Article
Materials Science, Multidisciplinary
Z. H. Wang, B. Niu, Q. Wang, C. Dong, J. C. Jie, T. M. Wang, T. G. Nieh
Summary: The newly designed ultrastrong MSS exhibits extremely high ultimate tensile strength and decent uniform elongation, offering a new pathway for developing high-performance MSSs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Staffan Hertzman, Reza Naraghi, Sten Wessman, Rachel Pettersson, Ulrika Borggren, Jan Y. Jonsson, Niklas Hollander Pettersson, Mina Khoda Karami, Ali Kohan-Zade
Summary: Adding nitrogen to high-performance stainless steels improves strength, corrosion resistance, and weldability. Reliable databases are crucial for developing new stainless steels. A series of experiments were conducted to calibrate existing thermodynamic data, with results compared to equilibrium calculations.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
M. C. Niu, K. Yang, J. H. Luan, W. Wang, Z. B. Jiao
Summary: Control of the formation and stability of reverted austenite is critical in achieving a favorable combination of strength, ductility, and toughness in high-strength steels. The effects of Cu precipitation on the austenite reversion and mechanical properties of maraging stainless steels were investigated. Cu accelerates the austenite reversion kinetics by increasing the equilibrium austenite fraction and serving as heterogeneous nucleation sites. Cu precipitation hardening compensates the strength drop induced by the formation of soft reverted austenite.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Jialong Tian, Wei Wang, Huabing Li, Ke Yang, Zhouhua Jiang
Summary: The microstructure and high cycle fatigue property of maraging stainless steels with Ti addition were studied. The crack initiation mechanism in HCF depends on the value of normalized applied stress, where high NAS is controlled by yield strength dominated by nano-size precipitates and low NAS is controlled by the distance between TiN inclusion and specimen surface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Mehdi Sanjari, Mahdi Mahmoudiniya, Hadi Pirgazi, Saeed Tamimi, Mohammad Hossein Ghoncheh, Ayda Shahriairi, Amir Hadadzadeh, Babak Shalchi Amirkhiz, Mackenzie Purdy, Edgar Gomes de Araujo, Leo Kestens, Mohsen Mohammadi
Summary: The effect of building orientation on the microstructure, texture, and mechanical properties of a low carbon maraging steel processed by selective laser melting (SLM) technique is studied in this research. It is observed that changing the building orientation from vertical to horizontal alters the grain morphology and results in a higher volume fraction of austenite, leading to higher strength and better ductility in the horizontally printed sample. The crystallographic texture does not significantly affect the tensile properties, which are mainly influenced by grain size, retained austenite, and stress concentration conditions.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Peng-Chong Lu, Hua-Bing Li, Hao Feng, Zhou-Hua Jiang, Hong-Chun Zhu, Zhuang-Zhuang Liu, Tong He
Summary: This study systematically investigated the formation mechanism of AlN inclusions in high-nitrogen stainless bearing steels, finding that the concentration product of Al and N exceeding the critical solubility can lead to their formation. The precipitation of Cr2N and the low diffusion coefficient of Al in the alpha phase restrict the precipitation of AlN during annealing, while AlN and AlN-MnS composite inclusions can precipitate during austenitizing.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Luhai Liao, Zhengxiang Zhao, Fanghong Xu, Wei Zhang, Jingyuan Li
Summary: The precipitation behavior and transformation kinetics of secondary phases in super austenitic stainless steels with different nitrogen contents were investigated. The results showed that increasing the nitrogen content did not lead to the refinement of sigma precipitates. Instead, a lower nitrogen content resulted in more uniform precipitation. Furthermore, increasing the nitrogen content did not accelerate the precipitation of the Cr2N phase. The higher sigma transformation fraction in the alloy with 0.4wt.% N promoted the precipitation of nitrides. The data obtained from the experiments were in good agreement with the model used to describe the transformation kinetics.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Michella Alnajjar, Frederic Christien, Cedric Bosch, Krzysztof Wolski, A. Dominic Fortes, Mark Telling
Summary: Bulk phase transformations and dislocation density were examined in maraging stainless steel at high temperatures using in-situ neutron diffraction. The study revealed the impact of steel composition on the amount of delta-ferrite at the melting point, while the initial microstructure had little influence on re-austenization process. Dislocation densities were found to vary among different materials, with dislocations starting to annihilate at temperatures above 550 degrees C.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Shixing Chen, Jingchuan Zhu, Tingyao Liu, Yong Liu, Yudong Fu, Toshihiro Shimada, Guanqi Liu
Summary: This paper mainly studied the integrated computational materials engineering using database technology, machine learning, thermodynamic calculation, and experimental verification. The interaction between alloying elements and precipitated phases in martensitic ageing steels were investigated. Machine learning was applied for modeling and parameter optimization, achieving a prediction accuracy of 98.58%. The influence of composition fluctuation on performance and the influence of elements from multiple perspectives were analyzed through correlation tests. Thermodynamic calculations studied the effect of alloying element content on the nano-precipitation phase, Laves phase, and austenite. New steel grade heat treatment parameters were developed based on phase diagram, and a martensitic ageing steel with excellent mechanical properties was prepared.
