Article
Materials Science, Multidisciplinary
Ruitao Qu, Robert Maass, Zengqian Liu, Dominik Tonnies, Lin Tian, Robert O. Ritchie, Zhefeng Zhang, Cynthia A. Volkert
Summary: This study discovered the strongest metallic alloy known, which is flaw-insensitive at the micrometer scale and exhibits properties that deviate from traditional theories. The experimental results show that the fracture toughness of this ultra-strong glassy alloy increases with increasing sample size.
Article
Chemistry, Physical
Priyanka Saini, R. Lakshmi Narayan
Summary: The variations in local yield strength and plasticity of a Zr-based bulk metallic glass at different fictive temperatures were studied using nanoindentation and microindentation. The results showed an increase in incipient plastic events and subsequent pop-ins with increasing fictive temperature. Statistical analysis of strength scatter was used to determine the activation parameters for shear transformation zones (STZs) in all specimens. The increase in shear yield strength and plasticity with increasing fictive temperature was explained by considering the linear accumulation of STZs to form a shear band.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Wook Ha Ryu, Kyung Jun Kim, Min Kyung Kwak, Chae Woo Ryu, Eun Soo Park
Summary: This research provides a practical guideline to significantly reduce production costs of metallic glasses (MGs) through tailored alloy design and precise control of thermoplastic forming (TPF) process parameters. It is discovered that commercially available MGs with a low glass transition temperature (Tg) can be developed in the Zr-rich alloy systems. Moreover, the challenge of maintaining a wide TPF window in Be-free Zr-based MGs while keeping Tg low has been addressed.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Yeong-Seong Kim, Woo-Chul Kim, Won-Tae Kim, Do-Hyang Kim
Summary: The addition of Sn has significantly improved the thermoplastic forming ability of Ti-Zr-Ni-Cu metallic glass, leading to changes in crystallization behavior and smaller grain size, indicating enhanced thermal stability.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
S. J. Wu, Z. Q. Liu, R. T. Qu, Z. F. Zhang
Summary: By establishing quantitative correlations among compositions, elastic constants, GFA, and mechanical properties of metallic glasses (MGs), it is possible to predict their performance in advance. Experimental data confirms the validity of this predictive approach. A strategy for designing MGs with optimal combinations of strength, toughness, and GFA is proposed to allow for high-throughput discovery of glass formers with excellent mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Wook Ha Ryu, Chae Woo Ryu, Min Kyung Kwak, Eun Soo Park
Summary: This study provides practical guidelines for tailoring the thermoplastic forming (TPF) process in bulk metallic glasses (BMGs) and investigates the influence of process variables. A continuous heating transformation (CHT) diagram was constructed for LM1b (Zr44Ti11Cu10Ni10Be25) using Flash-DSC measurement, and three TPF procedures from bulk to nano scales were demonstrated. A new TPF parameter, P, was proposed to compare the TPF ability of different BMGs. These results enable the selection of suitable BMGs and optimization of TPF processes, leading to improved performance and expanded applications in various industries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jiahua Zhu, Wenjin Gao, Sirui Cheng, Xiaodi Liu, Xiaofeng Yang, Jinsen Tian, Jiang Ma, Jun Shen
Summary: The effect of substituting Zr with Sc on the glass forming ability (GFA) and mechanical properties of ZrCuNiAlTi bulk metallic glass (BMG) is reported in this study. It was found that the substitution of Zr with Sc improved the GFA of ZrCuNiAlTi BMG. The large atomic radius of Sc and small Gibbs free energy difference between the supercooled liquid and crystalline solid inhibited crystallization and improved GFA. Compression test results showed that the ZrCuNiAlTiSc BMG had increased plasticity and retained high fracture stress. The high relaxed excess free volume (REFV) in ZrCuNiAlTiSc BMG contributed to the increased plasticity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Wei Guo, Mingzi Wang, Zhenhua Qin, Xu Shen, Shulin Lu, Xiaohua Chen, Shusen Wu
