Article
Materials Science, Multidisciplinary
Hyeon-Woo Son, Sang-Hwa Lee, Sung-Ho Kang, Yong-You Kim, Kwangjun Euh
Summary: The effect of Ge addition on the delaying natural aging of Al-Mg-Si-Cu alloy was investigated. It was found that Ge addition suppressed the natural aging kinetics and cluster size. Atom probe tomography revealed that Ge refinement of cluster evolution was achieved by disturbing the magnesium enrichment of silicon-silicon clusters and enhancing vacancy trapping. Ge segregation at the cluster interface was also considered as a potential barrier to cluster growth.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Composites
S. Z. Zhu, D. Wang, Y. N. Zan, B. L. Xiao, Z. Y. Ma
Summary: The study successfully developed a new SiCp/Al-2Cu-1.2Mg-0.6Si composite with reduced natural aging strength and increased natural aging ductility, leading to higher yield strength after artificial aging. The new composite enriches the classification of SiCp/Al composites and shows great potential for application.
COMPOSITES COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Yu Fu, Wenlong Xiao, Damon Kent, Jian Rong, Xinqing Zhao, Chaoli Ma
Summary: Natural aging was investigated in a TRIP Ti alloy, resulting in a significant increase in yield strength without sacrificing ductility. This was achieved through decreased particle size, leading to continuous stress-induced β-α' martensitic transformation over a wider range of strains, enhancing both strength and uniform elongation.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Widad Ayadh, Benoit Denand, Ahmed Halkoum, Pascal Boulet, Mohamed Sennour, Jerome Delfosse, Pierre Sallot, Vladimir A. Esin
Summary: Isothermal heat treatments at 876 and 780 degrees C were performed on a Ti2AlNb alloy with varying fraction of a2 phase to study the influence of prior a2 phase on O-phase formation kinetics in /3 matrix. The kinetics of phase transformations were investigated using electric resistivity measurements, scanning and transmission electron microscopy, energy dispersive X-ray spectrometry, and quantitative X-ray diffraction. The results showed that the effect of a2 phase on O-phase formation depends on the transformation temperature. At 876 degrees C, prior a2 precipitates led to slower O-phase formation compared to the a2 free alloy, while at 780 degrees C, the presence of a2 phase accelerated the kinetics of O-phase formation. Diffusion and diffusionless character of O-phase formation in /3 matrix with and without prior a2 were observed at 876 and 780 degrees C, respectively.
Article
Chemistry, Physical
Mariana C. M. Rodrigues, Thomas Garcin, Matthias Militzer
Summary: This study explores the potential of laser ultrasonics for metallurgy (LUMet) as an advanced in-situ technique to measure the alpha formation kinetics in a Ti-5553 alloy. Experimental observations and theoretical models based on the Johnson-Mehl-Avrami-Kolmogorov (JMAK) theory provide insights into transformation kinetics. The consistency between the partial time-temperature-transformation (TTT) diagram and in-situ measurements reaffirms the monitoring capacity of LUMet for microstructure evolution in Ti-alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
S. Y. Li, S. Y. Duan, W. Q. Ming, C. L. Wu, J. H. Chen
Summary: The S-phase is an effective strengthening precipitate in aluminum alloys for aerospace applications. Previous studies have well revealed its precipitation mechanism in AlCuMg alloys. However, this study reports a different scenario of S-phase formation in an AlCuLiMg alloy. By using atomic-resolution imaging in transmission electron microscopy, it is discovered that this alloy can form a precipitate microstructure dominated by Li-containing Guinier-Preston-Bagaryatsky zones and previously unknown S-like phase precipitates. The formation of the S-like precipitate undergoes a structural phase evolution rather than a conventional phase transformation. This study shows that AlCuLiMg alloys can develop a distinct microstructure with S-like/S-phase and T-1-phase precipitates, without the commonly observed delta'/theta'/delta' composite precipitates.