Article
Materials Science, Multidisciplinary
Mujin Yang, Daniel J. M. King, Ivan Postugar, Yuren Wen, Junhua Luan, Bernd Kuhn, Zengbao Jiao, Cuiping Wang, M. R. Wenman, Xingjun Liu
Summary: A series of G-phase strengthened ferritic stainless steels Fe-20Cr-3Ni-3Si-X were characterized after aging, showing sluggish precipitation of Ni16Mn6Si7 G-phase and early precipitation of superfine Ni16Mn6Si G-phase in the Ti containing alloy. The G-phases exhibited particle coarsening without chemical composition evolution up to 96 h of aging, while a significant hardness increase was observed. The findings provide valuable insight for developing future high strength steels.
Article
Materials Science, Multidisciplinary
Jialong Tian, Gang Zhou, Wei Wang, Qingmiao Hu, Zhouhua Jiang, Ke Yang
Summary: The effect of cobalt on the precipitation hardening behavior of maraging stainless steels was investigated. It was found that cobalt addition could increase peak hardness and accelerate the aging process, as well as enhance the density of precipitates, leading to a stronger contribution to precipitation hardening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
M. C. Niu, C. J. Chen, W. Li, K. Yang, J. H. Luan, W. Wang, Z. B. Jiao
Summary: Understanding the solute interaction effects on grain boundary segregation, precipitation, and fracture of Fe-Ni-Ti-(Mo) maraging steels is crucial for the development of improved steel performance. The addition of Mo effectively suppresses intergranular embrittlement by reducing the segregation of Ni and Ti, inhibiting the formation of coarse Ni3Ti precipitates and precipitate-free zones at grain boundaries, and enhancing grain boundary cohesion.
Article
Nanoscience & Nanotechnology
Tadashi Furuhara, Yongjie Zhang, Mitsutaka Sato, Goro Miyamoto, Masanori Enoki, Hiroshi Ohtani, Tokuteru Uesugi, Hiroshi Numakura
Summary: This research reveals the method of controlling nanoscale dispersion of alloy carbides/nitrides in high-strength steels and emphasizes the importance of interstitial sublattice engineering for the strengthening of alloyed steels.
SCRIPTA MATERIALIA
(2023)
Article
Metallurgy & Metallurgical Engineering
Xinlei Zhou, Bin Wang, Tianyi Zeng, Wei Yan, Junhua Luan, Wei Wang, Ke Yang, Zengbao Jiao
Summary: The effect of pre-deformation on nanoscale precipitates and hardness of a maraging stainless steel was studied. The results showed that pre-deformation can increase the hardness and shorten the incubation time of precipitates.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Vahid A. Hosseini, Kjell Hurtig, Daniel Gonzalez, James Oliver, Nicklas Folkeson, Mattias Thuvander, Kristina Lindgren, Leif Karlsson
Summary: The complex precipitation behavior of Cu-rich particles (CRPs) in continuously cooled and quench-aged super duplex stainless steel was investigated and simulated. Different precipitation patterns were observed based on cooling rates, with slow cooling leading to nonuniform multimodal CRP precipitation and spinodal decomposition, while fast cooling resulted in more uniform precipitation of CRPs. Cu depletion in the ferrite next to CRPs during growth was observed, indicating Cu diffusion to austenite. By comparing analysis from APT and simulation, the effective Cu diffusion coefficient during early-stage precipitation was found to be significantly higher than the Cu diffusion coefficient in ferrite. The study highlights the factors contributing to the complexity of CRP precipitation in duplex stainless steels, including the nonuniform distribution of Cu in ferrite, duplex structure, and partitioning of alloying elements among phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Alejandro Basso, Adriana Eres-Castellanos, Nicolas Tenaglia, David San-Martin, Jose Antonio Jimenez, Francisca G. Caballero
Summary: The bainitic microstructures in high-carbon and high-silicon cast steel are influenced by the heterogeneous distribution of silicon, manganese, and chromium, as well as the transformation kinetics at different temperatures. Higher transformation temperatures result in higher amounts of residual austenite and martensite, impacting the mechanical properties of the material. The ultra-fine microstructure developed at 280 degrees Celsius shows high tensile and yield stress values but limited ductility.
Article
Materials Science, Multidisciplinary
David San-Martin, Matthias Kuntz, Francisca G. Caballero, Carlos Garcia-Mateo
Summary: Increasing prior austenite grain size up to 70 μm leads to an increase in bainite nucleation rate, however, overall transformation kinetics seem to be weakly affected by the applied heat treatment.
