Article
Materials Science, Multidisciplinary
Anuj Bisht, Michael Kalina, Eylul Suadiye, Gunther Richter, Eugen Rabkin
Summary: In this study, nanoscale bimetallic strips were fabricated by one-sided coating with Pd, leading to slight bending of the strips. The temperature-induced shape changes of the Au-Pd strips were investigated via in-situ thermal actuation. The results demonstrate that single crystalline metallic nanowhiskers with controlled curvature, chemical composition, and thermal behavior can be produced using interface engineering and chemical interdiffusion.
Article
Materials Science, Multidisciplinary
Kai Chen, Hongxian Xie, Yanhui Qie, Huiqiu Deng
Summary: Misfit dislocations have a significant impact on the nucleation and growth of helium bubbles, with helium bubbles energetically preferring to nucleate at the intersections of misfit dislocations or on some misfit dislocations. During the bubble growing process, metal interstitial atoms pushed out by the bubble are directly absorbed into nearby misfit dislocations, leading the helium bubble to move away from the bimetal interface.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Engineering, Mechanical
A. Selimov, K. Chu, D. L. McDowella
Summary: Interdiffusion during the manufacturing of metallic nanolaminates leads to diffuse interface structures which affect the interface shear strength. This study examines the shear responses of Cu/Ni nanolaminate interfaces with varying levels of interdiffusion, and finds that diffuse interfaces have improved interface shear strength relative to atomically sharp interfaces. However, shear strength does not increase monotonically with solute concentration, indicating the presence of heterogeneous interface resistance to sliding.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Physics, Applied
Yujia Liu, Kevin-Peter Gradwohl, Chen-Hsun Lu, Kaspars Dadzis, Yuji Yamamoto, Lucas Becker, Peter Storck, Thilo Remmele, Torsten Boeck, Carsten Richter, Martin Albrecht
Summary: The formation of misfit dislocations in quantum well layers grown by molecular beam epitaxy can negatively affect qubit behaviors. In this study, we investigated the kinetics and interactions of misfit dislocations by annealing strained Si or Ge layers. The results showed that misfit dislocation propagation is a thermally activated process and blocking interactions can reduce strain relaxation. These findings suggest that it is possible to suppress misfit dislocation formation by reducing temperatures during SiGe heterostructure epitaxy for developing high-performance spin qubits.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Alex Selimov, Shuozhi Xu, Youping Chen, David McDowell
Summary: The study investigates the evolution of misfit structures at semi-coherent metal interfaces impinged by dislocation pileups using a Concurrent Atomistic-Continuum modeling framework, revealing the impact of different metals on the interface misfit structure.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Metallurgy & Metallurgical Engineering
Jing-Peng Xiong, Yi-Qi Zeng, Jin-Long Liu, Wei-Cheng Wang, Lan Luo, Yong Liu
Summary: The interfacial structure in magnesium matrix composites plays a crucial role in their mechanical properties. A new approach to interface design using a semi-coherent structure with superior bonding strength was proposed. Lanthanum oxide was selected as the candidate material for the intermediate layer due to its low lattice mismatch and high interfacial bonding strength. Theoretical calculations and experimental validations confirmed the strong interfacial bonding strength in the resulting composites.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Chemistry, Physical
Nisha Dhariwal, Abu Shama Mohammad Miraz, W. J. Meng, Collin D. Wick
Summary: The effect of Al doping on the stability and shear strength of the Ti/TiN interface was examined using a modified embedded atom model. By parameterizing the model to various inter-facial properties, good agreement was found with Density Functional Theory and experimental data. The presence of Al atoms led to a more negative enthalpy and increased shear strength, especially at higher Al compositions.
APPLIED SURFACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Ilya Svetlizky, Seongsoo Kim, David A. Weitz, Frans Spaepen
Summary: This study uses colloidal crystals to investigate the interactions and evolution of dislocations during plastic deformation, providing insights into the macroscopic deformation and atomic-scale dislocation dynamics of materials.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
M. E. Twigg, G. G. Jernigan
Summary: Research indicates that in heteroepitaxial semiconductor films, thinner and mechanically stiffer blocking layers are more effective in reducing the Peach-Koehler force, thereby preventing dislocation generation.
