Article
Engineering, Chemical
Maria Yokota, Takumi Kusano, Mikiya Mori, Katsuharu Okuda, Takuro Matsunaga
Summary: In this study, a novel press cell was developed for in-situ observation of the internal structure of powder materials using synchrotron-radiation computed laminography technique. The press cell was capable of compressing powder beds at pressures up to 100 MPa, and clear reconstructed images were obtained under compression pressure. By analyzing the obtained three-dimensional reconstructed images, changes in contact number and area between particles, as well as thickness and tortuosity of percolation path, were clarified.
Article
Mechanics
S. Streck, T. Wiege, S. Dietrich, R. Herger, V. Schulze
Summary: Pores and defects in aluminium die cast alloys have a critical impact on the fatigue properties and lifespan of components. Recent research has used X-ray computed tomography scans and machine vision to analyze and predict the failure behavior and internal structure of defects. In this study, defects in the die cast aluminium alloy EN-AC46200 were analyzed using CT scans and evaluated with modern 3D image analysis software. The stress intensity was determined by combining pore analysis with machine vision.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Xixi Dong, Hamza Youssef, Xiangzhen Zhu, Yijie Zhang, Shihao Wang, Shouxun Ji
Summary: The addition of titanium diboride nanoparticles can enhance the strength and maintain ductility of die-cast AlSi9Cu2Mg alloy. Fe-rich compounds and Q-phase were prone to cracking after the addition of titanium diboride nanoparticles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Erfan Azqadan, Jared Uramowski, Ali A. Roostaei, Seyed Behzad Behravesh, Amjad Javaid, Bruce W. Williams, Mary A. Wells, Hamid Jahed
Summary: The effect of casting cooling rate and degassing on the mechanical properties of cast AZ80 alloy is investigated. The results show that the casting cooling rate, the morphology of primary alpha-Mg, and the presence of porosity defects all play important roles in the mechanical properties of the material. Higher cooling rates and finer dendritic morphology of alpha-Mg improve the mechanical properties, while effective degassing at lower cooling rates helps reduce the volume fraction of porosity defects and enhance fatigue resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Shanming Yuan, Yongcun Li, Yu Xiao, Wenzong Li, Hao Zhang, Xiaofang Hu, Feng Xu
Summary: This paper reveals the deformation and failure mechanisms of antlers during tensile process, as well as the evolution of its internal structure, through observation and analysis of the internal microstructure of antlers. The results show that the pore structure and special high shear strain distribution regions of antlers play important roles in its load-bearing capacity and energy dissipation.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Feng Wang, Yu-Lung Chiu, Dmitry Eskin, Wenjia Du, Paul R. Shearing
Summary: The study found that the addition of vanadium can cause grain refinement of cast commercial purity aluminium, mainly due to the high nucleation potency and sufficient growth restriction effect of Al10V particles. In addition, the relatively large size of Al10V particles helps to promote the nucleation of aluminium grains.
MATERIALS CHARACTERIZATION
(2021)
Review
Materials Science, Multidisciplinary
Yue Li, Hongxiang Li, Laurens Katgerman, Qiang Du, Jishan Zhang, Linzhong Zhuang
Summary: This article reviews the development of hot tearing in aluminium alloys, explaining the phenomenon and mechanism, characterising the mechanical properties and susceptibility, providing data on mushy zone behavior, examining the impact of composition and casting parameters, describing hot tearing simulations, and making recommendations for further research development.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Katrin Bugelnig, Holger Germann, Thomas Steffens, Robert Koos, Elodie Boller, Fabian Wilde, Guillermo Requena
Summary: This study investigates the strain-controlled thermomechanical fatigue behavior of three cast near-eutectic Al-Si alloys with different Ni, Cu, and Mg contents. Synchrotron tomography and neutron diffraction experiments are used to correlate 3D microstructural features with damage initiation and evolution. The results show that the alloy with lower Cu, Ni, and Mg concentrations has higher thermomechanical fatigue resistance and slower damage accumulation compared to other alloys, resulting from its higher ductility and the absence of large primary Si clusters which act as preferred crack initiation sites during the early stages of thermomechanical fatigue.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yonghao Yu, Hongchao Kou, Yichao Wang, Mengyu Jia, Xiaoxuan Xu, Zilong Zhang, Yarong Wang, Jinshan Li
Summary: Understanding the phase evolution is crucial for controlling microstructure and material performance. TiAl alloys with lightweight and elevated temperature properties are suitable for high-temperature applications. However, improving the microstructure and properties of TiAl alloys through hot working is challenging due to the difficulty in breaking up the lamellar colonies in the original microstructure. This study proposes a method for complete fragmentation of the lamellar structure in beta-solidified TiAl alloys by introducing a core-shell-like structure before hot working.
