Article
Mechanics
Bjorn Hakon Frodal, Lars Lodgaard, Yngve Langsrud, Tore Borvik, Odd Sture Hopperstad
Summary: The bendability of extruded profiles of an age hardenable aluminum alloy with different grain structures was investigated. A coupled damage and single crystal plasticity model was used in finite element analyses to study the influence of grain structure on bending behavior. The crystal plasticity simulations captured the difference in bendability and predicted a higher bendability for one profile, in agreement with experimental results. The grain structure affects shear band formation and the local texture plays a role in crack initiation and propagation.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Materials Science, Multidisciplinary
Mikhail Khadyko, Bjorn Hakon Frodal, Odd Sture Hopperstad
Summary: The study proposed a regularized model of porous crystal plasticity, which can describe the plastic behavior of materials under various stresses and be applied in a finite element code. Simulation results demonstrate the model's capability to effectively explain the interaction between different modes of strain localization, as well as the initiation and propagation of ductile fracture.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Mechanics
Bjorn Hakon Frodal, Susanne Thomesen, Tore Borvik, Odd Sture Hopperstad
Summary: This study investigates the fracture anisotropy of two extruded aluminium alloys with different microstructures. By comparing finite element simulations with experimental tests, the important role of crystallographic texture in plastic anisotropy is highlighted.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Wei Jiang, Yinyin Li
Summary: This study investigates the effects of microstructure characteristics on the cumulative plastic slip (CPS) in the dominant slip system (DSS) at meso-scale and the J-integral at macro-scale using the combined crystal plasticity finite element method and variable-node finite element method. Experimental evidence shows that the grain size of the repaired layer is significantly smaller when an appropriate amount of nano tungsten carbide (WC) is added at the crack tip, leading to a greatly reduced J-integral in the repaired specimen. The addition of nano-WC during the laser repairing process serves to strengthen the material and refine the grain of the repaired layer, improving fracture properties.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Mechanics
Jinwoo Lee, Hyuk Jong Bong, Hyeonil Park, Daeyong Kim
Summary: In this study, the plastic deformation behavior, ductile damage, and fracture of aluminum alloy 2024-O materials were investigated under quasi-static conditions. Experimental tests were conducted to characterize the plasticity and damage behavior, and finite element simulations were performed to predict the behavior. The results showed that the modified GTN model provided better predictions of the plasticity and ductile damage behavior.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Sandra Baltic, Julien Magnien, Stefan Kolitsch, Hans-Peter Gaenser, Thomas Antretter, Rene Hammer
Summary: The research successfully simulated two different failure modes in structures with precracks using ductile fracture locus models and local damage/element deletion approach, with detailed explanations of the failure process.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Ryan J. Lane, Ayyoub M. Momen, Michael S. Kesler, Jamieson Brechtl, Orlando Rios, Kashif Nawaz, Reza Mirzaeifar
Summary: This study investigates the mechanical properties and microstructure characteristics of aluminum-cerium-magnesium alloys, developing a computational-experimental framework to study the material mechanics. Experimental results show that the percentage of intermetallics and material texture play a significant role in controlling the mechanical properties of the alloy.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Jean-Michel Scherer, Jacques Besson, Samuel Forest, Jeremy Hure, Benoit Tanguy
Summary: A new strain gradient void-driven ductile fracture model for single crystals is proposed and applied to simulate crack propagation in single and oligo-crystal specimens, taking into account the significant influence of plastic anisotropy on crack path, ductility, and fracture toughness.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Mechanics
Madhav Baral, Yannis P. Korkolis
Summary: This paper revisits experimental and finite element modeling studies to investigate the fracture envelope of materials under different loading paths, with Yld2000-2D and Yld2004-3D yield criteria found to offer significantly better agreement with experimental results than von Mises. The fracture locus shows specific variations under different triaxiality loading conditions.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Chemistry, Physical
Xiaoyu Zheng, Qi Huang, Hong Mao, Kai Li, Namin Xiao, Xingwu Li, Yong Du, Yuling Liu, Yi Kong
Summary: This study develops a single-crystal strength model including precipitate enhancement effects and applies it to the mechanical simulation of Al-Mg-Si alloy. The simulation results agree well with experimental results, indicating the realistic physical implications of the model. The study also suggests that different precipitate phases should be separately considered when simulating the mechanical response of Al-Mg-Si alloy.