JOURNAL OF APPLIED PHYSICS
(2021)
Review
Materials Science, Multidisciplinary
Hua Men, Changming Fang, Zhongyun Fan
Summary: This study investigates the effects of the physical and chemical properties of the substrate on prenucleation using classical molecular dynamics and ab initio MD simulations. It reveals that the physical origin of prenucleation is structural templating, which is influenced by the lattice misfit, chemical interaction, and substrate surface roughness at the atomic level. Prenucleation ultimately determines substrate's nucleation potency and provides a precursor for heterogeneous nucleation at the nucleation temperature.
Article
Materials Science, Multidisciplinary
Ashish Chauniyal, Rebecca Janisch
Summary: Gamma/gamma interfaces play a crucial role in driving plastic deformation in lamellar TiAl alloys. The presence of different variants of gamma/gamma twin interfaces, such as coherent and semicoherent interfaces, results in variations in deformation behavior. It has been found that the coherency state of the gamma/gamma interfaces leads to preferential nucleation and affects the strength of the lamellar microstructure. These findings contribute to the future design of alloy microstructures based on interface types and coherency states.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
C. J. Wang, Z. R. Liu, B. N. Yao, X. F. Kong, D. Legut, R. F. Zhang, Y. Deng
Summary: This study found that the position of hydrogen clusters has a significant impact on dislocation nucleation and interface sliding in metallic nanocomposites, providing a rational atomistic mechanism for the effect of hydrogen clusters on interface facilitated plasticity.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Nisha Dhariwal, Abu Shama Mohammad Miraz, W. J. Meng, Bala R. Ramachandran, Collin D. Wick
Summary: The effect of misfit dislocation networks (MDNs) on the stability and shear strength of Cr/TiN was investigated. The study found that the interfacial energy was lowest when MDN was located in the Cr layer adjacent to the chemical interface, resulting in the largest dislocation core widths and shear failure in the ceramic.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Liang Chen, Kaixuan Lei, Qian Wang, Lei Wang, Haoran Gong
Summary: This paper systematically investigates defect evolutions and mechanical properties of W/Fe semi-coherent interfaces under irradiation using molecular dynamic simulation. It is found that the formation of semi-coherent interfaces can inhibit the nucleation of dislocation loops and improve irradiation resistance. The effects of interface orientation on mechanical properties of W/Fe interfaces under irradiation are also discussed.
Article
Metallurgy & Metallurgical Engineering
Yong Xie, Zhixin Xia, Jixin Hou, Jiachao Xu, Peng Chen, Le Wan
Summary: By increasing the Cu content in CoCrNiCux alloys, the microstructure transitions from a single matrix phase to a dual-phase structure, accompanied by a shift in tensile fracture behavior from brittle to plastic. This results in an increase in tensile strength and ductility. Nanoprecipitates and neatly arranged misfit dislocations contribute to enhancing the strength and plasticity of the alloy, while twins in the matrix phase and coordinated dual-phase structures further improve mechanical properties.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Bingqiang Wei, Wenqian Wu, Mingyu Gong, Shuwei Yu, Song Ni, Min Song, Jian Wang
Summary: Deformation twinning is crucial in determining the mechanical behavior of hexagonal metals. Lowering the energy of basal stacking faults can promote the formation of basal stacking faults and face centred cubic phase, which affects the propagation and growth of deformation twins. This study provides insights into the influence of lowering basal stacking faults energy on twinning behaviors in hexagonal metals.
