Article
Nanoscience & Nanotechnology
Hao Yang, Huamiao Wang, Zhaolong Yang, Yalin Huang, Dayong Li, Yinghong Peng, Peidong Wu
Summary: The microstructure evolution of Q&P1180 steel during uniaxial tension was comprehensively investigated, with tiny blocky retained austenite (RA) islands distributed in the matrix transforming into martensite during deformation. Experimental and model discussions focused on the effects of phase transformation on the stress-strain response and texture evolution of Q&P1180.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Qingge Xie, Zhiran Yan, Dunji Yu, Ke An, Xingchen Yan, Shuo Yin, Bobby Gillham, Xiaolong Wu, Ping Yang, Zhengzhi Zhao, Yandong Wang
Summary: In-situ neutron diffraction was used to reveal deformation damage during tension and compression for a high manganese steel. The lattice strains along transverse and loading directions showed indications of damage during tensile and compressive stress, respectively. The distribution of damaged grains was similar to grains with large Taylor factors.
Article
Materials Science, Multidisciplinary
Leo A. Kestens, Tuan Nguyen-Minh, Roumen H. Petrov
Summary: This paper investigates the influence of parent phase topology on the variant selection rule in crystalline materials. It is found that certain grain boundaries in the parent structure exhibit a specific crystallographic orientation relationship with the product phase, known as the Young-Kurdjumow-Sachs (YKS) orientation relationship. The study shows that around 20% of grain boundaries in different parent phase textures comply with the double YKS condition, regardless of the parent phase microstructure topology. The findings of this research provide insight into the formation of specific transformation textures in various practical cases.
Article
Nanoscience & Nanotechnology
Shiori Gondo, Rena Tanemura, Ryuki Mitsui, Satoshi Kajino, Motoo Asakawa, Kosuke Takemoto, Kenichi Tashima, Shinsuke Suzuki
Summary: This study investigates the evolution of mesoscale structure in drawn high carbon steel wires up to the drawing limit, showing that the wire undergoes four steps of evolution regardless of initial diameter. Tensile testing revealed a correlation between initial diameter and uniform elongation, as well as an impact of secondary fiber texture thickness on drawability. Maintaining the thickness of secondary fiber texture contributes to the improvement of drawability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Daniel J. Savage, Joshua T. White, Bjorn Clausen, Dale T. Carver, Sven C. Vogel, Sean R. Agnew, Donald W. Brown
Summary: The impact of deformation-induced structure change on the evolution of thermally induced strains is studied. The results show that the texture softens during heating, and twin boundary motion can accommodate large thermal strains. There are correlations between micro- and macro-level thermal expansions. The findings are significant for understanding the behavior of textured materials.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yusuke Onuki, Kazuki Umemura, Kazuki Fujiwara, Yasuaki Tanaka, Toshiro Tomida, Kaori Kawano, Shigeo Sato
Summary: In this study, the authors investigated the formation of metastable austenite in Fe-0.61C-1.9Si-0.98Mn during isothermal heating processes using in situ neutron diffraction techniques. They found that the carbon partitioning behavior was inhomogeneous, resulting in a bimodal carbon concentration distribution in austenite. Additionally, cementite formation mechanisms prevented the formation and retention of high carbon austenite.
Article
Materials Science, Multidisciplinary
Igor Vysotskiy, Sergey Malopheyev, Ivan Zuiko, Sergey Mironov, Rustam Kaibyshev
Summary: This study focuses on the crystallographic aspects of laser-powder bed fusion of 17-4 PH martensitic steel. The crystallization process showed an epitaxial mechanism and resulted in a specific crystal structure relationship between ferrite and austenite. Grain-boundary austenite was found to have a relationship with adjacent ferrite grains. The phase transformation from austenite to martensite did not exhibit significant variant selection.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
A. E. Davis, J. Donoghue, J. R. Kennedy, N. Byres, P. B. Prangnell
Summary: In-situ cooling experiments were conducted on Ti64 samples for the first time, revealing the development of alpha colonies. Primary alpha laths play a crucial role in influencing subsequent colony growth and transformation process by nucleating secondary alpha laths through sympathetic autocatalysis.
