Article
Materials Science, Multidisciplinary
Xingxing Li, Xinghai Yang, Chengpeng Xue, Shuo Wang, Yuxuan Zhang, Bing Wang, Junsheng Wang, Peter D. Lee
Summary: In this study, a three-dimensional multicomponent cellular automaton (CA) model coupled with CALPHAD calculations was used to simulate the nucleation and growth of hydrogen porosity and its interaction with surrounding dendritic structures during the solidification of Al-Cu-Li alloys. The effects of hydrogen concentration, cooling rate, and Li content on solidification conditions were quantified, resulting in effective reduction of porosity size. X-ray computed tomography (XCT) was utilized to validate the model and revealed that porosity exhibited elongated and tortuous shape at slow cooling rates, filling up the empty spaces of secondary arms, while it tended to be dispersed spherical shape at high cooling rates when its surrounding grains became equiaxed structures.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Y. Fu, H. Fang, F. Monaco, P. Cloetens, F. D. Tichelaar, J. G. van Meel, E. Bruck, S. van der Zwaag, N. H. van Dijk
Summary: The self-healing of grain-boundary cavities by both Au-rich and W-rich precipitates in a high-purity Fe-3Au-4W ternary alloy at 550 degrees C was studied through constant stress creep experiments. The healing kinetics strongly depends on the nucleation time of the cavities, with early-nucleated cavities fully healing and late-nucleated cavities showing slower healing rates.
Article
Electrochemistry
Natasa M. Vukicevic, Vesna S. Cvetkovic, Niko Jovicevic, Jovan N. Jovicevic
Summary: The study found that aluminium can underpotentially deposit onto palladium from AlCl3+NaCl melts, resulting in the synthesis of AlPd and Al3Pd4 alloys under certain conditions. The surface alloys synthesized are well adhering, microcrystalline deposits suitable for applications like hydrogen purification filters.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2021)
Article
Crystallography
Ya-Le Tao, Zhen Jiao, Zheng-Tang Liu, Cheng-Lu Jiang, Qi-Jun Liu
Summary: A new method using a light-gas gun to synthesize Nb-Al alloys has been proposed, and successful synthesis of high-temperature structural materials has been achieved. X-ray diffraction and simulation have been used to clarify the structural characteristics of the alloys, and the best candidate material has been determined.
Article
Materials Science, Multidisciplinary
Ziyi Wang, Shengchuan Wu, Guozheng Kang, Hang Li, Zhengkai Wu, Yanan Fu, Philip J. Withers
Summary: This paper elucidates the relationship between primary deformation processes and damage mechanisms in an extruded AZ31 Mg alloy under low-cycle fatigue with ratchetting. Different deformation modes were characterized by twins/detwins, twins/detwins and slip, and slip dominated cyclic deformations. Profuse twins were found in TDD and TDSD samples, while the TDSD sample had the most damage initiation sites. Shear linkage between isolated cracks was observed only in the TDSD sample, providing evidence for modeling damage evolution in extruded Mg alloys.
Article
Materials Science, Multidisciplinary
Chi Zhang, Chen Liu, Xin Li, Keli Liu, Guangyuan Tian, Junsheng Wang
Summary: The corrosion of Mg multicomponent alloys is closely related to secondary phases. X-ray tomography (XCT) has been used to study the correlation between corrosion and secondary phases in traditional AZ91 alloy and newly developed Mg-10Gd-5Dy-0.2Zr alloy. The changes of corrosion morphology with time and the effects of different secondary phases on corrosion have been analyzed.
Article
Chemistry, Physical
Peter Staron, Andreas Stark, Norbert Schell, Petra Spoerk-Erdely, Helmut Clemens
Summary: Intermetallic gamma-TiAl-based alloys are lightweight materials suitable for high temperature applications, capable of replacing heavier Ni-based alloys. These alloys consist of three crystallographic phases that transform into each other at different temperatures.