Article
Nanoscience & Nanotechnology
Daniel L. Foley, Marat Latypov, Xingyuan Zhao, Jonathan Hestroffer, Irene J. Beyerlein, Leslie E. Lamberson, Mitra L. Taheri
Summary: It was found that crystal orientation has a significant impact on GND density, with the highest density in grains with a 101 101 compression texture; additionally, grain boundaries play a crucial role as strong dislocation sources in the evolution of GND density.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
T. Yalcinkaya, I. T. Tandogan, I Ozdemir
Summary: High strength aerospace alloys, such as the Al 7000 series, are prone to loss of fracture toughness during heat treatment, leading to intergranular ductile fracture. This is often caused by the formation of large precipitates at grain boundaries and the development of precipitate free zones. Consequently, grain boundaries become potential locations for micro void formation and evolution under external loads, resulting in intergranular crack formation and propagation in the material.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Engineering, Multidisciplinary
Alessandro Marengo, Umberto Perego
Summary: This paper proposes a variational formulation of small strain ductile fracture based on a phase-field modeling of crack propagation. The formulation combines an effective stress description of gradient plasticity with an AT1 phase-field model and incorporates both elastoplastic and phase-field dissipations in a consistent manner. The interaction between ductile and brittle dissipation mechanisms is modeled using a plasticity-driven crack propagation model. A non-variational function of the equivalent plastic strain is introduced to modulate the phase-field dissipation based on the developed plastic strains. The paper also presents a robust and computationally effective Newton-Raphson scheme for Mises plasticity, supplemented by a line-search scheme, for solving the gradient elastoplasticity problem for fixed phase field. Several benchmark tests demonstrate the robustness and accuracy of the proposed model.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Chemistry, Physical
Takayuki Shiraiwa, Fabien Briffod, Manabu Enoki
Summary: A method for predicting fatigue crack initiation of the 7075 aluminum alloy by crystal plasticity finite element analysis considering microstructures was proposed in this study. The calculated crack initiation life and morphology were in good agreement with the experimental results, indicating the effectiveness of the proposed method in predicting fatigue crack initiation in aluminum alloys.
Article
Mechanics
Vetle Espeseth, David Morin, Tore Borvik, Odd Sture Hopperstad
Summary: This paper presents a gradient-based non-local GTN model to solve the pathological mesh dependency problem in finite element simulation of strain-softening materials. The porosity is averaged using an implicit gradient model, and the gradient model is implemented in Abaqus/Explicit. The proposed approach can effectively remedy the mesh dependency problem and accurately predict the fracture mode of the material.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Yung Suk Jeremy Yoo, Anastasia Mullins, Sazol Has, DaeHoon Kang, Richard Hamerton, Saransh Singh, Marc De Graef, Josh Kacher
Summary: The influence of dispersoids and grain boundary characteristics on the crack propagation behavior in AA3xxx during deep drawing was investigated, with cracks typically forming on the material surface at the earliest stages of deformation and extending with increasing strain. The cracks propagated along intergranular paths with bifurcations correlating with triple junction locations, but no strong trends were identified linking grain boundary characteristics to crack propagation pathways. Dispersoids at grain boundaries were found to arrest crack propagation and divert crack growth pathways, demonstrating the first practical application of combining the dictionary indexing method with TKD analysis.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Sandra Stangebye, Yin Zhang, Saurabh Gupta, Ting Zhu, Olivier Pierron, Josh Kacher
Summary: Transmission electron microscopy (TEM) imaging relies on high energy electrons for atomic scale resolution. The electron beam (e-beam) was found to enhance plastic deformation in nanocrystalline Al, leading to an increase in plastic strain rate and a decrease in activation volume, while having a weaker effect on ultrafine-grained Au. The e-beam effect is due to an effective temperature increase from additional atomic fluctuations.
Article
Engineering, Electrical & Electronic
Josh Kacher, Yao Xie, Sven P. Voigt, Shixiang Zhu, Henry Yuchi, Jordan Key, Surya R. Kalidindi
Summary: This article discusses the combination of signal processing and statistical analysis with TEM data collection capabilities in materials science. It highlights the application of image analysis, feature extraction, and streaming data processing techniques, and presents a future outlook on opportunities for integrating signal processing with automated TEM data analysis.
IEEE SIGNAL PROCESSING MAGAZINE
(2022)
Article
Nanoscience & Nanotechnology
Yung Suk Jeremy Yoo, Yang Su, Sazol Das, Richard Hamerton, Josh Kacher
Summary: This study investigates the microstructural origins and early behavior of crack formation in AA6451 samples under three-point bending using a multiscale electron microscopy-based approach. The results show that grain boundary ledges are formed prior to crack formation and their formation is influenced by the precipitate state. Additionally, constituent particles have no significant influence on damage nucleation processes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Jacob N. Vagott, Kathryn Bairley, Juanita Hidalgo, Carlo A. R. Perini, Andres-Felipe Castro-Mendez, Sarah Lombardo, Barry Lai, Lihua Zhang, Kim Kisslinger, Josh Kacher, Juan-Pablo Correa-Baena
Summary: Atomic layer deposition (ALD) allows precise control over the thickness, stoichiometry, and structural defects of materials. This study deposited lead iodide (PbI2) using a facile ALD process with readily accessible and low-cost precursors. The deposited PbI2 was characterized using various techniques and lays the foundation for further development of lead halide perovskite processes by ALD.