Summary: The doping of Ta in TiCu-Ni-Zr bulk metallic glass composite improves glass-forming ability and mechanical properties, resulting in a homogeneously distributed spherical B2 phase with enhanced plasticity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Shan Zhang, Chao Wei, Zhilin Shi, Haoran Zhang, Mingzhen Ma
Summary: Fe doping significantly improves the glass-forming ability, stability, and mechanical properties of Zr50Cu34-xFexAl8Ag8 metallic glasses. The addition of Fe inhibits the formation of crystalline phases, increases the glass-forming ability, and enhances the fracture strength and ultimate strain of the metallic glass samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Yongping Kang, Yupeng Wu, Yangyang Pan, Qi Peng, Ze Liu
Summary: This paper investigates the mold filling dynamics of BMGs in the supercooled liquid region through finite element simulations and experiments. The phase diagram predicting the reliable replication range of mold geometric parameters is determined. It is found that improperly designed molds can lead to complex filling dynamics and replication failure. This study provides new insights into the mold filling dynamics of highly viscous fluids and offers a guideline for thermoplastic molding of BMGs.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Physical
Mehdi Malekan, Reza Rashidi, Mansoor Bozorg, Nick Birbilis
Summary: The effect of yttrium (Y) on the glass-forming ability (GFA), mechanical properties and corrosion of (Cu50Z-r43Al7)100-xYx alloys was studied. The addition of Y improved the GFA of Cu50Zr43Al7 alloy, with a GFA of 15 mm obtained for (Cu50Zr43Al7)98Y2. The bulk metallic glasses (BMGs) exhibited limited plastic strain but achieved high compressive fracture strength and Young's modulus. The corrosion resistance of the BMGs was improved by the addition of Y.
Article
Multidisciplinary Sciences
Asghar Heydari Astaraee, Chiara Colombo, Sara Bagherifard
Summary: The metallization of polymers using cold spray technology has gained significant attention in recent years. However, there is currently a lack of an effective modeling approach to assess the bonding formation in polymer metallization. This study developed a finite element model to simulate the solid-state deposition of metallic particles on thermoplastic polymeric substrates, taking into account the polymer material properties and substrate thermal history. Experimental coating depositions and single-particle impact tests were conducted for model validation, and the proposed model showed accurate prediction of various impact features.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Ceramics
Y. Tan, Y. W. Wang, X. W. Cheng, Q. Fu, Z. H. Xin, Z. Q. Xu, H. W. Cheng
Summary: The study found that appropriate Al substitution can improve the glass-forming ability, strength, and plasticity of amorphous alloys, but fracture strength decreases and no dynamic compression plasticity is observed during dynamic loading.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Qianqian Wang, Xian Yang, Zhiqiang Cui, Lin Xue, Liliang Shao, Qiang Luo, Baolong Shen
Summary: This study investigates the impact of C/B ratio on the glass forming ability (GFA) and low-temperature magnetic properties of Fe42Co6Cr15Mo14CxB21-xTm2 metallic glasses. It was found that the critical diameter of bulk metallic glasses increases with higher C/B ratio, leading to stable magnetocaloric transition and changes in antiferromagnetic interactions between Fe and Cr. The fracture strength of the metallic glasses initially increases and then decreases with increasing C/B ratio, reaching the highest value at x = 15.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
Hui Wang, Wojciech Dmowski, Yang Tong, Zengquan Wang, Yoshihiko Yokoyama, Jittisa Ketkaew, Jan Schroers, Takeshi Egami
Summary: This study suggests that the plasticity of metallic glasses is related to the local atomic rearrangements under stress, rather than their atomic structure directly. By conducting experiments on various bulk metallic glasses, researchers found that the extent of local deviation from affine deformation within the elastic regime is strongly correlated with the plastic behavior of metallic glasses beyond yield.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Weidong Yan, Wengen Ouyang, Ze Liu
