Article
Materials Science, Ceramics
Daming Sun, Qi Zhang, Pengfei Liu, Lars R. Jensen, Deyong Wang, Morten M. Smedskjaer
Summary: This study investigates the effect of crystallization on the mechanical and optical properties of barium titanosilicate glass-ceramics. It is found that crystallization increases the size and content of crystals, leading to improved fracture toughness and hardness but decreased transparency.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Kuo-Hao Lee, Yongjian Yang, Linfeng Ding, Benedikt Ziebarth, John C. Mauro
Summary: In this study, hot-compression of two multicomponent borosilicate glasses, Borofloat33 and N-BK7, was investigated using molecular dynamics simulations. The results showed that the improvement of fracture toughness (KIC) was mainly influenced by the change in Young's modulus under pressure, with Boro33 showing more effective enhancement due to its higher concentration of 3-coordinated boron (B-3) facilitating densification.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Hu Tang, Yong Cheng, Xiaohong Yuan, Kai Zhang, Alexander Kurnosov, Zhen Chen, Wenge Xiao, Henrik S. Jeppesen, Martin Etter, Tao Liang, Zhidan Zeng, Fei Wang, Hongzhan Fei, Lin Wang, Songbai Han, Ming-Sheng Wang, Guang Chen, Howard Sheng, Tomoo Katsura
Summary: Exceptional toughening in oxide glasses has been achieved via paracrystallization, resulting in the enhancement of crystal-like medium-range order structure. This discovery provides possibilities for the design of more resilient glass materials. The paracrystalline oxide glasses display superior toughness, surpassing any other reported bulk oxide glasses, potentially due to the excitation of multiple shear bands caused by a stress-induced inverse transformation from the paracrystalline to amorphous states, revealing plastic deformation characteristics.
Article
Chemistry, Multidisciplinary
Baozhong Li, Pan Ying, Yufei Gao, Wentao Hu, Lianjun Wang, Yang Zhang, Zhisheng Zhao, Dongli Yu, Julong He, Junyun Chen, Bo Xu, Yongjun Tian
Summary: The traditional hardness-toughness tradeoff has been a challenge for the development of superhard materials. In this study, heterogeneous diamond-cBN composites with high fracture toughness and hardness were successfully synthesized, shedding light on microstructure engineering in superhard materials for enhanced mechanical properties.
Article
Materials Science, Multidisciplinary
Gang Niu, Hatem S. S. Zurob, R. D. K. Misra, Qibo Tang, Zhihui Zhang, Minh-Tam Nguyen, Lili Wang, Huibin Wu, Yu Zou
Summary: In this study, we have achieved high fracture toughness and ductility in a high-strength austenitic stainless steel through cold rolling, flash annealing, and tempering processes. The steel exhibits a heterogeneous lamellar microstructure composed of reversed austenite lamellae and partially recrystallized austenite lamellae, leading to improved fracture resistance and toughness.
Article
Nanoscience & Nanotechnology
C. Chen, S. Y. Yang, R. Liu, Y. Chen, Y. R. Mao, S. Wang, Z. Zhang, L. M. Luo, Y. C. Wu
Summary: Tungsten/tantalum multilayer composites exhibit higher flexural strength and fracture toughness, with the best performance at lower bonding temperatures. Both flexural strength and fracture toughness decrease as bonding temperature increases, mainly due to changes in the interfacial microstructure and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Characterization & Testing
Qiong Rao, Zeyu Ouyang, Xiongqi Peng
Summary: The study found that the 0.75 wt% MWCNTs/GNPs hybrid exhibited the best toughening effect, with a 286% improvement in fracture toughness compared to pure adhesive. PVP was shown to have a positive effect on the fracture toughness of single nanofillers but decreased the toughening effect of MWCNTs/GNPs hybrids.
Article
Materials Science, Multidisciplinary
Xuefeng Yang, Zhengxin Li, Fuming Deng
Summary: The addition of graphene nanosheets can improve the performance of PDC composites, with 0.2 wt% of graphene nanosheets showing the best comprehensive performance, enhancing impact toughness and increasing heat-resistant temperature.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Engineering, Multidisciplinary
You Zesheng, Luo Shusen, Lu Lei
Summary: The study found that while an increase in NTB length had marginal effect on tensile strength, it significantly enhanced fracture initiation toughness and crack growth toughness, indicating that longer NTBs can not only intrinsically strengthen crack tip plasticity, but also extrinsically resist fracture by serving as crack bridges behind the crack front.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Nanoscience & Nanotechnology
Z. K. Ji, X. G. Qiao, W. T. Sun, L. Yuan, F. G. Cong, G. J. Wang, M. Y. Zheng
Summary: The effects of bimodal microstructure on the tensile properties and fracture toughness of Mg-9Gd-4Y-0.5Zr alloys were investigated. The results showed that the bimodal grain structure exhibited better yield strength and plane strain fracture toughness compared to the fully dynamic recrystallized (DRXed) microstructure. The bimodal grain structure had a higher tensile strength due to hetero-deformation induced (HDI) strengthening effect and strong basal texture. In addition, it had a stronger strain hardening capacity and larger hardened region, leading to improved fracture toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Composites
Jinsong Sun, Yue Han, Zehua Zhao, Guangxing Wang, Shuyi Zhan, Jiangnan Ding, Xiang Liu, Ying Guo, Heng Zhou, Tong Zhao
Summary: This study successfully improved the impact resistance and heat resistance of phthalonitrile polymers by synergistically toughening with specific composite materials, providing a new approach to addressing the brittleness issue in polymers.
