Article
Chemistry, Physical
Sida Ma, Nanfu Zong, Zihui Dong, Yaowen Hu, Tao Jing, Yanjun Li, Ragnvald H. Mathiesen, Hongbiao Dong
Summary: An ab-initio study on (0001) TiB2/Al-Ti interface shows that Ti-adsorption enhances α-Al nucleation by promoting strain release and lattice-mismatch superiority. Ti-adsorbed TiB2/Al atomistic interfacial models are used to simulate Ti-terminated TiB2/Al and B-terminated TiB2/Al interfaces. Formation of Al3Ti intermediate layer induces dislocations at the interfaces, leading to the release of interfacial strain and free-growth of α-Al.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Fei Liu, Zhiyi Liu, Guangyu He
Summary: The microstructure evolution and its effect on the strength properties and fatigue performance of the Al-Cu-Mg alloy have been investigated. The results show that refining Goss-oriented grains can improve the strength-ductility trade-off and reduce the fatigue crack propagation rate.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Pengcheng Ma, Takahiro Masuda, Shoichi Hirosawa, Zenji Horita
Summary: By subjecting three different compositions of Al-Cu-Mg alloys to high-pressure torsion (HPT) and subsequent aging treatment, the hardness of the alloys increased significantly and the average grain sizes were refined to nanoscale. After aging treatment, the hardness further increased due to the strengthening mechanisms of grain refinement and nanoscale precipitates. The contribution of different strengthening mechanisms was quantitatively evaluated.
MATERIALS TRANSACTIONS
(2023)
Review
Materials Science, Multidisciplinary
Feng Gao, Zhongyun Fan
Summary: Grain refinement is crucial for metallic materials as it improves castability, reduces casting defects and enhances mechanical properties. Solute is widely recognized as one of the key factors for achieving grain refinement, but the phenomenon is complex and also depends on the physical and chemical nature of nucleant particles.
Article
Materials Science, Multidisciplinary
Siyue Fan, Xuming Guo, Qingwei Jiang, Zhenhua Li, Jing Ma
Summary: This article focuses on a new Al-Cu-Mn-Ti-Zr aluminum alloy fabricated by pulsed gas metal arc additive manufacturing to refine the microstructure and alleviate the mechanical property anisotropy. The investigation shows that T6 heat treatment significantly improves the mechanical properties of the alloy samples, but the formation of pores reduces the elongation.
Article
Materials Science, Multidisciplinary
Yanqiang Li, Hongxiang Jiang, Hao Sun, Lili Zhang, Jie He, Jiuzhou Zhao
Summary: A theoretical model was developed to investigate the microstructure evolution during the solidification of a liquid-solid phase separation alloy under the influence of electric current pulses (ECPs). Experimental and simulation results demonstrated that ECPs can enhance melt convection through Joule heating, induce migration of minority phase particles, and effectively promote their nucleation and refinement. The peak current density of ECPs and the temperature drop in the nucleation region were found to be crucial parameters determining the refinement extent of minority phase particles.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Tong Liu, Maoliang Hu, Qingyu Ran, Bo Jiang, Zesheng Ji, Xiaobing Zhou
Summary: A novel aluminum alloy refining agent was prepared using materials generated during a machining process, and the effect of temperature and time on the second phase was investigated. The results showed that the refining agent could effectively decrease the grain size of aluminum alloy and increase its tensile strength.
Article
Chemistry, Physical
Jinhua Ding, Chao Wang, Cheng Lu, Guangming Zhu, Nana Guo, Xujie Gao, Xin Wang, Chunxiang Cui
Summary: The grain size of alloys is crucial in determining their properties, and adding inoculants can significantly decrease the grain size. In this study, an Al3Ti-Al2O3/Al inoculant was successfully prepared using Al-Ti master alloy and Al2O3 whiskers. The Al2O3 whiskers were uniformly dispersed within the inoculants with the aid of ultrasonic energy, and they were broken into small particles at high temperature. Vacuum rapid quenching treatment further improved the morphology of Al3Ti and achieved even particle dispersion throughout the matrix. The Al3Ti-Al2O3/Al inoculants demonstrated excellent grain refinement effects on the weldable Al-Cu-Mn alloy and improved its mechanical properties.