Article
Engineering, Civil
Hadi Torkamani, Shahram Raygan, Carlos Garcia Mateo, Yahya Palizdar, Jafar Rassizadehghani, Javier Vivas, David San-Martin
Summary: By decreasing the IHT temperature, the volume fraction of martensite in DP steel decreases while the block size becomes smaller, leading to an increase in hardness but limited impact on material strength and hardness.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
David De-Castro, Adriana Eres-Castellanos, Javier Vivas, Francisca G. Caballero, David San-Martin, Carlos Capdevila
Summary: This study investigates the evolution of two different bainite morphologies in a low carbon microalloyed steel through different heat treatments. Advanced crystallographic characterization and quantitative metallography techniques were employed to analyze the differences in size and shape of the M/A constituents. The results show that the variations in crystallography and morphology can be explained by the different driving forces and amounts of bainitic ferrite formed at different temperature ranges.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Guohua Zhao, Xin Xu, David Dye, Pedro E. J. Rivera-Diaz-del-Castillo, Nik Petrinic
Summary: This study reported a method to deploy transformation-mediated strengthening in titanium alloys by supervised activation of TRIP and TWIP through mechanism-driven modelling, improving the mechanical properties of materials. By developing new alloys, notable resistance to strain localization was achieved, along with significant strain-hardening effects.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Hossein Eskandari Sabzi, Xiao-Hui Li, Chi Zhang, Hanwei Fu, David San-Martin, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: Nanotwin formation in austenitic stainless steels during laser powder bed fusion (LPBF) was observed, with the nature of such twins revealed using transmission electron microscopy. Dynamic recrystallization (DRX) was activated and induced by deformation nanotwins in LPBF. A thermostatistical model was proposed, validated, and offers a method for microstructurally engineering austenitic stainless steels for applications requiring high strength and ductility.
SCRIPTA MATERIALIA
(2022)
Article
Metallurgy & Metallurgical Engineering
Roberto Iquilio Abarzua, Eliseo Hernandez-Duran, Tuan Nguyen-Minh, Leo A. Kestens, Jose Luis Valin Rivera, Felipe M. Castro Cerda
Summary: This study investigated the influence of microstructure on principal strain paths during the formability processes of ferritic stainless steel AISI 430 sheets. The Marciniak test and digital image correlation technique were used to determine forming limit curves and strain levels, with discussion on formability in relation to microstructure, mechanical properties, work hardening behavior, and anisotropy measurements. The texture evolution was examined using electron backscatter diffraction analysis, showing distinct texture components under different strain modes.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Engineering, Mechanical
X. Z. Liang, P. E. J. Rivera-Diaz-del-Castillo
Summary: This study investigates the influence of hydrogen on microstructural alterations in components subjected to rolling contact fatigue (RCF). A dislocation-assisted carbon migration model is developed to describe the formation of hydrogen-influenced microstructural alterations. The experimental results confirm the effectiveness of the model.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Jianwei Zhao, Quan Yang, Hossein Eskandari Sabzi, Wei Wen, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: Stress relaxation after hot deformation is modeled by considering various physical phenomena, including dislocation recovery, recrystallization, and precipitation. The model incorporates new formulations, such as a vacancy-mediated dislocation climb approach for dislocation recovery. The softening behavior of 6 microalloyed steel grades is tracked and compared with experimental data. The approach is also discussed for its application in additive manufacturing microstructural relaxation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
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
Chemistry, Physical
Hao Xiang, Wim Van Paepegem, Leo A. Kestens
Summary: In this study, the Phenomenological Theory of Martensitic Transformation (PTMT) and phase field simulation were used to investigate the martensitic transformation of Ti-6Al-4V alloy. The results showed that mechanical constraints played a crucial role in the microstructure evolution, and the formation of a triangular morphology was favored.
Article
Nanoscience & Nanotechnology
Hossein Eskandari Sabzi, Xiao-Hui Li, Chi Zhang, Hanwei Fu, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: A modelling approach is used to study the deformation mechanisms of 316L stainless steel produced by laser powder bed fusion (LPBF). The study reveals intrinsic differences in deformation behavior between LPBF builds and wrought alloys, which are thought to be caused by the presence of residual stress promoting dislocation recovery.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Hao Yu, Shoukui Yang, Jianfeng Shao, David San-Martin, Wei Xu
Summary: For ferritic self-healing (FSH) steel, the low healing efficiency problem has been addressed by proposing an offline healing treatment that stimulates the formation of Laves phase precipitates as self-healing agents. The treatment extended the creep lifetime by more than 30% and reduced the creep rates by one order of magnitude. The relationship between the extended lifetime and filling ratios of creep cavities by the healing agents was established, providing a new strategy for cultivating the self-healing capabilities of heat resistant steels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Feiyu Zhao, Lucia Morales-Rivas, Qian Yu, Guodong Wang, Francisca G. Caballero, David San-Martin
Summary: The reasons for the limited impact toughness of medium manganese, medium carbon carbide-free bainitic steels are discussed in this paper. Different hot-rolling schedules were used to obtain microstructures with three different prior austenite grain sizes: coarse, medium, and fine grain sizes. The impact toughness of the medium grain size microstructure improved significantly due to the lower ductile-to-brittle transition temperature, compared to the coarse and fine grain size microstructures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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.