Article
Nanoscience & Nanotechnology
Ying Han, Julius Kruse, Julian M. Rosalie, Jan Radners, Philipp von Hartrott, Birgit Skrotzki
Summary: The fatigue properties of forged aluminum alloy were studied under different stress ratios and aging states. The results showed that overaging significantly reduced the fatigue life of the alloy, which was mainly attributed to the decrease in yield strength and the increase in precipitate radius.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
M. Petrik, Yu N. Gornostyrev, P. A. Korzhavyi
Summary: The study systematically investigated the interactions of alloying elements and vacancies with coherent interfaces of the theta' phase in Al-based alloys, revealing that the presence of vacancies in the interfacial Cu layer plays a crucial role in solute-interface interactions. The solute-interface interaction energies were found to be weaker for elements with closed or empty d-electron shells compared to d-transition metals. The roles of alloying elements and interface structure in the stability of theta' phase precipitates were analyzed in terms of electronic structure and atomic size contributions to interatomic bonding.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Joze Arbeiter, Maja Voncina, Barbara Setina Baltic, Jozef Medved
Summary: The transformation of the Al6Fe metastable phase was analyzed using DSC, optical and SEM, and XRD. A low-impurity alloy was produced in a controlled environment, achieving solidification of the Al6Fe phase with a cooling rate of 35 K/s. Homogenization at 600 degrees C for 2-24 h resulted in the completion of transformation from Al6Fe to Al13Fe4.
Article
Materials Science, Multidisciplinary
Marcio Sangali, Victor C. Opini, Alberto Z. Fatichi, Mariana G. Mello, Leonardo Fanton, Rubens Caram, Alessandra Cremasco
Summary: This study investigates the effects of V replacement with Nb on the microstructure and properties of Ti-5553 and Ti-12553 alloys after aging heat treatment. It was found that the microstructure consisted of precipitates in a b matrix, with larger precipitates at a faster heating rate. The coarsening microstructure resulted in decreased mechanical strength but improved ductility. The replacement of V with Nb and the resulting microstructure did not affect the corrosion resistance of the samples.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
J. Salamania, K. M. Calamba Kwick, D. G. Sangiovanni, F. Tasnadi, I. A. Abrikosov, L. Rogstrom, L. J. S. Johnson, M. Oden
Summary: The defect structures forming during high-temperature decomposition of Ti1-xAlxNy films were investigated through high-resolution scanning transmission electron microscopy. Two types of dislocations, misfit edge dislocations and a/6(112){111} partial dislocations, were found at the interface between TiN-rich and AlN-rich domains. The stacking fault energy associated with the partial dislocations decreases with increasing Al content, facilitating the phase transition of AlN-rich domains. Additionally, intersections of stacking faults were observed at the interface after annealing to 1100 degrees C, contributing to the hardening in Ti1-xAlxNy.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Isai Galindo Aguilar, Jesus Torres Torres, Alfredo Flores Valdes, Alfredo Alan Flores Saldivar
Summary: The present study investigates the effects of temperature and homogenization time on the microstructures and morphologies of intermetallic phases in the 6063 alloy. The results show that increasing temperature and homogenization time leads to a higher percentage of the alpha phase. The kinetic analysis reveals a two-stage transformation process from the beta phase to the alpha phase.
Article
Materials Science, Multidisciplinary
Zhi-Jun Zhao, Xin-Fu Gu, Meng Li, Ming-Le You, Mohan Chen, Fu-Zhi Dai, Zhang-Zhi Shi
Summary: A nano-precipitate of Si-Mg2Si core-shell structure is discovered in Al alloys for the first time. The orientation relationship between the ss-Mg2Si shell and the Si core is predicted by a near row matching model based on interfacial good matching. First-principles calculation reveals that heterogeneous nucleation of Mg2Si on Si is favored due to reduction of nucleation barrier.