COMPOSITES COMMUNICATIONS
(2021)
Article
Engineering, Multidisciplinary
Sammy He, Declan Carolan, Alexander Fergusson, Ambrose C. Taylor
Summary: In this study, the fracture toughness of syntactic foams was improved by modifying the epoxy polymer matrix. However, the increase in toughness was much smaller compared to the modification of bulk epoxy polymers. This is attributed to the small interstitial regions between the hollow glass microspheres in the syntactic foams, which restrict the size of the plastic zone.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Ceramics
Oliver Preuss, Enrico Bruder, Wenjun Lu, Fangping Zhuo, Christian Minnert, Jiawen Zhang, Juergen Roedel, Xufei Fang
Summary: This study focuses on the manipulation of mechanical properties through dislocation tuning in ceramics, showing that the fracture toughness of KNbO3 can be improved by a factor of 2.8 by introducing high dislocation densities. Microstructures, including dislocations and domain walls, were examined using various microscopy techniques to understand the toughening mechanisms. The origin of the toughening effect was found to be dislocations through high-temperature indentation tests.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
M. Bentoumi, E. H. Raouache, Z. Driss, A. Montagne, A. Iost, A. Mejias, D. Chicot
Summary: Instrumented indentation testing is commonly used to evaluate the mechanical properties of materials, particularly for brittle materials prone to cracking during indentation. The pop-in phenomenon, observed in multicyclic loading tests, can be used to characterize the cracking resistance of the materials. Indentation fracture toughness (KIc) can be calculated from crack length measurements to compare the resistance to cracking of different materials.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Z. K. Ji, X. G. Qiao, L. Yuan, F. G. Cong, G. J. Wang, M. Y. Zheng
Summary: In this study, a high strength Mg-9Gd-4Y-1Zn-0.5Zr alloy was designed, achieving a yield strength of 430 MPa and a plane-strain fracture toughness KIc of 23.1 MPa•m1/2. The increased KIc was attributed to the stress dissipation induced by interactions between tensile twinning and the kinking of the lamellar γ' phase. The fracture resistance was significantly improved by the activation of non-basal (a) and (c + a) dislocations in the fine dynamic recrystallized grains.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Zhimin Chen, Tao Du, Soren S. Sorensen, Rasmus Christensen, Qi Zhang, Lars R. Jensen, Oxana V. Magdysyuk, Maria Diaz-Lopez, Mathieu Bauchy, Yuanzheng Yue, Morten M. Smedskjaer
Summary: This study investigates the structural origins and property variations of lithium borophosphate glass electrolytes using experimental and simulation techniques. The research finds that the fracture toughness and ionic conductivity of the electrolytes are influenced by boron bonding and the lithium-ion migration is affected by medium-range order structure.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Soren S. Sorensen, Xiangting Ren, Tao Du, Ayoub Traverson, Shibo Xi, Lars R. Jensen, Mathieu Bauchy, Satoshi Horike, John Wang, Morten M. Smedskjaer
Summary: This work demonstrates that water can depolymerize polyhedra with labile metal-ligand bonds in a cobalt-based coordination network, resulting in nonstoichiometric glasses. The addition of water molecules promotes the breakage of network bonds and coordination number changes, thereby lowering melting and glass transition temperatures. These structural changes alter the physical and chemical properties of the glass, similar to the concept of modifiers in oxides. This approach can be extended to other transition metal-based coordination networks, enabling diversification of hybrid glass chemistry.
Article
Nanoscience & Nanotechnology
Wei Fan, Lars R. Jensen, Yibing Dong, Abigail J. Deloria, Bengang Xing, Donghong Yu, Morten M. Smedskjaer
Summary: Superior flexibility and toughness can be achieved in bioactive hydrogels by using a double polymer network with complementary properties. In this study, polyacrylic acid (PAA) and sodium alginate (SA) were combined to obtain a dual-reinforced double interpenetrating network (d-DIPN) hydrogel. The reinforcement involved ionic cross-linking and introduction of SiO2 nanoparticles, leading to significant improvements in strength and toughness. Furthermore, the hydrogel exhibited swelling resistance, self-healing behavior, adhesive abilities, and shape memory performance. Despite a reduction in breakage strain and stress, the biocompatibility and bone cell proliferation ability of the hydrogel were improved through a mineralization process. Overall, this work provides a pathway for the design of strong and tough hydrogels with potential applications in biomedicine and tissue engineering.