Article
Engineering, Multidisciplinary
Yiming Wu, Chang Zhou, Rui Wu, Lixin Sun, Chenyang Lu, Yunzhen Xiao, Zhengxiong Su, Mingyu Gong, Kaisheng Ming, Kai Liu, Chao Gu, Wenshu Yang, Jian Wang, Gaohui Wu
Summary: Aluminum alloys have low yielding and flow strengths, but a super-strong Al-30vol%SiC composite with a flow strength of 1.18 GPa and a uniform strain of 16.0% was reported. The alloy exhibited strengthening from nano-spaced SiC nanowires and high-density stacking faults (SFs) rarely stabilized in Al. SFs showed excellent thermal stability up to 320 degrees C and could be regained by thermal cooling even after elimination during annealing at 600 degrees C.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Bingqiang Wei, Wenqian Wu, Jian Wang
Summary: Ni-SiOC nanocomposites exhibit two characteristic microstructures and display high strength and good plastic flow stability. However, their fracture behavior and plasticity vary under different testing conditions.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Bingqiang Wei, Wenqian Wu, Jian Wang
Summary: Ni-SiOC nanocomposites maintain crystal-amorphous dual-phase nanostructures after high-temperature annealing at different temperatures. Both crystal Ni and amorphous SiOC maintain stability under He irradiation. The amorphous SiOC ceramic is immune to He irradiation damage, contributing to the He irradiation resistance of Ni alloy.
Article
Chemistry, Multidisciplinary
Amanda L. L. Coughlin, Zhiliang Pan, Jeonghoon Hong, Tongxie Zhang, Xun Zhan, Wenqian Wu, Dongyue Xie, Tian Tong, Thomas Ruch, Jean J. J. Heremans, Jiming Bao, Herbert A. A. Fertig, Jian Wang, Jeongwoo Kim, Hanyu Zhu, Deyu Li, Shixiong Zhang
Summary: Enhancement of electron correlation in a topological metal, iridium dioxide, is demonstrated through vanadium doping. The increase in electron correlation is supported by Raman intensity decrease and increased electrical resistivity. The doping also leads to a significant reduction in lattice thermal conductivity. Density functional theory calculations suggest that the reduction in thermal conductivity is due to complex phonon dispersion and reduced energy gap between phonon branches.
Article
Engineering, Manufacturing
Haifei Lu, Weiwei Deng, Kaiyu Luo, Yuhua Chen, Jian Wang, Jinzhong Lu
Summary: An innovative hybrid additive manufacturing (HAM) technology combining laser shock peening without coating (LSPwC) and laser powder bed fusion (LPBF) has been proposed to tailor the microstructure of additively manufactured Ti6Al4V titanium alloys. The experimental results demonstrated that the martensitic laths in the LSPwC-treated region changed to equiaxed ultrafine grains under alternating mechanical and thermal effects. Consequently, compared with the LPBF specimen, the HAM specimen indicated a high ultimate tensile strength of -1303 MPa and an excellent elongation of -12.7 %.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Quan Li, Mingyu Gong, Jiancheng Jiang, Yiwen Chen, Houyu Ma, Yujuan Wu, Yongxiang Hu, Yue Liu, Guisen Liu, Jian Wang, Xiaoqin Zeng
Summary: We quantitatively measured the twinning shear of three twinning modes at an atomic level, allowing us to determine the character of elementary twinning dislocation. These findings not only clarify the twinning mechanisms but also provide a method to determine other complex shear mechanisms at an atomic level.