CHEMISTRY OF MATERIALS
(2022)
Article
Multidisciplinary Sciences
Michael Hoffmann, Zheng Wang, Nujhat Tasneem, Ahmad Zubair, Prasanna Venkatesan Ravindran, Mengkun Tian, Anthony Arthur Gaskell, Dina Triyoso, Steven Consiglio, Kandabara Tapily, Robert Clark, Jae Hur, Sai Surya Kiran Pentapati, Sung Kyu Lim, Milan Dopita, Shimeng Yu, Winston Chern, Josh Kacher, Sebastian E. Reyes-Lillo, Dimitri Antoniadis, Jayakanth Ravichandran, Stefan Slesazeck, Thomas Mikolajick, Asif Islam Khan
Summary: Crystalline materials with broken inversion symmetry can exhibit spontaneous electric polarization, which can transform a non-polar phase into a polar phase by the application of an electric field. The antiferroelectric transition in ZrO2 causes a negative capacitance, which has potential applications in electronics.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Jahnavi Desai Choundraj, Josh Kacher
Summary: This paper investigates the influence of local microstructure characteristics on the sensitization susceptibility of AA5456 alloy, and finds a correlation between geometrically necessary dislocation density and sensitized boundary rates. The results highlight the importance of considering factors beyond grain boundary characteristics in determining susceptibility to sensitization.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
K. D. Koube, G. Kennedy, K. Bertsch, J. Kacher, D. J. Thoma, N. N. Thadhani
Summary: This paper investigates the spall damage mechanisms in LPBF-fabricated stainless steel SS316L under uniaxial strain plate-impact loading. The failure evolution with increasing impact velocity and peak pressure is explored, revealing a heterogeneous failure response and various failure mechanisms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Sandra Stangebye, Changhui Lei, Aubri Kinghorn, Ian Robertson, Josh Kacher, Khalid Hattar
Summary: The dynamics of the gold-silicon eutectic reaction in limited dimensions were studied, revealing that the transformation process involves dislocation, grain boundary motion, and silicon diffusion, resulting in significant changes in the microstructure of the film.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Josh Kacher, Timothy Ruggles, Jordan Key, Matthew Nowell, Stuart Wright
Summary: This study demonstrates the ability to quantitatively characterize the dislocation structures in additive and traditionally manufactured alloys, and discusses potential defect formation mechanisms using high angular resolution electron backscatter diffraction analysis.
SCRIPTA MATERIALIA
(2022)
Article
Physics, Applied
K. D. Koube, T. Sloop, K. Lamb, J. Kacher, S. S. Babu, N. N. Thadhani
Summary: This study investigates spall failure and damage modes in Laser Powder Bed Fusion fabricated Stainless Steel 316L (SS316L) with intentional low-volume porosity. The results show that the suppression of spall failure is observed with increasing porosity, transitioning from spall-centered tensile stress dominated failure to a pore-centered microstructure-dominated damage mode involving void/crack nucleation and growth. The critical porosity level and spall location depend on both the volume fraction and the size of the initially fabricated pores. Heterogeneous deformation twinning, shear banding, grain rotation, and cracking are observed around pre-existing pores and expected spall failure sites.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
F. N. U. Md Moniruzzaman, Shawkat Imam Shakil, Sugrib Kumar Shaha, Josh Kacher, Ali Nasiri, Meysam Haghshenas, Amir Hadadzadeh
Summary: Direct aging heat treatment recipes were developed for additively manufactured (AM) PH13 -8Mo stainless steel by studying the kinetics of precipitation phase transformation. Different AM processes (arc-DED and L-PBF) resulted in different microstructures and properties. The direct aging treatments improved the strength and ductility of the materials by controlling the formation of bNiAl precipitates and preserving pre-existing dislocation networks.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Taejoon Park, David Montes de Oca Zapiain, Farhang Pourboghrat, Hojun Lim
Summary: This study develops a data-driven method for predicting plastic anisotropy in materials using a deep learning model. The model accurately and efficiently predicts the relationship between the initial crystallographic texture and plastic anisotropy by training on a large dataset of crystal plasticity calculations.
Article
Nanoscience & Nanotechnology
Yang Su, Thanh Phan, Liming Xiong, Josh Kacher
Summary: This paper combines in situ high-resolution electron backscattered diffraction (EBSD) with concurrent atomistic-continuum (CAC) simulations to investigate the interactions between dislocation-mediated slip and grain boundaries (GBs) in Ni. The study shows that the local stress at slip-GB intersections initially increases with the pileup of dislocations and remains high, even after the nucleation of dislocations in the neighboring grain. The local stress only relaxes when the nucleated dislocations propagate away from the GB due to more incoming dislocations participating in the pileup. The relaxation of local stress is accompanied by the reconfiguration of atomic-scale GB structure, which not only affects subsequent dislocation transmission but also the configuration of dislocations away from the GB. These findings highlight the importance of incorporating local stress history in higher length scale models, such as crystal plasticity finite element.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Manufacturing
Collin Stiers, Katie Koube, Ethan Sinclair, Hyoungjun Sim, Elias Winterscheidt, Josh Kacher
Summary: A hydrogen reduction-based method for additive manufacturing of carbon steels from low cost and stable oxide powders is introduced. This method utilizes materials extrusion processes to extrude inks comprised of oxide powders, plastic binders, and solvents. The addition of carbon during the reduction process is demonstrated, resulting in through-thickness carburization of the final parts.
ADDITIVE MANUFACTURING LETTERS
(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.