Article
Materials Science, Multidisciplinary
Andi Idhil Ismail, Moukrane Dehmas, Elisabeth Aeby-Gautier, Benoit Appolaire
Summary: The phase transformation kinetics of Ti-6Al-4V alloy were investigated during rapid heating, and the study showed that the heating rate had an influence on the phase transformation behavior. Higher heating rates resulted in a higher dissolution temperature range for the α phase and a narrower temperature range for the phase transformation. The stress level and/or chemical heterogeneity in the β phase decreased with time at high temperatures. Despite the high heating rate, the dissolution kinetics of the α phase were still diffusion-controlled.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Xuanliang Chen, Daehan Kim, O. Minho, Calin D. Marioara, Sigmund J. Andersen, Adrian Lervik, Randi Holmestad, Equo Kobayashi
Summary: Pre-deformation has a strong impact on the subsequent age-hardening behavior of the Al-3Mg1Cu alloy, accelerates precipitation, enhances hardness peaks, inhibits cluster formation, and increases the amount of precipitates along dislocation lines. This study's findings are important for the advancement of combined mechanical deformation and heat treatment processes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Thermodynamics
Cameron R. Quick, Phillip Dumitraschkewitz, Juergen E. K. Schawe, Stefan Pogatscher
Summary: The impact of cooling rates on the apparent specific heat capacity of AlSi12 alloy during heating process was investigated using Fast Differential Scanning Calorimetry. The study revealed that the apparent specific heat capacity of AlSi12 alloy decreases after rapid cooling when heated above 400℃, which is highly relevant in metal additive manufacturing.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Physical
Mohammad Taha Honaramooz, Roland Morak, Stefan Pogatscher, Gerhard Fritz-Popovski, Thomas M. Kremmer, Thomas C. Meisel, Johannes A. Oesterreicher, Aurel Arnoldt, Oskar Paris
Summary: Characterizing Zr-containing dispersoids in aluminum alloys is challenging due to their diverse size distribution, low volume fraction, and uneven distribution within the grains. This study compared small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) in characterizing Zr-containing dispersoids. Both scattering techniques were found suitable for characterizing dispersoids in a multi-phase industrial 7xxx series aluminum alloy. SAXS was more sensitive than SANS due to the high electron density of Zr-containing dispersoids, while SANS had the advantage of probing a larger sample volume. The combination of both techniques allowed for distinguishing the contribution of dispersoids from other precipitate phases.
Article
Multidisciplinary Sciences
Nikolaus Papenberg, Thomas Hatzenbichler, Florian Grabner, Peter J. Uggowitzer, Stefan Pogatscher
Summary: Weight reduction is significant in transportation industries as it affects fuel consumption and vehicle range. Different materials are commonly used to take advantage of specific properties, with aluminum alloys used in both cast and wrought states. However, magnesium alloys, which are lighter, are only used in castings. Despite progress in scientific research on magnesium wrought alloys, their industrial implementation is limited, resulting in a lack of safety and structural applications. To promote industrial application and acceptance of these materials, the forging process of an automotive control arm was investigated. By using an age-hardenable Mg-Al-Ca-Zn-Mn lean alloy, which can be processed similarly to AL alloys, the study provides information on forming characteristics and challenges.
SN APPLIED SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Matheus A. Tunes, Stefan Fritze, Barbara Osinger, Patrick Willenshofer, Andrew M. Alvarado, Enrique Martinez, Ashok S. Menon, Petter Strom, Graeme Greaves, Erik Lewin, Ulf Jansson, Stefan Pogatscher, Tarik A. Saleh, Vladimir M. Vishnyakov, Osman El-Atwani
Summary: High-entropy materials have emerged as the cutting-edge strategy for alloy design in extreme environments. Recent research indicates that high-entropy alloys (HEAs) demonstrate excellent radiation resistance compared to conventional alloys due to the suppression of damage formation and evolution. This paper presents the extension of the high-entropy concept to novel high-entropy ceramics (HECs) for applications in environments with energetic particle irradiation. The synthesized HEC in the CrNbTaTiW quinary refractory system exhibits nanocrystalline grains, single-phase crystal structure, and approximately 50 at.% carbon content. In-situ transmission electron microscopy was used to evaluate the irradiation response of HEC and compare it with HEA. Both materials showed no displacement damage effects up to a dose of 10 displacements-per-atom, and surprisingly, HEC did not amorphize under the investigated conditions. Implantation of Xe in both materials resulted in the nucleation of bubbles, but smaller sizes compared to conventional nuclear materials, indicating their potential as candidates for nuclear energy applications.
Article
Materials Science, Multidisciplinary
O. M. Prada Ramirez, T. M. Kremmer, J. H. Marin, B. P. da Silva, M. Starykevich, M. A. Tunes, M. G. S. Ferreira, I. V. Aoki, R. A. Ando, S. Pogatscher, H. G. de Melo
Summary: The corrosion resistance of the AA2024-T3 alloy can be significantly improved by using top protective sol-gel hybrid organic-inorganic coatings. Samples with Ce nanoparticles incorporated in the anodic layer pores displayed better performance compared to samples with only the coating. This research reveals the self-healing capability against corrosion of the sol-gel coating in the presence of Ce nanoparticles, as well as the good coverage of defective regions within the oxide by the hybrid layer. It opens up a new paradigm in maximizing the corrosion resistance for non-ferrous anodized alloys.
