Article
Materials Science, Multidisciplinary
T. Nakata, C. Xu, S. Kamado
Summary: After cold-rolling an Mg-6Zn-0.3Ca alloy sheet with a strong basal texture, anomalous double twinning occurred with the (0001) pole aligned to the transverse direction. These twins served as nucleation sites for statically recrystallized grains during annealing, resulting in weak texture features in the annealed sheet with transverse-direction split (0001) poles.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Palash Chandra Maity, Narasimha Vinod Pulagara, K. N. Chaithanya Kumar, Indranil Lahiri, K. S. Suresh
Summary: The study demonstrates how to prevent the formation of strong cube texture on the surface of high-temperature annealed Ni foils subjected to large rolling reductions, while retaining the intensity of twin boundaries. The evolution of the surface texture of rolled and annealed foils is compared to conventional rolling, shear, and recrystallization texture components. The stability of the cube and ND-rotated cube components in rolled foils is discussed. Despite discontinuous recrystallization mechanisms, a significant fraction of rolling texture components is preserved after annealing. The suppression of the cube component is attributed to the constricted-annealing process and the activation of low-energy twin boundaries. Annealing twins are found to form through a growth fault mechanism during the recrystallization process.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Crystallography
Tomasz Tokarski, Grzegorz Cios, Dorota Moszczynska, Boguslawa Adamczyk-Cieslak, Milena Koralnik, Jaroslaw Mizera
Summary: In this study, single crystals of Cu-8.% at. Al were cold-drawn and the development of crystallographic texture during the drawing process was analyzed. The results showed significant crystal rotation and reorientation due to twinning, while maintaining general 4-fold symmetry around the drawing direction. Local texture analysis revealed that the original crystal was initially fragmented into four quadrants, but the central axis region retained the initial cubic orientation. Further deformation within dominant twinning systems led to additional fragmentation, dividing the crystal into sectors one eighth the size of the full circular cross-section.
Review
Materials Science, Multidisciplinary
Mahesh Panchal, K. R. Ravi, Lalit Kaushik, Rajesh Khatirkar, Shi-Hoon Choi, Jaiveer Singh
Summary: Magnesium alloys have gained great interest as the lightest structural metallic materials with high specific strength and stiffness. However, their poor formability at room temperature is a limitation for their structural applications. Various techniques, including microalloying, severe plastic deformation, thermomechanical processing, and pre-twinning/stretching, have been proposed to alter the crystallographic texture in magnesium alloys.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Jan Dittrich, Gergely Farkas, Daria Drozdenko, Michal Knapek, Kristian Mathis, Peter Minarik
Summary: A combination of advanced in-situ experimental techniques, including neutron diffraction, acoustic emission, and electron backscattered diffraction, was used to investigate the deformation behavior of magnesium alloys. The potential and limitations of these techniques were demonstrated in a study on the influence of crystallographic texture on deformation mechanisms in a hot-rolled sheet of the AZ31 alloy. The results showed the twinning activity and its evolution, as well as the deformed microstructure, providing valuable insights into the deformation mechanisms of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
H. Qiao, Y. Fu, X. C. Sun, H. Wang, D. Y. Li, Y. H. Peng, P. D. Wu
Summary: The orientation distribution of grains plays a decisive role in the performance of polycrystalline materials, especially those with low crystallographic symmetry. A reliable twinning model is essential for the design and service of zirconium alloys. In this study, two twinning models were implemented and evaluated, with the TDT model showing superior performance in predicting texture development.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Daniel J. Savage, Rodney J. McCabe, Marko Knezevic
Summary: This paper presents a set of algorithms for automatic reconstruction of deformation twin hierarchies in heavily twinned microstructures. By addressing key issues such as twin relationships, grain grouping, and constructing twin family trees, the automation level in reconstructing twin hierarchies under large strains is significantly improved.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Bin Wang, Yucheng Zhou, Liujie Xu, Dan Yang, Xiuqing Li, Shizhong Wei
Summary: Hot compression tests were conducted on Mo-1.5 wt% Al2O3/ZrO2 molybdenum alloys at various strain rates (0.01 s(-1)-5 s(-1)) and deformation temperatures (1000-1500 degrees C). The microstructural changes of the alloy were analyzed using EBSD. The presence of ZrO2 particles had a greater impact on improving the thermal deformation resistance compared to Al2O3 particles. The activation energy of the ZrO2-doped molybdenum alloy was lower than that of the Al2O3-doped alloy.
