Article
Mechanics
Otmar Kolednik, Masoud Sistaninia, Stefan Kolitsch
Summary: This paper presents a modified procedure for J-integral testing on micro-scale cantilever beam specimens. The study determines the plastic eta-factor, eta pl, for the cantilever beam specimens as a function of the relative crack length, relative cantilever length, relative base distance, and load. The results indicate that the constant value of eta pl 2 is only applicable for longer crack lengths, and for smaller crack ratios, eta pl can be much smaller and dependent on the base distance ratio. A fitting procedure is proposed to determine the correct value of eta pl and modifications to the J-integral testing procedure for cantilever beam specimens are suggested. A numerical validation of the procedure is also provided.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
J. Dong, J. Shen, Y. H. Sun, H. B. Ke, B. A. Sun, W. H. Wang, H. Y. Bai
Summary: The study found that the torsion fracture of metallic glasses may deviate from the circumferential shear plane, and the fracture angle is closely related to the composition and size, showing an intrinsic relationship between fracture mechanism and fracture toughness in MGs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Keita Nomoto, Bosong Li, Christoph Gammer, Anna Ceguerra, Huma Bilal, Anton Hohenwarter, Jurgen Eckert, Bernd Gludovatz, Simon P. Ringer, Jamie J. Kruzic
Summary: This study uses nanobeam electron diffraction to reveal the structural changes that occur after deformation in two Zr-based bulk metallic glasses (BMGs). The findings show that heavy deformation leads to an increase in the size of fcc-like medium-range order (MRO) clusters, resulting in local softening of the BMGs.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Keita Nomoto, Anna Ceguerra, Christoph Gammer, Bosong Li, Huma Bilal, Anton Hohenwarter, Bernd Gludovatz, Jurgen Eckert, Simon P. Ringer, Jamie J. Kruzic
Summary: The study revealed the hierarchical structure of BMGs through nanobeam electron diffraction experiments, showing that the local hardness of microscale domains decreases with the size and volume fraction of atomic clusters with higher local MRO. A model of ductile phase softening was proposed to enable the design of BMGs in the future by tuning the MRO size and distribution in the nanostructure.
Article
Multidisciplinary Sciences
Yao Tang, Haofei Zhou, Haiming Lu, Xiaodong Wang, Qingping Cao, Dongxian Zhang, Wei Yang, Jian-Zhong Jiang
Summary: By adjusting processing conditions, controllable structural gradients can be designed in bulk metallic glasses, resulting in enhanced plasticity and suppression of shear localization.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yinxia Zhang, Matthias Bartosik, Steffen Brinckmann, Subin Lee, Christoph Kirchlechner
Summary: Focused ion beam (FIB) milling is commonly used for micromechanical testing, but it can introduce artifacts that affect the obtained mechanical properties. A bridge notch geometry was proposed as a strategy to reduce FIB-induced artifacts over a decade ago, but its experimental observation and quantification have not been realized until now. This study presents the first experimental observation of bridge notch failure and crack arrest, providing more accurate fracture toughness values.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Ceramics
Josef Schlacher, Tamas Csanadi, Marek Vojtko, Roman Papsik, Raul Bermejo
Summary: The enhanced fracture resistance of textured alumina is attributed to crack deflection along grain boundaries. This study quantifies and compares the micro-scale fracture toughness of textured alumina grains and grain boundaries using micro-bending tests and finite element analysis. The results show that the micro-scale fracture toughness of the textured alumina grain boundaries is about 30% lower than that of the grains. These findings are crucial for understanding the macroscopic fracture behavior of textured alumina ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Review
Materials Science, Multidisciplinary
Cheng Zhang, Di Ouyang, Simon Pauly, Lin Liu
Summary: Bulk metallic glasses (BMGs) as metallic materials without long-range order have attracted significant attention from academia and industry in the past three decades. The emerging 3D printing technology provides a viable route to overcome the challenges inherent in conventional processing routes and expand the applications of BMGs.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Wook Ha Ryu, Ji Young Kim, Eun Soo Park
Summary: Studies have been conducted to investigate the mechanical characteristics of bulk metallic glasses (BMGs) in order to replace conventional alloys. One ongoing issue is the variation in key properties such as fracture toughness due to the manufacturing process. This article discusses the fracture behavior of BMGs in relation to Griffith's theory and reviews studies on how intrinsic and extrinsic factors affect the brittle-ductile transitions in BMGs.
Article
Computer Science, Interdisciplinary Applications
Fuzuli Agri Akcay, Erkan Oterkus
Summary: Fracture toughness is a crucial parameter in designing and manufacturing structural engineering components. Accurate measurement of fracture toughness can be challenging, especially in extremely brittle or tough materials. A physics-based analytical expression using a uniaxial tensile test specimen is proposed to determine fracture toughness of isotropic materials, and the predicted values are in good agreement with experimental measurements.