Article
Chemistry, Physical
Jonathan W. Pegues, Michael A. Melia, Mark A. Rodriguez, Tomas F. Babuska, Benjamin Gould, Nicolas Argibay, Aaron Greco, Andrew B. Kustas
Summary: The study utilized laser beam directed energy deposition to explore the composition space of a graded W-x(CoCrFeMnNi)(100-x) sample and found the formation of the Fe7W6 intermetallic phase and non-incorporated W particles at certain concentrations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Przemyslaw Kwolek, Grazyna Mrowka-Nowotnik, Magdalena Wytrwal-Sarna
Summary: The study shows that the corrosion rate of aluminum alloy 2017 significantly decreases in solutions containing heteropolyoxomolybdate species. However, solutions containing heteropolyoxotungstate do not inhibit the corrosion of the alloy, while solutions containing vanadium species are unstable over time.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2021)
Article
Chemistry, Physical
Adam Debski, Sylwia Terlicka, Anna Sypien, Wladyslaw Gasior, Magda Peska, Marek Polanski
Summary: This study investigates the hydrogen sorption properties of casted Ag-Mg alloys and finds that samples with high magnesium content readily absorb significant amounts of hydrogen, while no hydrogen absorption is observed for samples with high silver concentrations.
Article
Chemistry, Physical
Julien Gonthier, Tilman Rilling, Ernesto Scoppola, Fabian Zemke, Aleksander Gurlo, Peter Fratzl, Wolfgang Wagermaier
Summary: This study used in operando X-ray micro-computed tomography (mu CT) to monitor the progression of the liquid, gaseous, and solid phases of silica gels during ambient pressure drying and spring-back. The findings challenge the common assumption about the penetration of gas during the spring-back effect and show that the emergence of the spring-back effect is correlated to an equal volume fraction of solid, liquid, and gas in the gels.
CHEMISTRY OF MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Ewan Lordan, Yijie Zhang, Kun Dou, Alain Jacot, Chrysoula Tzileroglou, Paul Blake, Zhongyun Fan
Summary: This article reveals the probabilistic nature of high-pressure die casting, specifically addressing the scatter in the tensile ductility of die-cast Al8Si0.4Mn0.3Mg alloy. The study shows that reducing heat loss in the shot chamber can lead to a more homogeneous grain structure, resulting in a decrease in maximum pore size and an increase in minimum tensile ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Jakub Hajkowski, Robert Sika, Michal Rogalewicz, Pawel Popielarski, Waldemar Matysiak, Stanislaw Legutko
Summary: The paper discusses the scope and usefulness of predicting crystalline structure of castings using Calcosoft CAFE system, and validates it through experiment-simulation. It emphasizes the importance of reliable material database and a comprehensive approach to modeling structure formation. The study extends the database content, generalized the correlation of simulation results on micro- and macroscale, and determines the impact of individual parameters on structure formation.
Article
Materials Science, Multidisciplinary
Shikang Feng, Enzo Liotti, Andrew Lui, Matthew D. Wilson, Patrick S. Grant
Summary: Experimental observations reveal that the nucleation process of the Pt-rich intermetallic compound crystals exhibits distinct cascades or waves, which increase with changing cooling rate and thermal gradient in the melt. Nucleation mainly occurs on the most potent TiB2 particles, accounting for approximately 0.5% of the total number density.
Article
Chemistry, Physical
Zeliang Su, Etienne Decenciere, Tuan-Tu Nguyen, Kaoutar El-Amiry, Vincent De Andrade, Alejandro A. Franco, Arnaud Demortiere
Summary: The segmentation of tomographic images of battery electrode is crucial for material characterization and electrochemical simulation. We propose a deep learning approach using a CNN for real-world battery material datasets, achieving high accuracy with limited labeled data. We also address the uncertainty in the segmentation quality by identifying human bias in the training data.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Enamul Haque Mojumdar, Lone Bruhn Madsen, Henri Hansson, Ida Taavoniku, Klaus Kristensen, Christina Persson, Anna Karin Moren, Rajmund Mokso, Artur Schmidtchen, Tautgirdas Ruzgas, Johan Engblom
Summary: Proper skin barrier function is crucial for survival, and restoring the lost barrier to prevent chronic wounds is of acute importance. While rapid wound closure may be more important than immediate perfection of the barrier, specific treatments can help to improve it. Molecular investigations revealed patterns of keratin organization and lipid formations in the stratum corneum that may impact barrier recovery and fluidity in regenerated tissue. This molecular approach could be valuable for future development of wound healing products.