Article
Nanoscience & Nanotechnology
Milad Roostaei, Peter J. Uggowitzer, Reinhard Pippan, Oliver Renk
Summary: The attractive properties of Mg-bcc nanocomposites have gained increasing interest, but bulk fabrication has been unsuccessful due to strain localization within the Mg-phase. Through high-pressure torsion, the deformation behavior and resulting microstructures of Mg-Fe composites were analyzed at different applied strains and processing temperatures. Surprisingly, processing at 73% of Mg's melting point accelerated microstructural refinement and improved homogeneity, leading to a three-fold increase in hardness compared to ambient processing. This suggests that further optimization could potentially create Mg-based materials with strength beyond a gigapascal.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Sebastian Samberger, Irmgard Weissensteiner, Lukas Stemper, Christina Kainz, Peter J. Uggowitzer, Stefan Pogatscher
Summary: This study presents age-hardenable, fine-grained AlMgZnCu crossover alloys intended for superplastic and quick plastic forming processes. These alloys utilize T-phase (Mg32(Al,Zn)49) to refine the grain structure and increase age-hardening. The study demonstrates the importance of particle stimulated nucleation (PSN) using T-phase particles, which leads to a fine grain size as low as 4 μm. The resulting alloys have excellent high-temperature forming properties and high stability.
Article
Materials Science, Multidisciplinary
Bernhard Trink, Irmgard Weissensteiner, Peter J. Uggowitzer, Katharina Strobel, Anna Hofer-Roblyek, Stefan Pogatscher
Summary: This study introduces new alloys that combine the age-hardening capability of Al-Mg-Si alloys with the microstructure-controlling effect on processing of primary Fe-rich intermetallic phases used in foil stock. Processing and microstructure-property relations in new crossover aluminum alloys derived from 6xxx and 8xxx foil stock alloys are shown. The study demonstrates the attractive combinations of strength and ductility achieved in these new alloys.
Article
Engineering, Mechanical
D. Schimbaeck, L. Kaserer, P. Mair, F. Palm, G. Leichtfried, S. Pogatscher, A. Hohenwarter
Summary: This paper aims to unveil the impact of unique bimodal microstructure on the quasi-static tensile and fatigue properties of Scalmalloy (R). The study reveals that Scalmalloy (R) has a higher fatigue strength compared to its additively manufactured aluminum counterparts, reaching levels comparable to additively manufactured Ti-6Al-4V.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Biochemical Research Methods
Diego S. R. Coradini, Matheus A. Tunes, Patrick Willenshofer, Sebastian Samberger, Thomas Kremmer, Phillip Dumitraschkewitz, Peter J. Uggowitzer, Stefan Pogatscher
Summary: The present study demonstrates a methodology for in situ investigation of nanoalloying using metallic nanomaterials as reactants within a transmission electron microscope. The method can be used as a starting point for studying nanometallurgy and subsequent alloying of materials. The results showed that both Au and Cu nanomaterials could alloy with Al when melted in the transmission electron microscope. Overall, these results suggest that transmission electron microscope-based in situ melting and alloying is a valuable technique for studying the metallurgical processing of nanomaterials.
Article
Materials Science, Multidisciplinary
Philip Aster, Phillip Dumitraschkewitz, Peter J. Uggowitzer, Florian Schmid, Georg Falkinger, Katharina Strobel, Peter Kutlesa, Michael Tkadletz, Stefan Pogatscher
Summary: This study investigated the formation of solute clusters and their contribution to strain hardening in aluminum alloys by using APT and tensile testing. The results showed that clusters could form during plastic deformation, which was referred to as strain-induced clustering.
Article
Materials Science, Multidisciplinary
P. D. Willenshofer, M. A. Tunes, C. Kainz, O. Renk, T. M. Kremmer, S. Gneiger, P. J. Uggowitzer, S. Pogatscher
Summary: This study investigates the precipitation behavior of the T-phase in crossover aluminium alloys, revealing that the ultrafine-grained alloy exhibits different and accelerated precipitation behavior compared to the coarse-grained alloy. Moreover, the ultrafine-grained alloy shows high resistance to grain growth during heating, primarily attributed to the synergistic effect of inter-granular and trans-granular precipitation of T-phase.
MATERIALS RESEARCH 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.