Summary: Structural superlubricity based on twisted layered materials has attracted significant research interest. Molecular dynamics simulations reveal a strong correlation between the size scaling of friction and Moire '-level oscillations in circular twisted bilayer graphene (tBLG). By proposing a theoretical formula and deriving an analytic expression, we successfully explain the observed abnormal scaling and provide a rational explanation for the measured scattered power scaling law in various experiments. Additionally, we demonstrate that the origin of the scaling law is related to the Moire ' boundary, highlighting its importance in the thermodynamic models of layered materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Xingya Li, Gengping Jiang, Meipeng Jian, Chen Zhao, Jue Hou, Aaron W. W. Thornton, Xinyi Zhang, Jefferson Zhe Liu, Benny D. D. Freeman, Huanting Wang, Lei Jiang, Huacheng Zhang
Summary: In this study, a strategy for fabricating angstrom-scale ion channels through the growth of metal-organic frameworks (MOFs) into nanochannels is reported. These nanochannels exhibit higher ion conductivity and mobility than MOF channels with hybrid pore configurations and sizes. Furthermore, the three-dimensional (3D) MOF channels demonstrate better ion sieving properties compared to one-dimensional (1D) and two-dimensional (2D) MOF channels. This research provides a platform for studying ion transport properties at angstrom-scale confinement and offers guidelines for improving ionic separations and nanofluidics efficiency.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Jun Lu, Gengping Jiang, Huacheng Zhang, Binbin Qian, Haijin Zhu, Qinfen Gu, Yuan Yan, Jefferson Zhe Liu, Benny D. Freeman, Lei Jiang, Huanting Wang
Summary: An artificial sodium channel with unprecedented Na+/K+ selectivity and Na+/Li+ selectivity was developed by confining 4'-aminobenzo-15-crown-5 ethers (15C5s) into a metal-organic framework subnanochannel (MOFSNC). This study proposed a co-ion-responsive single-file transport mechanism for the preferential transport of Na+ over K+ in the 15C-MOFSNC. The findings offer an alternative strategy for developing single-ion selective channels and membranes.
Article
Materials Science, Multidisciplinary
Kaiyun Chen, Junkai Deng, Wangtu Huo, Dongxiao Kan, Qian Shi, Mengshan Song, Xi Zhao, Sen Yang, Jefferson Zhe Liu
Summary: In this paper, density functional theory calculations are used to study the magnetic-structure anisotropy association and strain induced structure variants switching behavior of ferroelastic 1T'-CrS2 and CrSe2. It is found that in the ferromagnetic (FM) 1T' phase, the easy magnetization axis is always perpendicular to Cr-Cr zigzag chain. Additionally, mechanical strain can alter the relative thermodynamic stability among the different crystal orientation variants of both the FM and nonmagnetic (NM) 1T' phase. These findings provide insights into strain-controlled magnetic moment rotation and offer potential solutions for reducing energy consumption in miniaturized spintronics devices.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jing Li, Bintong Huang, Yuanhao Wang, Aijia Li, Yong Wang, Yangyang Pan, Jia Chai, Ze Liu, Yueming Zhai
Summary: The single-molecule technique for investigating unlabeled proteins in solution is challenging, but nanopore sensing offers a label-free tool for collecting structural information. This study developed a reliable method to convert a silicon nitride nanopore into a stable nanonet platform for single-entity sensing. The nanonet provides more structural information and captures the UV-light-induced structural-change process of individual proteins.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Jing-Yu Xu, Peng-Cheng Zhang, Rong Guo, Li-Xue Liu, Yong-Ping Kang, Ze Liu, Cheng Zhang, Lin Liu
Summary: This study investigates the effect of structural heterogeneity derived from additive manufacturing process on the mechanical properties of Al alloys. Elaborately designed Al-Fe-Cu-xZr alloys were subjected to laser powder bed fusion. It is found that the alloys exhibit heterogeneous structures with two distinct zones, and the Al-Fe-Cu-0.8Zr alloy shows the best combination of high yield strength, plasticity, and resistance to crack propagation. The enhanced fracture toughness is attributed to the difference in local hardness at the interfaces between the two zones. This work provides a promising strategy for toughening additively manufactured Al alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Fuwang Wen, Yuan Yan, Shirong Sun, Xu Li, Xing He, Qingwei Meng, Jefferson Zhe Liu, Xueqing Qiu, Wenli Zhang