Article
Materials Science, Multidisciplinary
Steve Gaudez, Julien Teixeira, Sabine Denis, Guillaume Geandier, Sebastien Y. P. Allain
Summary: This study investigates the martensitic and nanobainite transformations in a low alloyed, high-Si steel. The martensite structure exhibits a mixed lath-plate morphology with a large scatter of sizes, while the bainite structure shows finer laths with more uniform sizes. The nanobainite study reveals that around two thirds of the carbon partitions from the ferrite to form transition iron carbides or enrich the austenite. Both processes occur rapidly but the ferrite remains supersaturated in carbon. The dislocation density increase in each new forming bainitic ferrite lath and then decreases as recovery becomes more significant.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Zachary N. Buck, Matthew J. Connolly, May L. Martin, Damian Lauria, Jason P. Killgore, Peter E. Bradley, Yan Chen, Ke An, Andrew J. Slifka
Summary: Interrupted tensile tests were performed on an AISI 4130 pressure vessel steel, and the results were investigated using neutron diffraction and scanning microscopy techniques. The study revealed an increase in dislocation densities and a strain-induced phase transformation beyond the ultimate tensile strength. Additionally, the characterization of microstructure and phase fractions using EBSD and SKPFM demonstrated the utility of SKPFM in distinguishing metallic phases with similar crystal structures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Wenqi Mao, Si Gao, Wu Gong, Stefanus Harjo, Takuro Kawasaki, Nobuhiro Tsuji
Summary: In this study, an in-situ neutron diffraction and digital image correlation measurement were conducted on an ultrafine grain stainless steel with a large Luders band deformation to assess the individual contributions of the austenite matrix and deformation-induced martensite to strain hardening during band propagation. The quantitive analysis revealed that the strain hardening of the austenite matrix was insufficient to maintain uniform deformation when the flow stress increased due to the ultrafine grain structure. The strain hardening required for Luders band propagation was primarily provided by martensite formation and the high internal stress within it.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
T. N. Vershinina, I. A. Bobrikov, S. Sumnikov, A. M. Balagurov, A. K. Mohamed, I. S. Golovin
Summary: The evolution of structural phases of Fe-38.4 at%Ga alloy was studied through neutron diffraction experiments, revealing phase transitions at specific temperatures and the dependency of transition temperatures on the alloy's prehistory.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
T. N. Vershinina, N. Yu. Samoylova, S. V. Sumnikov, A. M. Balagurov, V. V. Palacheva, I. S. Golovin
Summary: The evolution in phase composition of as-cast Fe-Ga alloys during continuous heating and subsequent cooling was studied, and distinct stages of phase formation were identified based on neutron diffraction analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Suo Li, Jian Li, Guangai Sun, Dean Deng
Summary: In this study, a butt-welded joint between P92 ferritic steel and SUS304 austenitic stainless steel was investigated. Finite element analyses were used to study the hardness and welding residual stress. Various factors influencing the formation of hardness and residual stress were considered, and the predicted results were in good agreement with the measurements. The effects of peak temperature, internal restraint, and differential thermal expansion were found to be decisive for the formation of residual stress.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Chao Wu, Yang Zhao, Xiaofeng Xu, Yachong Zhou, Xudong Yan, Zhicheng Wu, Lai We, Xiaoming Qiu
Summary: Electropulsing treatment can eliminate the hot-rolled and annealed texture in 35CrMo steel and produce a new <100> texture. The texture evolution law induced by electropulse was established by preparing gradient current density in steel. Electron backscattered diffraction and micro-region X-ray diffraction were used to study texture evolution. The observed phenomenon is attributed to the suppression and preferential grain growth caused by different scattering degrees of electron flow with various grain orientations.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Jordan A. Evans, Blake T. Sturtevant, Bjorn Clausen, Sven C. Vogel, Fedor F. Balakirev, Jonathan B. Betts, Laurent Capolungo, Ricardo A. Lebensohn, Boris Maiorov