Article
Materials Science, Multidisciplinary
Chong Yang, Pengming Cheng, Baoan Chen, Jinyu Zhang, Gang Liu, Jun Sun
Summary: The study found that in Al-Sc alloys, the strengthening effect of Sc solute clusters is superior to that of Al3Sc precipitates, resulting in higher yield strength and ductility. The stability of Sc clusters at 250 degrees Celsius enables Al-Sc alloys strengthened by Sc solute clusters to have extensive applications across a wide temperature range due to their high temperature resistance.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Mohamed Ibrahim Abd El Aal
Summary: The research shows that through recycling using high-pressure torsion (HPT), almost fully dense ultrafine-grained microstructure can be achieved for pure Al chip and Al composite samples, with lower cost. After HPT processing, the hardness of Al chip and Al chip composites samples significantly increases.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Physical
K. Yan, Z. W. Chen, Y. N. Zhao, C. C. Ren, W. J. Lu, A. W. Aldeen
Summary: Rare earth element Sc has a strong grain refining effect on cast aluminum alloys by forming Al3Sc particles as heterogeneous nucleation cores, which can be observed via microscopy. The internal structure of Al3Sc particles shows coarse dendritic and fine cell structures, with white oxide residues in some particles. At the interface between Al3Sc and Al matrix, two parallel crystallographic ORs were observed along with a special pseudomorphic solid layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Shenbao Jin, Zhenjiao Luo, Xianghai An, Xiaozhou Liao, Jiehua Li, Gang Sha
Summary: This research investigates the effects of alloy composition on dynamic precipitation, segregation, and grain refinement under severe-plastic-deformation processing of Al-Si alloys. Si atoms segregate at dislocations and form Si precipitates at grain boundaries, impacting grain size significantly.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Xuebing Liu, Di Zhang, Hui Wang, Yu Yan, Xinfang Zhang
Summary: In this study, a novel manipulation pathway using pulsed electric field (PEC) was explored to control grain boundary structure and improve corrosion resistance in age-hardening aluminum alloys. The calculated atomic diffusion results showed that PEC can stimulate atomic diffusion by decreasing the energy required, inhibiting the formation of continuous distribution of grain boundary precipitates and solute depletion zone. This significantly enhanced the corrosion resistance.
Article
Metallurgy & Metallurgical Engineering
Qingyou Han
Summary: This article examines the impact of solutes on grain formation, with experimental data suggesting a clear correlation between grain size and the solidification range of the alloy. Mechanisms related to grain refining operate under specific experimental conditions.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Metallurgy & Metallurgical Engineering
Qingyou Han
Summary: This article examines the influence of solutes on grain formation, specifically focusing on the growth, fragmentation of dendrites, and resulting grain size. Experimental data from magnesium and aluminum alloys are analyzed, revealing a correlation between grain size and alloy solidification range. The study also highlights the role of dendrite fragmentation in grain refinement mechanisms.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Microscopy
A. J. Breen, A. C. Day, B. Lim, W. J. Davids, S. P. Ringer
Summary: In this study, a method was developed to enhance the contrast of poles and zone lines in atom probe data by plotting crystallographically correlated metrics. This method can be applied to a wide range of crystalline datasets where crystallographic information is not readily apparent from existing methods, and it helps to gain a deeper understanding of field evaporation behavior during atom probe experiments.
Article
Chemistry, Physical
Elena V. Bobruk, Maxim Yu. Murashkin, Ilnar A. Ramazanov, Vil U. Kazykhanov, Ruslan Z. Valiev
Summary: This study aims to achieve superplasticity of ultrafine-grained (UFG) Al 2024 alloy at temperatures lower than traditional commercial Al alloys. Complex tensile tests were conducted at various temperatures and strain rates, and the UFG alloy exhibited superplastic behavior at 240 and 270 degrees C. The UFG alloy also demonstrated higher strength compared to the standard strengthening heat treatment T6.
Article
Materials Science, Multidisciplinary
Andrew K. Hoffman, Yongfeng Zhang, Maalavan Arivu, Li He, Kumar Sridharan, Yaqiao Wu, Rinat K. Islamgaliev, Ruslan Z. Valiev, Haiming Wen
Summary: In nuclear reactor environments, nanocrystalline 304 stainless steel exhibits unique radiation-induced segregation behavior with the enrichment of Cr at grain boundaries. Lattice-based atomic kinetic Monte Carlo simulations reveal the influences of grain size, injected interstitials, and self-ion injection on grain boundary segregation.
