospheric plasma spraying showed better corrosion resistance compared to the steel substrate, regardless of the coating thickness. The coating with a thickness of 110 +/- 12 μm exhibited the best corrosion resistance, attributed to optimal content of amorphous, porosity, and surface roughness.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Alireza Jalali, Mehdi Malekan, Eun Soo Park, Reza Rashidi, Ahmad Bahmani, Geun Hee Yoo
Summary: A new non-equiatomic high entropy bulk metallic glass (HEBMG) was developed in this study based on the Cu47Zr47Al6 prototype BMG. Kinetic studies were performed comparing the thermal properties of the BMG and HEBMG, showing differences in activation energies and structural relaxation enthalpy. Compression tests confirmed a 58% improvement in plastic strain for the HEBMG compared to the BMG.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
The Ky Vo, Tra Phuong Trinh, Van Cuong Nguyen, Jinsoo Kim
Summary: In this study, a series of hybrid GrO/MIL-101(Cr) (GrO@MCr) nanocomposites were prepared via hydrothermal synthesis, showing increased adsorption capacities for organic pollutants MO and RB198. The adsorption mechanism was detailedly studied in this research.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Applied
The Ky Vo, Van Cuong Nguyen, Duong Tuan Quang, Bum Jun Park, Jinsoo Kim
Summary: The rapid construction of defects in metal-organic frameworks using microwave-assisted reactors can significantly impact porosity and CO2 adsorption capabilities of the material. The concentration of defects influences the amount of CO2 uptake and selectivity, surpassing those of conventionally prepared materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jin Hyuck Heo, Kyungmin Im, Hyong Joon Lee, Jinsoo Kim, Sang Hyuk Im
Summary: Ni,Ti-co-doped MoO2 nanoparticles were synthesized with excellent moisture stability and improved conductivity for use as hole transporting material in metal halide perovskite solar cells. The Ni,Ti-doped MoO2 showed better reduction stability and achieved a power conversion efficiency of 18.1% under standard conditions. Additionally, the unencapsulated Ni,Ti-co-doped MoO2 showed only a 12-13% degradation after a stability test, indicating promising potential for practical applications.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Jeong Hee Lee, Jue-hyuk Jang, Jinsoo Kim, Sung Jong Yoo
Summary: This paper presents a novel oxygen reduction reaction (ORR) catalyst with high activity and long-term stability, which can be applied to fuel cell technologies. Through specific synthesis methods and carbonization conditions, the prepared catalyst exhibits excellent electrocatalytic performance.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Energy & Fuels
Kyungmin Im, Nguyen Quoc Hao, Eungjun Lee, Dong Wook Lee, Jinsoo Kim, Sung Jong Yoo
Summary: The study synthesized core-shell-type leaf-shaped CoFe-NC catalysts, achieving highly dispersed CoFe-doped carbon with excellent performance and durability in acidic medium. When applied as a cathode in PEMFC, the catalyst demonstrated significant effectiveness.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Seung Hyun Choi, Kyungmin Im, Sung Jong Yoo, Jinsoo Kim, Min-Sik Park
Summary: A spherical hollow carbon framework decorated with functional heteroatoms is designed and synthesized as a potential anode material for lithium metal batteries, offering enhanced reversibility and capability for metallic Li storage. The atomic-scale decorations of heteroatoms can effectively lower the overpotential for the nucleation and growth of metallic Li inside the hollow carbon framework, improving the cycle performance and rate capability even at high current densities.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Jungyeon Ji, Kyungmin Im, Heeyeon An, Sung Jong Yoo, Yongjin Chung, Jinsoo Kim, Yongchai Kwon
Summary: Hollow cobalt nitrogen-doped carbon (H-CoNC) is proposed as an anodic catalyst for membraneless hydrogen peroxide fuel cells (HPFC) and enzymatic biofuel cells (EBC), demonstrating superior catalytic activity for hydrogen peroxide oxidation reaction (HPOR) due to its porous and hollow-shell structure, along with a large amount of isolated Co atoms and coordinate bonds with Co and nitrogen (Co-N-4). The improved mass transfer to the active site results in enhanced current density at the bioanode and higher maximum power density (MPD) for both EBC and HPFC when using H-CoNC compared to conventionally synthesized catalysts.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Quoc Hao Nguyen, Kyungmin Im, Jinsoo Kim