Summary: In this study, resonant ultrasound spectroscopy was used to analyze the elastic anisotropy in extruded aluminum alloy 1100-O, revealing a transversely isotropic texture. The results confirmed by direct sound velocity measurements and neutron diffraction data showed that the texture-induced anisotropy in the material is consistent with extrusion-induced effects, demonstrating the potential of RUS as a general diagnostic and characterization tool for materials with similar levels of texture.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Yaron Itay Ganor, Eitan Tiferet, Sven C. Vogel, Donald W. Brown, Michael Chonin, Asaf Pesach, Amir Hajaj, Andrey Garkun, Shmuel Samuha, Roni Z. Shneck, Ori Yeheskel
Summary: The study investigated post-processing methods for additively manufactured Ti64 components, including heat treatments and HIP cycles, to modify microstructure and mechanical properties. Results showed that lowering the HIP holding temperature retained a fine microstructure, increased elongation and fatigue life. Higher HIP temperature resulted in coarser microstructure and lower Vickers hardness, but superior elongation and fatigue resistance.
Article
Chemistry, Multidisciplinary
Drew R. Onken, Didier Perrodin, Edith D. Bourret, Sven C. Vogel
Summary: This study investigates the impact of the Tl atom on the elpasolite structure, revealing that TLYC exhibits a tetragonal crystal structure at 296K and undergoes a structural transition to a cubic phase at 464K.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2021)
Editorial Material
Materials Science, Multidisciplinary
Sven C. Vogel, Marisa J. Monreal, Aditya P. Shivprasad
Article
Materials Science, Multidisciplinary
Sven C. Vogel, David A. Andersson, Marisa J. Monreal, J. Matthew Jackson, S. Scott Parker, Gaoxue Wang, Ping Yang, Jianzhong Zhang
Summary: Uranium trichloride (UCl3) is actively researched for various applications, such as molten salt reactors and actinide processing. The crystal structure evolution of UCl3 from room temperature to its melting point was studied using high-temperature neutron diffraction, with the thermal expansion of lattice parameters quantified. The melting point of UCl3 was determined to be 1108.2 K by differential scanning calorimetry.
Article
Chemistry, Physical
Stephen Scott Parker, A. Long, C. Lhermitte, S. Vogel, M. Monreal, J. M. Jackson
Summary: This study experimentally measured the melt point, enthalpy of fusion, and volumetric expansion of liquid chlorides. A novel method using neutron radiography was introduced for density measurement. The results and proposed model are significant for understanding the thermophysical properties of liquid chlorides.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Materials Science, Multidisciplinary
Shigehiro Takajo, Toshiro Tomida, El'ad N. Caspi, Asaf Pesach, Eitan Tiferet, Sven C. Vogel
Summary: This study investigated the microstructure of additively manufactured Ti-6Al-4V alloy using in situ high temperature EBSD. It found a significant suppression of alpha phase nucleation during slow cooling after heating to 950°C. The double Burgers orientation relationship was used to model the texture resulting from phase transformation, successfully reproducing the measured texture.
Article
Materials Science, Multidisciplinary
Vedant K. Mehta, Sven C. Vogel, Dan Kotlyar, Michael W. D. Cooper
Summary: This paper presents a study on the high-temperature properties of yttrium and yttrium hydride, including thermal lattice expansion effects, elastic moduli, and density. By providing these newly generated properties, it enhances the accuracy and reliability of reactor modeling.
Article
Materials Science, Multidisciplinary
Toshiro Tomida, Sven C. Vogel, Yusuke Onuki, Shigeo Sato
Summary: Texture memory is a phenomenon where initial textures are retained after a complete cycle of transformations, caused by variant selection. The prediction method using harmonic expansion of orientation distribution functions, including the introduction of double Burgers orientation relation (DBOR), proves to be a powerful tool for analyzing texture memory and providing predictive capabilities. The study explores texture memory in hexagonal metals and mechanisms of variant selections.