Article
Materials Science, Multidisciplinary
Han Lin Mai, Xiang-Yuan Cui, Daniel Scheiber, Lorenz Romaner, Simon P. Ringer
Summary: This study investigates the segregation and co-segregation effects of phosphorus (P) and transition metal (TM) elements at grain boundaries (GBs) in steels. The findings reveal that while P alone is unlikely to cause intergranular fracture, its stronger segregation binding compared to TMs can explain its ubiquitous presence at GBs. The repulsive interactions and strong segregation binding of P deplete cohesion-enhancing solutes at general GBs and favor cohesion-lowering P-TM co-segregation combinations. These mechanisms contribute to P-induced temper embrittlement in alloyed steels and have significant implications for GB engineering.
Article
Materials Science, Multidisciplinary
Yong Chen, Hongmei Zhu, Pengbo Zhang, Zhongchang Wang, Meng Wang, Gang Sha, He Lin, Jingyuan Ma, Zhenyuan Zhang, Yong Song, Pengfei Zheng, Lihua Zhou, Sheng Li, Hao Liu, Longzhang Shen, Changjun Qiu
Summary: The effective strategy to enhance impurity tolerance in structural steel is to increase solidification rate. By using laser additive manufacturing, we successfully engineered C, N and O with high contents as interstitial atoms coordinated with Cr in the form of short-range ordered assembly, resulting in the development of an impurity-tolerant supersaturated austenitic stainless steel with high strength, good ductility, enhanced corrosion resistance, and acceptable thermal stability.
Article
Materials Science, Multidisciplinary
Zizheng Song, Ranming Niu, Xiangyuan Cui, Elena V. Bobruk, Maxim Yu. Murashkin, Nariman A. Enikeev, Ji Gu, Min Song, Vijay Bhatia, Simon P. Ringer, Ruslan Z. Valiev, Xiaozhou Liao
Summary: Superplastic deformation of polycrystalline materials is usually achieved by diffusion-assisted grain boundary sliding at high temperatures. Recent research has shown that room-temperature superplasticity can be achieved in ultrafine-grained Al-Zn based alloys, but the underlying mechanism is still unclear. This study utilized in-situ tensile straining, electron microscopy characterization, and atomistic density functional theory simulation to reveal that the superplasticity at room temperature is achieved by grain boundary sliding and grain rotation, facilitated by the continuous diffusion of Zn. The diffusion of Zn atoms from grains to grain boundaries forms a Zn nanolayer, acting as a solid lubricant to lower the energy barrier of grain boundary sliding.
Article
Multidisciplinary Sciences
Tingting Song, Zibin Chen, Xiangyuan Cui, Shenglu Lu, Hansheng Chen, Hao Wang, Tony Dong, Bailiang Qin, Kang Cheung Chan, Milan Brandt, Xiaozhou Liao, Simon P. P. Ringer, Ma Qian
Summary: This study demonstrates a series of titanium-oxygen-iron compositions with outstanding tensile properties, achieved through alloy design and additive manufacturing. These alloys, strengthened by the abundant elements of oxygen and iron, offer potential for diverse applications and the industrial-scale use of waste sponge titanium. Additionally, they have significant economic and environmental potential for reducing the carbon footprint of energy-intensive sponge titanium production.
Article
Mechanics
G. V. Klevtsov, L. R. Botvina, N. A. Klevtsova, R. Z. Valiev, I. N. Pigaleva
Summary: Fatigue failure is the most common type of failure in various engineering systems, and its study is crucial for predicting system's service life. The investigation of fatigue failure in new ultrafine-grained nanostructured metal materials is particularly interesting. This study demonstrates the possibility of determining the maximum cycle stress and cycle asymmetry coefficient from the depth of plastic zones beneath the surface of fatigue fractures.