Summary: Nitrogen doping enhances the capacitive performance of zinc-ion hybrid supercapacitor by promoting pseudocapacitive reactions through lowering the energy barrier for the change of oxidation states of carbonyl moieties. The as-constructed zinc-ion hybrid supercapacitors, with nitrogen/oxygen dopants and 3D interconnected hierarchical porous carbon matrix, exhibit high gravimetric capacitance and excellent rate capability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Peng Li, Yuanpeng Yao, Wengen Ouyang, Ze Liu, Huayi Yin, Dihua Wang
Summary: In this study, a FeCoNiMnMo high entropy alloy (HEA) electrode was prepared for stabilizing oxygen evolution in chlorine-containing electrolytes without corrosion inhibitors. The electrode exhibited excellent electrocatalytic activity and stability, with the protective layer containing K2MoO4 playing a crucial role in chlorine resistance. Additionally, the high-entropy effect of the HEA reduced alloy dissolution.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Zhicheng Feng, Yuanpeng Yao, Jianxin Liu, Bozhao Wu, Ze Liu, Wengen Ouyang
Summary: An anisotropic interlayer potential is developed to accurately describe the van der Waals interaction between water and graphene. The force field is benchmarked against density functional theory and shows good agreement with reference data sets, indicating improved empirical description of water-graphene interfacial interactions. Molecular dynamics simulations based on this force field predict water contact angles that are close to experimental measurements, demonstrating the hydrophilic nature of graphene. This theoretical approach can be extended to study the wetting properties of heterointerfaces formed with water and other two-dimensional materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Chuang Yang, Peiyao Wang, Zhiyuan Xiong, Xin Wu, Hui Chen, Jing Xiao, Guangmin Zhou, Lixin Liang, Guangjin Hou, Dan Li, Jefferson Zhe Liu, Hui-Ming Cheng, Ling Qiu
Summary: Researchers used a micro-stamping method to create a perpendicular micro-hole array in a thick, dense MoS2-based electrode, improving the efficiency of ion transport in 2D nanosheet-based films. The electrode exhibited high capacity, density, and conductivity, making it suitable for high-capacity supercapacitors.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Physical
Weijie Yang, Bo Cheng, Jianhua Hou, Junkai Deng, Xiangdong Ding, Jun Sun, Jefferson Zhe Liu
Summary: An electrical-biased or mechanical-loaded scanning probe can generate programmable domain nanopatterns on ferroelectric surfaces, which is important for nanoscale electronics. Using monolayer alpha-In2Se3 ferroelectric as an example, it is discovered that the writing-speed affects the threshold voltages and forces for domain switching. The findings reveal the importance of addressing ferroelectric domain pattern engineering for direct-writing electronics applications.
Article
Chemistry, Multidisciplinary
Jianxin Liu, Xiaoqi Yang, Hui Fang, Weidong Yan, Wengen Ouyang, Ze Liu
Summary: This article reviews the latest advances in in situ twistronics, discussing the underlying superlubricity mechanism and showcasing real-time twistronic testing under a scanning electron microscope. The study shows that the real-time testing technique allows for visualizing and monitoring the interface status. By leveraging the tribological properties of van der Waals layered materials, this novel platform not only improves the fabrication of twistronic devices but also enhances the understanding of interface phenomena. Moreover, this platform holds promising opportunities for integrating twistronics into various mechanical frameworks.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Seyed Hesam Mousavi, Javad Tamnanloo, Abdol Hadi Mokarizadeh, Ali Zavabeti, Jefferson Zhe Liu, Gang Kevin Li
Summary: Natural gas reservoirs often contain a significant amount of nitrogen (N2), which needs to be removed before transferring or storing natural gas. Currently, cryogenic distillation is the main industrial method for nitrogen rejection, but it consumes a lot of energy. This study introduces NaZSM-25, a zeolite that can selectively adsorb N2 over CH4 at room temperature, with exceptional selectivity and performance compared to previous adsorbents.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(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.