Summary: In this study, hollow Fe, Co, and nitrogen co-doped carbon catalyst with high surface area and uniformly distributed Fe and Co species was prepared, demonstrating excellent ORR performance, stability, and tolerance to methanol crossover.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Toan Minh Pham, Kyungmin Im, Jinsoo Kim
Summary: This study presented a tungsten-modified titanium dioxide support for platinum catalyst, which showed improved catalytic activity and stability, offering a potential solution to the carbon corrosion issue in proton exchange membrane fuel cells.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Sion Oh, Kyungmin Im, Jinsoo Kim
Summary: Developments in fuel cell technology have led to the design of efficient electrocatalysts for the oxygen reduction reaction (ORR). Metal-nitrogen-carbon (M-N-C) catalysts, particularly carbon nanotube-encapsulated hollow Co-Fe-NC electrocatalysts, show promising catalytic activity and excellent selectivity for ORR. However, the synthesis of carbon-based metal electrocatalysts with evenly distributed active sites and well-controlled structures remains challenging.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Thuan Anh Vo, Yoonmo Koo, Jinsoo Kim, Seung-Soo Kim
Summary: This study characterized non-precious metal catalysts over activated carbon and TiO2-SiO2 supports loaded via incipient wetness impregnation and spray pyrolysis. The research found that activated carbon exhibited better performance in syringol conversion and hydrocarbon selectivity compared to TiO2-SiO2. Additionally, the Ni catalyst showed more effective hydrodeoxygenation performance compared to Fe and NiFe catalysts. The study provides a promising potential for the utilization of non-precious metals and biomass-derived activated carbon in removing oxygen from bio-oil model compounds, contributing to sustainable renewable energy development.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Hind Jihad Kadhim Shabbani, Ammar Ali Abd, Tharveen Raj Rajalingam, Jinsoo Kim, Mohd Roslee Othman, Zuchra Helwani
Summary: This study investigates the use of microporous APKS and ZIF-8 adsorbents for capturing carbon dioxide from flue gas surrogate. The lab simulated and experimented with the purity and recovery of N2 and CO2 in the product and waste stream. The results show that factors like adsorbent type, adsorption times, and CO2 concentration influence the N2 purity in the product stream, while CO2 feed compositions, adsorbent type, and pressure swing operation affect the purity and recovery of CO2 in the waste stream.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Dieu-Phuong Phan, Toan Minh Pham, Hojin Lee, My Ha Tran, Eun Duck Park, Jinsoo Kim, Eun Yeol Lee
Summary: A series of zeolite-porous metal-organic framework composites with different Pt loadings were synthesized via a two-step approach. The Pt-loaded composites showed improved acidity compared to the parent materials and demonstrated high catalytic performance and stability in the selective hydrodeoxygenation process.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Applied
Van Nhieu Le, Van Cuong Nguyen, Huu Trung Nguyen, Hoai Duc Tran, Thach N. Tu, Woo-Sik Kim, Jinsoo Kim
Summary: Bimetallic metal-organic frameworks with two different metal species demonstrate higher effectiveness in CO2 capture and separation performance than their monometallic counterparts. A series of bimetallic MIL-100(Fe, Al) was synthesized by adding Fe and Al metal precursors with various molar ratios. Among the investigated samples, MIL-100(Fe, Al)#2 showed the highest CO2 adsorption capacity of 3.27 mmol g-1 with an IAST-CO2/N2 selectivity of 76.5 at 25 degrees C and 1 bar. This facile synthetic route has the potential to enhance CO2 adsorption performance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Energy & Fuels
Hind Jihad Kadhim Shabbani, Ammar Ali Abd, Masad Mezher Hasan, Zuchra Helwani, Jinsoo Kim, Mohd Roslee Othman
Summary: The study investigated hydrogen purification from a surrogate gas using spent coffee grounds as a medium. The process was examined under isothermal, adiabatic, and non-adiabatic conditions using Aspen adsorption software. The results showed that spent coffee grounds can effectively purify hydrogen, and a rectangular non-adiabatic plate column can enhance the purification process by improving purity and recovery responses.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.