PHYSICAL MESOMECHANICS
(2023)
Article
Multidisciplinary Sciences
Yangyang Liu, Can Li, Chunhui Tan, Zengxia Pei, Tao Yang, Shuzhen Zhang, Qianwei Huang, Yihan Wang, Zheng Zhou, Xiaozhou Liao, Juncai Dong, Hao Tan, Wensheng Yan, Huajie Yin, Zhao-Qing Liu, Jun Huang, Shenlong Zhao
Summary: The chlor-alkali process is important in the chemical industry due to the diverse usage of chlorine gas. However, current chlorine evolution reaction (CER) electrocatalysts have inefficiencies that result in high energy consumption. This study presents a highly active single-atom ruthenium catalyst for the electro synthesis of chlorine in seawater-like solutions. The catalyst exhibits low overpotential and high stability and selectivity, offering potential for efficient chlorine production from seawater.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Roman R. Valiev, Alexey V. Panin, Emil I. Usmanov, Yana N. Savina, Ruslan Z. Valiev
Summary: This study demonstrates for the first time the influence of high-pressure torsion (HPT) on microstructural refinement and mechanical strength of Ti-6Al-4V titanium alloy produced by wire-feed electron-beam additive manufacturing. HPT processing results in an ultrafine-grained (UFG) structure and significantly increases the microhardness of the alloy. Microscopic studies reveal that the UFG structure consists predominantly of alpha and beta phases.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
Xiyuan Zhang, Guisen Liu, Linfeng Jiang, Dian Jiao, Jimiao Jiang, Chun Chen, Zhiqiang Gao, Jialin Niu, Gang Sha, Yao Shen, Hua Huang, Guangyin Yuan
Summary: In this study, a Zn-2Cu-0.8Li alloy with both high strength and high ductility is developed via a unique hierarchical structure. The alloy consists of a hard beta-LiZn4 matrix, a soft eta-Zn phase, and dispersive epsilon-CuZn4 nanoprecipitates. The alloy exhibits excellent mechanical properties due to the unique microstructure and shows great potential for broader biomedical applications.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Xuzhou Gao, Wei Jiang, Yiping Lu, Zhigang Ding, Jizi Liu, Wei Liu, Gang Sha, Tongming Wang, Tingju Li, Isaac T. H. Chang, Yonghao Zhao
Summary: In this study, a face-centered cubic non-equiatomic Cr26Mn20Fe20Co20Ni14 high-entropy alloy with a low stacking fault energy was prepared and demonstrated excellent strength and ductility over a wide temperature range, including cryogenic temperatures. The microstructural analysis revealed different deformation mechanisms at different temperatures, contributing to the superior tensile properties at cryogenic temperatures. This study provides experimental evidence for the potential cryogenic applications of high-entropy alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Xiang Ding, Xiangyuan Cui, Li-Ting Tseng, Yiren Wang, Jiangtao Qu, Zengji Yue, Lina Sang, Wai Tung Lee, Xinwei Guan, Nina Bao, Ci Sathish, Xiaojiang Yu, Shibo Xi, Mark B. H. Breese, Rongkun Zheng, Xiaolin Wang, Lan Wang, Tom Wu, Jun Ding, Ajayan Vinu, Simon P. Ringer, Jiabao Yi
Summary: In this work, Ni/NiO nanocomposites were fabricated by depositing Ni and NiO thin layers alternately and annealing them at specific temperatures. It was found that the samples annealed at 473 K exhibited a significantly enhanced saturation magnetization exceeding 607 emu cm-3 at room temperature, surpassing that of pure Ni (480 emu cm-3). Material characterizations and density functional theory calculations confirmed that the NiO nanoclusters embedded in the Ni matrix were primarily responsible for the high magnetization, as they were ferromagnetically coupled with Ni.
Article
Microscopy
Levi Tegg, Andrew J. Breen, Siyu Huang, Takanori Sato, Simon P. Ringer, Julie M. Cairney
Summary: The CAMECA Invizo 6000 atom probe microscope utilizes unique ion optics, including dual antiparallel deep ultraviolet lasers, a flat counter electrode, and various lenses, to enhance the field-of-view without compromising the mass resolving power. This study demonstrates the performance of the Invizo 6000 through three material case studies, using both air and vacuum-transfer between instruments. The results show that the Invizo 6000 significantly improves the field-of-view compared to a LEAP 4000 X Si and enhances specimen yield, particularly for difficult samples like oxides.
Article
Materials Science, Multidisciplinary
Zhiheng Zhang, Hansheng Chen, Jiaying Jin, Bryan Lim, Xiaolian Liu, Wei Li, Mi Yan, Simon P. Ringer
Summary: This study presents a multi-main-phase Nd-Dy-Fe-B magnet with a Dy-lean core-Dy-rich shell microstructure, which exhibits high magnetic performance and thermal stability. The formation mechanism of the core-shell microstructure is explained through experimental and simulation analysis, highlighting the potential application of the magnet in large-scale production.
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.