Article
Materials Science, Multidisciplinary
Bo Hu, Zixin Li, Dejiang Li, Tao Ying, Xiaoqin Zeng, Wenjiang Ding
Summary: A criterion based on solidification microstructure was proposed to predict the hot tearing behavior of cast alloys, considering various factors. The credibility of this criterion was validated through the study of hot tearing behavior of Mg-Ce alloys, and a simplified criterion and hot tearing index for specific cases were derived and validated.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Xin Hu, Chen Chen, Yanguo Li, Zhinan Yang, Fucheng Zhang, Wei Zhang
Summary: This study systematically investigated the microstructure evolution of 7Mo-0.42N contained cast super austenitic stainless steel (SASS) during compression deformation at high temperature. The recrystallization behavior of SASS was found to occur in three stages, and various phenomena such as grain refinement, abnormal growth, and dislocation evolution were observed. Additionally, the nucleation mechanism was found to change with different strain variables.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Andre Rudnytskyj, Georg Vorlaufer, Josef Leimhofer, Martin Jech, Carsten Gachot
Summary: This study develops a model for estimating the real contact area in hot rolling of a 6061 aluminium alloy based on material properties, roll topography, and lubricant behavior. The results show the interplay between load and contact area, with solid contact and lubricant entrapment playing major roles, influenced by the topography and flow stress of the workpiece.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Physical
Xin F. Tan, Manjin Kim, Qinfen Gu, Julio Pinzon Piraquive, Guang Zeng, Stuart D. McDonald, Kazuhiro Nogita
Summary: This study investigates the effects of Na in hypo-eutectic Mg-lwt.%Si alloys for H-2 storage applications. The addition of trace amounts of Na is vital in improving the H-2 sorption kinetics, achieving a high storage capacity. The study also analyzes the hydrogen sorption mechanisms and identifies the role of Na in facilitating hydrogen diffusion.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Weizhen Wang, Mengmeng Zhang, Zhuoqun Yang, Weiwei Hu
Summary: The dynamic precipitation and microstructural evolution during hot deformation in a Mg-Zn-Gd alloy were investigated through systematic microstructural characterizations. The results showed that the precipitation behavior of different phases in the alloy can be influenced by specific temperature and annealing time, which play an important role in strengthening the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Alexander Epishin, Bettina Camin, Lennart Hansen, Marek Heuser, Inmaculada Lopez-Galilea, Benjamin Ruttert, Werner Theisen, Bernard Fedelich
Summary: In this study, hot isostatic pressing of nickel-base superalloy CMSX-4 was conducted, with porosity annihilation investigated using metallography and X-ray tomography. The experimental results were compared with a vacancy model and further refined to predict pore annihilation kinetics, aiding in the selection of optimal technological parameters.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Tatiana Mishurova, Katia Artzt, Jan Haubrich, Sergei Evsevleev, Alexander Evans, Matthias Meixner, Itziar Serrano Munoz, Igor Sevostianov, Guillermo Requena, Giovanni Bruno
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2020)
Article
Engineering, Manufacturing
G. Requena, K. Bugelnig, F. Sket, S. Milenkovic, G. Roedler, A. Weisheit, J. Gussone, J. Haubrich, P. Barriobero-Vila, T. Pusztai, L. Granasy, A. Theofilatos, J. C. da Silva, U. Hecht
ADDITIVE MANUFACTURING
(2020)
Article
Materials Science, Multidisciplinary
David Canelo-Yubero, Christoph Etzlstorfer, Robert Koos, Holger Germann, Thomas Steffens, Andreas Stark, Elodie Boller, Guillermo Requena
JOURNAL OF MATERIALS SCIENCE
(2020)
Article
Nanoscience & Nanotechnology
Pere Barriobero-Vila, Katia Artzt, Andreas Stark, Norbert Schell, Martin Siggel, Joachim Gussone, Jan Kleinert, Wolfgang Kitsche, Guillermo Requena, Jan Haubrich
SCRIPTA MATERIALIA
(2020)
Article
Chemistry, Physical
Katia Artzt, Tatiana Mishurova, Peter-Philipp Bauer, Joachim Gussone, Pere Barriobero-Vila, Sergei Evsevleev, Giovanni Bruno, Guillermo Requena, Jan Haubrich
Article
Engineering, Mechanical
Eric Breitbarth, Tobias Strohmann, Guillermo Requena
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2020)
Article
Chemistry, Physical
Katia Artzt, Martin Siggel, Jan Kleinert, Joerg Riccius, Guillermo Requena, Jan Haubrich