ENGINEERING WITH COMPUTERS
(2023)
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
Nanoscience & Nanotechnology
H. Zhang, Z. Wang, H. J. Yang, X. H. Shi, P. K. Liaw, J. W. Qiao
Summary: Based on microscopic mechanisms, a constitutive equation for crack-like propagation velocity and a flow model for bulk metallic glasses (BMGs) are derived. The model explains the fundamental deformation of BMGs and accurately predicts the transition between serrated and non-serrated flows. The results are consistent with experimental data, providing a theoretical basis for plastically processing BMGs.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Yang Han, Zejian Xu, Wang Dou, Changzeng Fan, Bing Hou, Xiaodong He, Yan Liu, Fenglei Huang
Summary: This study presents a novel experimental technique to determine the dynamic fracture toughness of bulk metallic glasses at high loading rates. The results show that the loading rate does not significantly affect the fracture toughness, but decreases the fracture initiation time. The fracture surface exhibits different regions with distinct failure modes and micromechanisms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Limin Lai, Tianhao Liu, Xinghong Cai, Min Wang, Shengbiao Zhang, Wen Chen, Shengfeng Guo
Summary: The study introduces a series of low-cost refractory Mo-Co-B BMGs with enhanced GFA and high thermal stability, exhibiting exceptional hardness and Young's modulus.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
M. Bentoumi, E. H. Raouache, Z. Driss, A. Montagne, A. Iost, A. Mejias, D. Chicot
Summary: Instrumented indentation testing is commonly used to evaluate the mechanical properties of materials, particularly for brittle materials prone to cracking during indentation. The pop-in phenomenon, observed in multicyclic loading tests, can be used to characterize the cracking resistance of the materials. Indentation fracture toughness (KIc) can be calculated from crack length measurements to compare the resistance to cracking of different materials.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Alexander Jelinek, Stanislav Zak, Markus Alfreider, Daniel Kiener
Summary: Direct laser writing by two-photon lithography enables the manufacturing of tailored 3D objects with high precision. Mechanical properties of materials can be accessed through micromechanical testing. This study presents an approach to overcome the issue of undefined geometries by introducing a slight taper within the geometry at initially printed layers.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Benjamin Seligmann, Markus Alfreider, Michael Wurmshuber, Daniel Kiener
Summary: Microelectronic devices require material systems combining multiple layers of material for proper operation. This study investigates the internal stress states and their influence on deformation behavior in a Si-WTi-Cu material system using in situ thermomechanical cantilever bending experiments. The experiments reveal that the Cu layer undergoes partial plastic deformation during heating, which may result in failure of devices. A model incorporating plastic deformation and known residual stresses is proposed and verified by Finite Element Analysis to assess the internal stress and strain states based on in situ observation.
ADVANCED ENGINEERING MATERIALS
(2023)
Editorial Material
Chemistry, Multidisciplinary
Juergen Eckert, Daniel Kiener
Article
Engineering, Biomedical
Michael Wurmshuber, Jana Wilmers, Jongil Kim, Sang Ho Oh, Swantje Bargmann, Daniel Kiener
Summary: The limpet tooth is considered as the strongest material in nature, with a reported strength value of up to 6.5 GPa. The recent discovery of microscale auxeticity in the tooth's leading part provides a possible explanation for this extreme strength. Through micromechanical experiments, it is found that the hardness values obtained from nanoindentation are lower than the strength observed in micropillar compression tests. This unique behavior is attributed to local tensile strains during indentation, resulting from the microscale auxeticity, leading to microdamage in the auxetic regions of the tooth microstructure.
ACTA BIOMATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Michael Wurmshuber, Markus Alfreider, Stefan Wurster, Michael Burtscher, Reinhard Pippan, Daniel Kiener
Summary: The brittleness of tungsten is a challenge for its application as a divertor material in nuclear fusion reactors. Grain refinement is a promising strategy to increase its fracture toughness, but it also promotes intercrystalline crack growth. This study explores the use of grain boundary doping with boron and hafnium to enhance the fracture toughness of ultrafine-grained tungsten. The results show that doping with boron and hafnium can improve the fracture toughness of ultrafine-grained tungsten, with values up to 27 MPa root m.
Article
Materials Science, Multidisciplinary
T. Kluensner, M. Krobath, R. Konetschnik, C. Tritremmel, V. Maier-Kiener, D. Samardzic, W. Ecker, C. Czettl, C. Mitterer, D. Kiener
Summary: In this study, micromechanical specimens were produced using focused ion beam milling to investigate the fracture behavior of rough substrate-coating interfaces with complex defect structure. It was found that a stable value of the maximum principal stress triggering fracture in the ceramic-ceramic interfaces was observed for inclination angles >= 45 degrees. The interface strength was determined by observing the crack path at the substrate-coating interface via scanning electron microscopy and analyzing the effectively loaded interface area values.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Markus Alfreider, Michael Meindlhumer, Tobias Ziegelwanger, Rostislav Daniel, Jozef Keckes, Daniel Kiener
Summary: Nanostructured materials play a key role in various modern applications. For instance, hard and wear-resistant metal nitride coatings are essential in industrial dry-milling processes to protect cutting tools. However, improving the dynamical properties of these nanostructured thin films is challenging due to difficulties in probing parameters of (sub-)micron layers without substrate influence. To address this issue, a novel method called micromechanical spectroscopy (mu MS) based on resonance peak measurements of a cantilever-transducer system is developed and applied to an Al0.8Cr0.2N model system. The research reveals the precipitation of cubic CrN and local Cr variations in the wurtzite-type supersaturated Al0.8Cr0.2N system after annealing at 1050 degrees C, resulting in a 63 percent increase in damping capability and a 36 percent increase in Young's modulus.