ACS APPLIED BIO MATERIALS
(2023)
Article
Materials Science, Ceramics
Daming Sun, Qi Zhang, Pengfei Liu, Lars R. Jensen, Deyong Wang, Morten M. Smedskjaer
Summary: This study investigates the effect of crystallization on the mechanical and optical properties of barium titanosilicate glass-ceramics. It is found that crystallization increases the size and content of crystals, leading to improved fracture toughness and hardness but decreased transparency.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Szymon Starzonek, Aleksander Szpakiewicz-Szatan, Sylwester J. Rzoska, Aleksandra Drozd-Rzoska, Michal Bockowski, Tomasz K. Pietrzak, Jerzy E. Garbarczyk
Summary: This paper investigates systems formed in a solid glassy state after a nanocrystallization process above the glass temperature. It analyzes the electric conductivity and relaxation processes after treatment under high temperature and high pressure. The results show an increase in density, electric conductivity, and qualitative changes in dynamics processes. The paper also introduces a new method for data analysis based on the activation and critical-like nature of processes. It provides evidence of pressure evolution of the glass and crystallization temperatures, indicating the unique possibility of maxima and crossovers.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Elsebeth J. Pedersen, Theany To, Soren S. Sorensen, Rasmus Christensen, Johan F. S. Christensen, Lars R. Jensen, Michal Bockowski, Oxana V. Magdysyuk, Maria Diaz-Lopez, Yuanzheng Yue, Morten M. Smedskjaer
Summary: Methods to improve the fracture toughness of oxide glasses are needed due to their low fracture toughness being a major limitation for their applications. Investigating the effect of short-and medium-range structural features on fracture toughness is crucial. Recent research has achieved a record-high fracture toughness for a bulk lithium aluminoborate glass through hot compression. This study further explores the structural origin of this high fracture toughness by subjecting different alkali aluminoborate glasses to hot compression, revealing correlations between structural changes and increased fracture toughness.
PHYSICAL REVIEW MATERIALS
(2023)
Review
Physics, Applied
Maciej Matys, Kazuki Kitagawa, Tetsuo Narita, Tsutomu Uesugi, Michal Bockowski, Jun Suda, Tetsu Kachi
Summary: This review briefly summarizes the major challenges and recent progress in the development of GaN Junction Barrier Schottky (JBS) diodes using selective-area p-type doping with ion implantation and ultra high-pressure annealing (UHPA) process. The high-performance JBS diodes demonstrated superior electrical characteristics and nondestructive breakdown.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Yuki Hatakeyama, Tetsuo Narita, Michal Bockowski, Tetsu Kachi, Masamichi Akazawa
Summary: The gap states near the conduction band edge in Mg-ion-implanted GaN and Al2O3 interface were investigated, and the gap state density can be improved through capless ultra-high-pressure annealing.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
Theany To, Alexandra A. K. R. K. Olsen, Bodil A. Hansen, Katrine M. Enevoldsen, Victor Lutken, Lars R. Jensen, Randall E. Youngman, Morten M. Smedskjaer
Summary: The role of Ga2O3 in oxide glasses is not well understood compared to other network forming oxides, so this study investigates the structure and mechanical properties of sodium gallioborate glasses and compares them to sodium aluminoborate glasses. The results show that the substitution of Ga2O3 for B2O3 increases the fraction of tetrahedral Ga units and decreases the fraction of tetrahedral B units. However, unlike in aluminoborate glasses, higher-coordinated polyhedra are not observed even in the pergallic region.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Rasmus Christensen, Yossi Bokor Bleile, Soren S. Sorensen, Christophe A. N. Biscio, Lisbeth Fajstrup, Morten M. Smedskjaer
Summary: By using molecular dynamics simulations, we found that ZIF-76, compared to ZIF-4 and ZIF-62, retains more medium-range order structures during the melting process, leading to a higher porosity in its glass state after melt-quenching.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Qi Zhang, Rasmus Christensen, Mikkel L. Bodker, Tao Du, Theany To, Francisco Munoz, Mathieu Bauchy, Morten M. Smedskjaer
Summary: The relationship between the microstructure, mechanical properties, and transparency of Na2O-P2O5-SiO2 glass-ceramics was investigated. The mechanical properties were determined by the crystal type, content, size, and remaining glass-matrix structure. Changes in crystallization behavior and crystal size had opposite effects on crack resistance and fracture toughness. The glass-ceramic samples exhibited high transmittance and a maximum fracture toughness of 1.1MPam(0.5).
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yongbao Xiao, Tao Du, Soren S. Sorensen, Zhimin Chen, Christophe A. N. Biscio, Lisbeth Fajstrup, Mathieu Bauchy, Morten M. Smedskjaer
Summary: The medium-range order (MRO) structure of zinc phosphate glasses is studied using persistent homology (PH) method, and the contributions of different ring structures to the structure factor are decomposed.
PHYSICAL REVIEW MATERIALS
(2023)