Article
Nanoscience & Nanotechnology
Gukin Han, Yeonju Noh, Umer Masood Chaudry, Sung Hyuk Park, Kotiba Hamad, Tea-Sung Jun
Summary: The study found that Mg-0.5Ca alloy exhibits temperature-insensitive hardening behavior, while pronounced twinning activity was observed in pure Mg when deformed at low temperatures. The microstructure of Mg-0.5Ca helps reduce twinning behavior, resulting in its hardening behavior being temperature-dependent.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Nicholas C. Ferreri, Zhangxi Feng, Daniel J. Savage, Donald W. Brown, Bjorn Clausen, Thomas A. Sisneros, Marko Knezevic
Summary: In this study, the deformation behavior of beryllium during compressive loading and cross-reloading is investigated using experimental measurements and crystal plasticity modeling. The comparison between experimental data and model predictions reveals that the shifts in active deformation mechanisms are primarily responsible for drastic changes in the flow stress.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Metallurgy & Metallurgical Engineering
Iniobong P. Etim, Wen Zhang, Yi Zhang, Lili Tan, Ke Yang
Summary: Compressive stress has a greater impact on the corrosion rate of Mg-2Zn-0.5Nd alloy compared to tensile stress, due to the introduction of dislocation slip and deformation twins which accelerate corrosion rate. Tension twinning and prismatic slip occur during tensile deformation, while basal slip and tension twinning occur during compressive deformation. Twinning activity increases with plastic strain, correlating with degradation rate.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Matti Lindroos, Napat Vajragupta, Janne Heikinheimo, Diogo Ribeiro Costa, Abhishek Biswas, Tom Andersson, Paer Olsson
Summary: A crystal plasticity model is proposed for modelling the mechanical behavior of polycrystalline UO2. The model includes a dislocation-density-based formulation with three slip families and their interactions. It is parametrized using single crystal and polycrystal experimental data and evaluated for yield point, strain hardening behavior, temperature and strain rate dependencies. The effect of porosity on homogenized macroscopic stress-strain behavior and stress/strain localization at the grain level is analyzed.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Nicolo M. Della Ventura, Szilvia Kalacska, Daniele Casari, Thomas E. J. Edwards, Amit Sharma, Johann Michler, Roland Loge, Xavier Maeder
Summary: The study of extension twinning mechanism in magnesium at the micron scale revealed that basal slip triggers {10(1) over bar2} twin nucleation and favors twin growth, while pyramidal slip leads to limited {10(1) over bar2} twin growth. The critical resolved shear stress for {10(1) over bar2} twinning was found to be ten times higher than in bulk material, indicating higher ductility in the tested samples.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Umer Masood Chaudry, Min-Su Lee, Tea-Sung Jun
Summary: This study systematically investigated the twin-induced dynamic recrystallization of commercially pure titanium under cryogenic and room temperature. The results showed that higher strain levels resulted in the increased evolution of twins and interactions between twins at room temperature, while cryogenic temperature led to significant grain refinement.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Hui Tian, Hongli Suo, Yaotang Ji, Xufeng Wang, Lin Ma, Lei Wang, Zili Zhang, Qiuliang Wang
Summary: This study systematically investigated the texture evolution of CuNi alloy fabricated by rolling and annealing processes with different von Mises strains using electron backscatter diffraction (EBSD). The samples with different strains all exhibited a strong cube texture after annealing at high temperatures, but the texture evolution trace was apparently affected by the strains. The recrystallization nucleation of the cube texture was found to be the most significant effect of the strain, causing a large temperature difference of 550-700 degrees C between samples with different strains.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Russell E. Marki, Kyle A. Brindley, Rodney J. McCabe, Marko Knezevic
Summary: This paper presents a mathematical procedure for invertible microstructure-property linkages for orthorhombic polycrystalline metals using the generalized spherical harmonics (GSH) spectral basis. The procedure allows for the computation of property closures and enables the simulation of microstructurally heterogeneous components under thermo-mechanical loadings in a computationally efficient manner. The developed framework has been demonstrated using alpha-uranium as a case study.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yifan Zhang, Jonathan G. Gigax, Thomas J. Nizolek, John S. Carpenter, Matthew M. Schneider, Nan Li, Laurent Capolungo, Rodney J. McCabe
Summary: Nano metallic laminates (NMLs) show exceptional strengths, but limited ductility under tension. By conducting mesoscale tension tests, it is found that annealing at 800 degrees C significantly enhances the ductility and work hardenability of NMLs.