Article
Engineering, Mechanical
Mingyu Gong, Dongyue Xie, Tianyi Sun, Xinghang Zhang, Lin Shao, Jian Wang
Summary: A microstructure- and temperature-dependent crystal plasticity model is used to understand the mechanical properties of FeCrAl alloys. The model considers the temperature-dependent frictional resistance and microstructure-dependent irradiation hardening. The results provide insights into the thermo-mechanical behavior of unirradiated/irradiated FeCrAl alloys.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Coatings & Films
N. J. Anderson, Bin Zhang, A. C. Meng, Xiaoman Zhang, K. P. Lijesh, M. M. Khonsari, W. J. Meng
Summary: A series of Cr-containing hydrogenated amorphous carbon (a-C:H:Cr) coatings were deposited onto 316 stainless steel (316SS) substrates using inductively coupled plasma assisted reactive sputter deposition. Elemental Cr interlayers with different thicknesses of 100, 200, and 300 nm were deposited between a-C:H:Cr and 316SS. The fracture toughness of the a-C:H:Cr/Cr/316SS interfacial regions was measured and found to have a linear correlation with the area fraction of the fracture surface occurring in the Cr interlayer, suggesting that interfacial toughness can be engineered through materials design.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Erfan Maleki, Okan Unal, Shuai Shao, Nima Shamsaei
Summary: The mechanical properties of Al alloys make them ideal for various industries such as marine, aerospace, and automotive. Additive manufacturing (AM) has been used to fabricate complex infrastructures/components using Al alloys with great design freedom. Improving the corrosion resistance of Al alloys has been a focus of research. Laser shock peening (LSP) treatment with different laser pulse overlaps and energies was investigated in this study, and it was found that LSP treatment improved microstructure, surface texture, porosity, hardness, residual stresses, and corrosion resistance of laser powder bed fused (L-PBF) AlSi10Mg samples.
Article
Engineering, Mechanical
Yucong Gu, Jonathan Cappola, Jian Wang, Lin Li
Summary: This study investigates the yielding behavior of heterogeneous metallic glasses (MGs) by varying the spatial correlation and standard deviation of local shear moduli associated with clustering atoms on the nanoscale. Through computations and observations, the study proposes a Hall-Petch-like relationship where the yield stress of MGs scales inversely with the square root of the spatial correlation length. The results provide insights into the structure-property relationship of MGs and have important implications for the design of nanoscale MGs with tunable properties.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Arkajit Ghosh, Wenqian Wu, Bibhu Prasad Sahu, Jian Wang, Amit Misra
Summary: Nano-scale eutectics, such as rapid solidified Al-Si, exhibit enhanced yield strength and strain hardening but limited plasticity. In this study, fully eutectic Al-Si microstructures with heavily twinned Si nano-fibers were synthesized using laser rapid solidification and chemical modification. These microstructures showed high hardness and stable plastic flow, with a mechanism of partial dislocation-mediated plasticity observed in the deformed Si(Sr) fibers. The findings provide insights into the plasticity mechanisms of nano-eutectic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Multidisciplinary Sciences
Bin Zhang, K. L. Nielsen, J. W. Hutchinson, W. J. Meng
Summary: This study investigates the mechanical properties of micron-scale single-crystal structural elements through experiments and theoretical analysis. The experimental results show that the size-dependent strengthening of structural elements can be achieved by surface passivation. A strain gradient plasticity theory is used to analyze the structural elements, and the computed trends replicate the experimental trends with reasonable fidelity. However, the study also highlights the need to address certain constitutive and computational issues before the theory can be effectively applied at the micron scale.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Multidisciplinary
Xiaoman Zhang, W. J. Meng, Andrew C. Meng
Summary: We observed Kirkendall voids at the epitaxial TiN/MgO(001) interface, revealing the diffuse nature of the interface and indicating a strong chemical driving force for diffusion. The observed rectangular voids extend into both TiN and MgO, resulting from a large chemical potential gradient at the interface. The localization of the voids within approximately 10 nm from the interface suggests the influence of a chemical potential gradient.
Article
Chemistry, Physical
Xiaoman Zhang, Eric A. Stach, W. J. Meng, Andrew C. Meng
Summary: In this study, epitaxial wurtzite AlScN thin films were grown on Si (111) substrates by ultra-high vacuum reactive sputtering. Sc alloying in AlN enhances piezoelectricity and induces ferroelectricity, making epitaxial thin films suitable for systematic investigations of these materials. Increasing Sc concentration leads to crystalline disorder and a structural transition from wurtzite to rocksalt, as well as nanoscale compositional segregation consistent with spinodal decomposition. The observed composition fluctuations are correlated with polarization domains, suggesting an influence on ferroelectric properties. These results provide a route for creating single crystal AlScN films and self-assembled composition modulation.
NANOSCALE HORIZONS
(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.