Article
Nanoscience & Nanotechnology
Nikolai Matukhno, Nemanja Kljestan, Sven C. Vogel, Marko Knezevic
Summary: This paper presents the results of an experimental investigation into the effect of cyclic bending under tension on the elongation-to-fracture (ETF) and strength of AZ31 sheets. The study found that the use of a continuous-bending-under-tension (CBT) apparatus can enhance ETF to some extent. However, the improvements in ETF are relatively small due to the uniform elongation of the alloy. The analysis of grain structure and texture evolution shows that slip-dominated deformation and twinning followed by detwinning occur during the process. Additionally, the study explores the tradeoff between strength and ductility by subjecting the alloy to a certain number of CBT cycles followed by heat treatments (HT). The findings reveal that the strength of the alloy can be increased by over 30% while preserving at least 5% of its ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Vancho Kocevski, Daniel A. Rehn, Adrien J. Terricabras, Arjen van Veelen, Michael W. D. Cooper, Scarlett Widgeon Paisner, Sven C. Vogel, Joshua T. White, David A. Andersson
Summary: Uranium mononitride (UN) is a promising nuclear fuel with advantageous properties for high temperature applications. This study uses ab initio molecular dynamics (AIMD) simulations to investigate UN behavior at different temperatures. The simulations reveal softening of phonon modes and increased compressibility of UN with temperature. The calculated thermal expansion and elastic properties are in good agreement with experimental measurements. Furthermore, the electronic properties and thermal conductivity are better predicted using AIMD simulations compared to calculations at 0 K. However, the thermal diffusivity shows an opposite temperature dependence due to underestimated electronic thermal conductivity.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Instruments & Instrumentation
Guangliang Yang, Josh Schoetker, Dan Poulson, Elena Guardincerri, J. M. Durham, Sven Vogel, Shaun Hoerner, Derek Aberle, Ke-Xun Sun, C. L. Morris, Ralf Kaiser, Andrew Osborne
Summary: Cosmic ray muons are massive charged particles that can penetrate through dense material, making them ideal for nondestructive imaging. A Giant Muon Tracker was used to measure muon tracks passing through samples and validate a Monte Carlo simulation. The imaging results from the simulation and experiment showed excellent agreement.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Materials Science, Multidisciplinary
Daniel J. Savage, Joshua T. White, Bjorn Clausen, Dale T. Carver, Sven C. Vogel, Sean R. Agnew, Donald W. Brown
Summary: The impact of deformation-induced structure change on the evolution of thermally induced strains is studied. The results show that the texture softens during heating, and twin boundary motion can accommodate large thermal strains. There are correlations between micro- and macro-level thermal expansions. The findings are significant for understanding the behavior of textured materials.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Instruments & Instrumentation
Matthew M. Schmitt, Daniel J. Savage, James J. Wall, John D. Yeager, Chanho Lee, Sven C. Vogel
Summary: The US Federal Regulations require regular inspection of centrifugally cast austenitic stainless steel pipes used in primary cooling loops of nuclear power plants. Conventional ultrasonic techniques are unreliable due to microstructural attenuation of ultrasonic waves. Texture and phase fraction measurements using neutron diffraction scans will inform the development of a more robust diagnostic tool.
QUANTUM BEAM SCIENCE
(2021)
Article
Imaging Science & Photographic Technology
Alexander M. Long, S. Scott Parker, D. Travis Carver, J. Matt Jackson, Marisa J. Monreal, Darcy A. Newmark, Sven C. Vogel
Summary: This study presents a novel approach to measuring densities of molten salt systems using neutron radiography. The results match well with previous literature values, confirming the viability of neutron radiography for measuring density as a function of temperature in molten salt systems. Additionally, advantages of using neutron radiography over other methods are discussed, with future work focusing on improving this technique.
JOURNAL OF IMAGING
(2021)
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.