Article
Multidisciplinary Sciences
Maria Pierantoni, Isabella Silva Barreto, Malin Hammerman, Lissa Verhoeven, Elin Tornquist, Vladimir Novak, Rajmund Mokso, Pernilla Eliasson, Hanna Isaksson
Summary: Using phase-contrast enhanced synchrotron micro-tomography, researchers can capture the complex 3D organization of Achilles tendon microstructure despite the influence of various factors on image quality. The study suggests that traditional invasive sample preparations like fixation and embedding are not necessary for studying tendon collagen fibers. Instead, high-quality images capturing the complex 3D organization of tendon fibers can be obtained from fresh frozen samples in conditions close to natural.
SCIENTIFIC REPORTS
(2021)
Article
Robotics
Florent Hannard, Mohammad Mirkhalaf, Abtin Ameri, Francois Barthelat
Summary: Fish fins do not have muscles but can change shape with high precision and speed to produce hydrodynamic forces. Stiffening and segmented structures in fish fins play a critical role in providing high flexural stiffness and morphing amplitude. Designs inspired by fish fins may provide robotic materials with large morphing amplitudes and strong grasping forces.
Article
Materials Science, Multidisciplinary
Morgane Mokhtari, Christophe Le Bourlot, Jerome Adrien, Anne Bonnin, Wolfgang Ludwig, Pierre-Antoine Geslin, Takeshi Wada, Jannick Duchet-Rumeau, Hidemi Kato, Eric Maire
Summary: A liquid metal dealloying mechanism was investigated in situ using X-ray tomography and X-ray diffraction, showing selective dissolution of Ni atoms into a molten Mg bath and rearrangement of FeCr atoms. The final structure obtained was a bicontinuous FeCr phase with a solid solution of Ni in Mg, achieved through a final etching step. X-ray tomography reconstruction was used to measure 3D dealloying and etching kinetics, while X-ray diffraction patterns analyzed the evolution of relative strain during the process, with different behaviors observed depending on the precursor composition.
Article
Mechanics
C. Breite, A. Melnikov, A. Turon, A. B. de Morais, C. Le Bourlot, E. Maire, E. Schoberl, F. Otero, F. Mesquita, I Sinclair, J. Costa, J. A. Mayugo, J. M. Guerrero, L. Gorbatikh, L. N. McCartney, M. Hajikazemi, M. Mehdikhani, M. N. Mavrogordato, P. P. Camanho, R. Tavares, S. M. Spearing, S. Lomov, S. Pimenta, W. Van Paepegem, Y. Swolfs
Summary: This study experimentally validated blind predictions of six state-of-the-art models on the longitudinal tensile failure of unidirectional fibre-reinforced composites. It was found that models without major conservative assumptions regarding stress redistributions around fibre breaks tend to overestimate failure strains and strengths, while models with at least one such assumption showed better agreement for these properties. The study also revealed that all models failed to accurately predict the development of fibre break (and cluster).
COMPOSITE STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Matthieu B. Lezaack, Florent Hannard, Aude Simar
Summary: 7475 Al alloy can achieve improved fracture toughness through FSP, but it does not improve crack propagation resistance compared to T6 rolled material. This study reveals the competing effects of FSPed microstructure on crack initiation and propagation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Multidisciplinary Sciences
C. Breite, A. Melnikov, A. Turon, A. B. de Morais, C. Le Bourlot, E. Maire, E. Schoberl, F. Otero, F. Mesquita, I. Sinclair, J. Costa, J. A. Mayugo, J. M. Guerrero, L. Gorbatikh, L. N. McCartney, M. Hajikazemi, M. Mehdikhani, M. N. Mavrogordato, P. P. Camanho, R. Tavares, S. M. Spearing, S. V. Lomov, S. Pimenta, W. Van Paepegem, Y. Swolfs
Summary: In-situ tensile tests were conducted on two carbon fibre/epoxy composites, with reconstructions of voxel images containing information on fibre breaks and cluster development. The data were compared against predictions from six strength models, serving as a benchmark for the development of new models.