Article
Materials Science, Multidisciplinary
Joachim Gussone, Katrin Bugelnig, Pere Barriobero-Vila, Julio Cesar da Silva, Ulrike Hecht, Christian Dresbach, Federico Sket, Peter Cloetens, Andreas Stark, Norbert Schell, Jan Haubrich, Guillermo Requena
APPLIED MATERIALS TODAY
(2020)
Article
Engineering, Mechanical
Tobias Strohmann, Denis Starostin-Penner, Eric Breitbarth, Guillermo Requena
Summary: The occurrence of fatigue cracks is a natural part of engineering structures subjected to nonconstant loads, making accurate description of cracks crucial for safety standards. This study successfully implemented a deep convolutional neural network with digital image correlation to detect crack paths and tips, demonstrating accuracy and effectiveness in experiments. Additionally, incorporating synthetic data from finite element analyses improved the detection accuracy of cracks beyond the range of original training data.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Mariana Poliserpi, Pere Barriobero-Vila, Guillermo Requena, Laura Noel Garcia, Alfredo Tolley, Cecilia Poletti, Tomas Vojtek, Adam Weiser, Norbert Schell, Andreas Stark, Roberto Boeri, Silvana Sommadossi
Summary: This study investigates the microstructure and phase transformation process of IN718/Al/IN718 couples bonded by the Transient Liquid Phase Bonding (TLPB) process at different temperatures, revealing the evolution of the AlNi layer over time and the formation of two distinct layers with varying compositions.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Juan Manuel Vallejos, Pere Barriobero-Vila, Joachim Gussone, Jan Haubrich, Klemens Kelm, Andreas Stark, Norbert Schell, Guillermo Requena
Summary: The deformation behavior of Ti-6Al-4V processed by laser powder bed fusion was investigated using in situ high-energy synchrotron X-ray diffraction. The study found that samples oriented at different angles relative to the base plate exhibit varying strength-ductility trade-offs and different activation sequences of deformation mechanisms.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
G. S. Pereira, E. P. Da Silva, G. C. Requena, J. A. Avila, J. R. Tarpani
Summary: The low-cost composite laminate produced by accumulative roll bonding showed significantly enhanced hardness, but only moderately improved tensile properties. This was mainly attributed to some degree of recrystallization, work-hardening relief due to periodic annealing, minimum grain refinement, and somewhat agglomerated carbide particles.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Mechanical
Tatiana Mishurova, Katia Artzt, Birgit Rehmer, Jan Haubrich, Luis Avila, Frederic Schoenstein, Itziar Serrano-Munoz, Guillermo Requena, Giovanni Bruno
Summary: In the absence of tensile residual stress, fatigue life at elevated temperature is primarily controlled by defects; densification has a much stronger effect than considered heat treatments on the improvement of mechanical performance.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Galina Kasperovich, Ralf Becker, Katia Artzt, Pere Barriobero-Vila, Guillermo Requena, Jan Haubrich
Summary: A laser powder bed fusion strategy was developed to manufacture small channels with high dimensional accuracy in Inconel 718 structures. By optimizing the contour parameters and cross-section shape systematically, significant improvement in dimensional accuracy was achieved. Surface quality of external and internal surfaces were investigated, resulting in the best properties for inclinations below 45 degrees.
MATERIALS & DESIGN
(2021)
Article
Metallurgy & Metallurgical Engineering
Erenilton Pereira da Silva, Ricardo Henrique Buzolin, Ulises Alfaro, Guillermo Requena, Haroldo Calvalcanti Pinto
Summary: The microstructure and mechanical properties of butt-joints produced by linear friction stir welding of similar plates of as-cast ZK60 and modified ZK60 with 1.5 wt.% RE (ZK60-1.5RE) were investigated. It was found that there were notable differences in the size of the thermomechanical affected zone between ZK60 and ZK60-1.5RE, with the latter showing a more refined microstructure in the stirred zone. The thermomechanical affected zone exhibited a gradient microstructure with deformed grains progressively more recrystallised towards the stirred zone, indicating the role of twinning, recovery, static, and dynamic recrystallisation during friction stir welding.
JOURNAL OF MAGNESIUM AND ALLOYS
(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.