Article
Materials Science, Multidisciplinary
Frank Niessen, Abhishek Bhattacharyya, Azdiar A. Gazder, Elena V. Pereloma, Ricardo A. Lebensohn
Summary: In this study, an integrated micromechanical modeling approach was presented to predict the available work from stress-induced martensite formation in Ti alloys. It was found that the tips of lamellar alpha were preferred nucleation sites for martensite formation, and the model could confidently predict the first variants forming at low levels of deformation.
Article
Materials Science, Multidisciplinary
Yifan Zhang, Nan Li, Matthew M. Schneider, Thomas J. Nizolek, Laurent Capolungo, Rodney J. McCabe
Summary: This study investigates the formation process and mechanism of kink band (KB) in Cu/Nb nano metallic laminates (NMLs). It is found that the inhomogeneous microstructure plays a key role in the formation of KB, leading to the accumulation of geometrically necessary dislocations (GNDs) and the formation of tilt geometrically necessary boundaries (GNBs) near KB boundaries (KBBs). Furthermore, once the layer-parallel slip systems are activated, preexisting lattice dislocations and dislocations nucleating from interfaces will accumulate as GNDs near KBBs, promoting the evolution of KB.
Article
Engineering, Mechanical
Zhangxi Feng, Reeju Pokharel, Sven C. Vogel, Ricardo A. Lebensohn, Darren Pagan, Eloisa Zepeda-Alarcon, Bjorn Clausen, Ramon Martinez, George T. Gray, Marko Knezevic
Summary: This paper presents crystallographically-based phase transformation models and deformation mechanism models for predicting strain-induced austenite to martensite transformation. The models can predict the strain-path sensitive, strain-rate and temperature sensitive deformation of stainless steels. The deformation of constituent grains is modeled as a combination of anisotropic elasticity, crystallographic slip, and phase transformation, while the hardening is based on the evolution of dislocation density and phase fractions. The models are calibrated and validated using experimental data and are used to simulate the deformation processes of stainless steel materials. The simulation results are compared and analyzed with experimental results in terms of geometry, mechanical response, phase fractions, and texture evolution.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Adnan Eghtesad, John D. Shimanek, Shun -Li Shang, Ricardo Lebensohn, Marko Knezevic, Zi-Kui Liu, Allison M. Beese
Summary: This study successfully integrates first-principles calculations based on density functional theory (DFT) into the dislocation density hardening law of the crystal plasticity fast Fourier transform (CPFFT) model, improving the robustness of the model and reducing the uncertainties in calibrating the macroscopic flow response.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Engineering, Multidisciplinary
R. Sancho, V. Rey-de-Pedraza, P. Lafourcade, R. A. Lebensohn, J. Segurado
Summary: An FFT-based algorithm is proposed to simulate the propagation of elastic waves in heterogeneous domains. The method incorporates the application of Dirichlet boundary conditions and uses a stable beta-Newmark approach for time discretization. By solving the equilibrium equations in Fourier space and employing a preconditioned Krylov solver, the method achieves high accuracy and computational efficiency. Numerical examples demonstrate its effectiveness in simulating wave propagation in different mediums.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Miroslav Zecevic, Ricardo A. Lebensohn, Laurent Capolungo
Summary: This paper presents a new formulation and numerical implementation of a strain-gradient crystal plasticity model within a large-strain elasto-viscoplastic fast Fourier transform-based micromechanical model. The model is used to study the formation of kink bands during layer-parallel compression of nano-metallic laminates. The interaction between dislocations and interfaces is considered in the model to accurately simulate the behavior of the layered composites.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
C. K. Cocke, H. Mirmohammad, M. Zecevic, B. R. Phung, R. A. Lebensohn, O. T. Kingstedt, A. D. Spear
Summary: This study extends a large-strain FFT-based crystal plasticity model to simulate ductile fracture of polycrystalline materials. By incorporating a triaxiality-based continuum damage mechanics (CDM) formulation into a large-strain elasto-viscoplastic FFT (LS-EVPFFT) framework and using an integral-based nonlocal regularization approach, the model is able to accurately predict the macroscopic stress-strain response and necking behavior of ductile polycrystals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Multidisciplinary
Valentin Gallican, Miroslav Zecevic, Ricardo A. Lebensohn, Martin I. Idiart
Summary: Approximations for the elastic properties of dilute solid suspensions with imperfect interfacial bonding are derived and assessed. Two approximations are generated using a variational procedure, with one dependent on an arithmetic mean and the other dependent on a harmonic mean for averaging the interfacial compliance. The harmonic approximation is found to be more accurate than the arithmetic approximation, which has practical relevance given the widespread use of the latter in existing descriptions.