Article
Materials Science, Multidisciplinary
Matthieu B. Lezaack, Florent Hannard, Lv Zhao, Andrey Orekhov, Jerome Adrien, Arttu Miettinen, Hosni Idrissi, Aude Simar
Summary: This study successfully improved the ductility of 7475 Al alloy through friction stir processing and subsequent heat treatments, resulting in a 180% increase in fracture strain. These findings are paving the way for better formability and crashworthiness of 7XXX alloys.
Article
Multidisciplinary Sciences
Joni Kemppainen, Ben Scales, Keivan Razban Haghighi, Jouni Takalo, Neveen Mansour, James McManus, Gabor Leko, Paulus Saari, James Hurcomb, Andra Antohi, Jussi-Petteri Suuronen, Florence Blanchard, Roger C. Hardie, Zhuoyi Song, Mark Hampton, Marina Eckermann, Fabian Westermeier, Jasper Frohn, Hugo Hoekstra, Chi-Hon Lee, Marko Huttula, Rajmund Mokso, Mikko Juusola
Summary: This study reveals the neural mechanisms behind superresolution three-dimensional vision in fruit flies, which may have implications for animals, robots, and sensors.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Mariia Arseenko, Florent Hannard, Lipeng Ding, Lv Zhao, Eric Maire, Julie Villanova, Hosni Idrissi, Aude Simar
Summary: Self-healing strategies for metallic systems are still under-developed, but this study proposes a new strategy based on damage localization particles that can be healed by heat treatment. The strategy was successfully validated with a commercial aluminum alloy, showing that short and low temperature heating can repair micron-sized damage.
Article
Chemistry, Physical
Leo Thiercelin, Sophie Cazottes, Aurelien Saulot, Frederic Lebon, Florian Mercier, Christophe Le Bourlot, Sylvain Dancette, Damien Fabregue
Summary: This study conducted monotonic and cyclic shear tests using hat-shaped specimens in the temperature range of 20 degrees C to 400 degrees C to simulate the formation of WEL. The material showed a strong sensitivity to temperature, but it did not necessarily favor WEL formation.
Article
Multidisciplinary Sciences
Carlos Benitez Villanueva, Hans J. T. Stephensen, Rajmund Mokso, Abdellatif Benraiss, Jon Sporring, Steven A. Goldman
Summary: This study investigates the relationship between astroglial cells and medium spiny neurons (MSN) synapses in Huntington's disease (HD). The results show that HD astrocytes have impaired connection and function with synaptic sites compared to normal astrocytes, leading to striatal hyperexcitability and the development of HD.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Physical
Sutao Han, Matthieu B. Lezaack, Grzegorz Pyka, Nelson Netto, Aude Simar, Magd Abdel Wahab, Florent Hannard
Summary: The 7xxx series aluminium alloys exhibit exceptional strength but are prone to precipitate-free zones (PFZs) along grain boundaries, leading to intergranular fracture and low ductility. This study investigates the competition between intergranular and transgranular fracture in the 7075 Al alloy, which has implications for the formability and crashworthiness of thin Al sheets. Friction Stir Processing (FSP) is used to generate and study microstructures with similar hardening precipitates and PFZs but different grain structures and intermetallic (IM) particle sizes. Experimental results show that the microstructure significantly affects tensile ductility and formability in different ways.
Article
Engineering, Biomedical
Saurabh Das, Florent Hannard, Francois Barthelat
Summary: Researchers conducted micromechanical tests on individual rays from Rainbow trout to study the mechanical behavior of rays under large deformations, resulting in a mechanical model that captures the behavior and providing new insights into the design of efficient bioinspired stiff morphing materials and structures at large deformations.
ACTA BIOMATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Aram Bahmani, J. William Pro, Florent Hannard, Francois Barthelat
Summary: This study examines the assembly process and mechanisms of hard cubic grains using vibration as a potential method for rapid fabrication of structured materials. The results show that the acceleration normalized by gravity cannot fully capture the phase transitions or the mechanisms governing cubes packing and that amplitude and frequency must be considered independently. Cube rotation and bouncing play crucial roles in the assembly process.
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.