Article
Chemistry, Physical
Gloria Graf, Malina Seyffertitz, Petra Spoerk-Erdely, Helmut Clemens, Andreas Stark, Lukas Hatzenbichler, David Holec, Michael Burtscher, Daniel Kiener, Xiaobing Li, Kui Liu
Summary: In order to promote the use of intermetallic γ-TiAl based alloys in the aircraft and automotive sector, recent research has focused on the development of low-cost titanium aluminides. The addition of manganese has shown potential to replace more expensive alloying elements and improve the ductility. However, Mn-containing alloys are prone to the formation of undesired brittle phases, which can affect the ductility. This study investigated the transformation kinetics and stability range of a specific brittle phase in a low-cost Ti-42Al-5Mn alloy using experimental and computational approaches. The results provide valuable insights for the future design of low-cost γ-TiAl based alloys.
Article
Materials Science, Multidisciplinary
Alexander Jelinek, Stanislav Zak, Megan J. Cordill, Daniel Kiener, Markus Alfreider
Summary: Two-photon lithography enables the design and characterization of novel micromechanical specimens, expanding the possibilities for miniaturized technologies. This study presents a methodology for automated specimen fabrication and testing, and analyzes the influence of parameters on the essential work of fracture. The findings provide a foundation for statistical fracture evaluation in other resin materials and thin film systems.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Michael Burtscher, Markus Alfreider, Christina Kainz, Daniel Kiener
Summary: The technical potential of WCu alloys is limited by the modest fracture characteristics of the material system in its coarse-grained condition. To address this, a W-50 at.% Cu composite with a nanocrystalline microstructure was processed using high-pressure torsion deformation. The resulting microstructures were quantified, and the mechanical properties were investigated. The study found that the processed specimens had smaller grain sizes and increased amount of mechanically intermixed W in the Cu grains. The mechanical properties of the processed specimens were comparable to those of the coarse-grained specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nuclear Science & Technology
Alexander J. Leide, Thomas A. Haynes, Nassia Tzelepi, John Payne, Matthew Jordan, Steven Knol, Jan A. Vreeling, Mark Davies, David T. Goddard, Manuel J. Pfeifenberger, Markus Alfreider, Daniel Kiener, Dong Liu
Summary: This study applies FIB-DIC analysis to evaluate the residual stresses in coated fuel particles, specifically in the pyrolytic carbon and silicon carbide layers. The findings indicate the existence of tensile residual hoop stresses in the pyrolytic carbon layers and compressive residual hoop stress in the silicon carbide layer. These stresses, which were not accounted for in previous models, are comparable to the stresses predicted in real fuel particles.
NUCLEAR MATERIALS AND ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Daniel Kiener, Amit Misra
Summary: This article provides an overview of recent developments in test methodologies for nanoindenter-based small-length-scale mechanical characterization. It emphasizes the possibilities offered by in situ testing in transmission and scanning electron microscopes, as well as the examination of strain rate and temperature dependence of mechanical strength. The versatility and growing impact of new nanomechanical characterization tools are highlighted through selected recent examples.
Article
Materials Science, Multidisciplinary
Lukas Schweiger, Daniel Kiener, Michael Burtscher, Erhard Schafler, Gregor Mori, Florian Spieckermann, Juergen Eckert
Summary: A bulk nanocomposite with a FeTi-Cu composition was prepared using high-pressure torsion, and satisfactory microstructural homogeneity was achieved at high temperatures due to self-reinforcement. However, processing at room temperature remained challenging.
MATERIALS TODAY ADVANCES
(2023)
Review
Materials Science, Multidisciplinary
Daniel Kiener, Michael Wurmshuber, Markus Alfreider, Gerald J. K. Schaffar, Verena Maier-Kiener
Summary: Nanoindentation techniques have been greatly improved by continuous stiffness monitoring capabilities, allowing for comprehensive characterization of hardness, elastic modulus, and plastic properties. By combining different methods and improving experimental conditions, insights into material behavior under extreme conditions can be achieved.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Michael Burtscher, Irmgard Weibensteiner, Reinhold Wartbichler, Katharina Kirchheimer, Christian Bernhard, Daniel Kiener, Helmut Clemens
Summary: This study analyzed the effect of C on the TNM alloying system using differential scanning calorimetry measurements, heat treatments, and electron microscopy analysis. The results showed that adding C can raise the service temperature of the alloy and promote the precipitation of hexagonal carbides. The orientation relationships between the TiAl phases and the carbides were also determined.
JOURNAL OF ALLOYS AND COMPOUNDS
(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.