JOURNAL OF ELASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Aritra Chakraborty, Ricardo A. Lebensohn, Laurent Capolungo
Summary: At moderate-to-high temperatures and below the yield strength, the inelastic deformation of metals is mainly controlled by vacancy diffusion-mediated processes. Vacancies (or atoms) can diffuse preferentially along grain boundaries or along dislocations, resulting in climb and self-climb. The proposed thermodynamically-consistent model considers the coupling between grain boundary and grain bulk diffusion-mediated plasticity mechanisms and predicts the strain rate dependencies and steady-state creep rate scaling with respect to grain size, temperature, and stress.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Yifan Zhang, Miroslav Zecevic, Aritra Chakraborty, Rodney J. McCabe, Thomas J. Nizolek, Ricardo A. Lebensohn, John S. Carpenter, Nan Li, Laurent Capolungo
Summary: This study investigates the dependence of kinking on microstructural attributes in NMLs through in situ micropillar compression, microstructure characterization, simulations, and modeling. The development of internal stresses during loading activates local layer-parallel glide triggering kinking in NMLs. The effect of key microstructural features on kink band formation in NMLs is also revealed.
Article
Engineering, Mechanical
Adnan Eghtesad, Qixiang Luo, Shun -Li Shang, Ricardo A. Lebensohn, Marko Knezevic, Zi-Kui Liu, Allison M. Beese
Summary: This study combines a full-field crystal plasticity model with a first principles-informed dislocation density hardening law and a machine learning approach to investigate the microstructural features correlated with micromechanical field localization in polycrystalline Ni. The results show that regions near grain boundaries, higher Schmid factors, low slip transmissions, and high intergranular misorientations are more prone to being micromechanical hotspots. The integration of physics-based crystal plasticity with machine learning provides insights into the initiation zones of micromechanical damage in polycrystalline metals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Physical
Dongil Shin, Ryan Alberdi, Ricardo A. Lebensohn, Remi Dingreville
Summary: Recent developments in micromechanics and neural networks have provided promising paths for accurately predicting the response of heterogeneous materials. The deep material network, with its multi-layer design and trained micromechanics building blocks, offers the ability to extrapolate material behavior to different constitutive laws without retraining. However, the random initialization of network parameters in current training methods leads to unavoidable errors. In this study, we propose a visualization technique using an analogous unit cell to initialize deeper networks and improve the accuracy and calibration performance, while also providing a more intuitive representation of the network for explainability.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Geography, Physical
Maria-Gema Llorens, Albert Griera, Paul D. Bons, Ilka Weikusat, David J. Prior, Enrique Gomez-Rivas, Tamara de Riese, Ivone Jimenez-Munt, Daniel Garcia-Castellanos, Ricardo A. Lebensohn
Summary: This study investigates the influence of ice deformation history on the development of crystallographic preferred orientations (CPOs) using full-field numerical simulations. The results show that the second deformation event tends to destroy the first inherited fabric, but the transition is slow when crystallographic axes are critically oriented with respect to the second imposed regime. Therefore, caution must be exercised when interpreting observed CPOs in areas with complex deformation histories.
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.
