Article
Electrochemistry
Yuliya Yapontseva, Valeriy Kublanovsky, Tetyana Maltseva, Oksana Gorobets, Rostislav Gerasimenko, Yuri Troshchenkov, Oleksii Vyshnevskyi
Summary: This paper investigates the effect of applying and directing a constant magnetic field on the electrodeposition and magnetic properties of refractory metal alloys (W, Mo, Re) with cobalt from citrate-pyrophosphate electrolytes. The study finds that the magnetic field has the greatest influence on the electrodeposition of rhenium alloys, resulting in a decrease in rhenium content and halving of crystallite sizes.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
T. K. Akopyan, N. A. Belov, A. A. Lukyanchuk, N. V. Letyagin, T. A. Sviridova, A. N. Petrova, A. S. Fortuna, A. F. Musin
Summary: The research found that high pressure torsion processing can lead to the formation of a nanocrystalline structure in the Al3Ca2La1.5Mn alloy, significantly increasing the microhardness of the alloy. After annealing treatment, the microhardness of the alloy further increases, attributed to precipitation hardening resulting from the decomposition of the calcium and manganese supersaturated aluminum solid solution.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Katey N. Thomas, Gary S. Was
Summary: Samples of a Fe-15Cr model alloy were irradiated with different particles to study the stability of a' precipitates. Results showed that electron and proton irradiation increased the size and Cr content of a' precipitates, but at different rates due to the influence of ballistic dissolution. Self-ion irradiation caused a reduction in the size and Cr content of a' precipitates, and above a certain damage rate, the precipitates were completely dissolved. Cascade size strongly determines the stability of a' precipitates, while damage rate affects their growth and dissolution rate.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yajie Zhao, Arunodaya Bhattacharya, Cristelle Pareige, Caleb Massey, Pengcheng Zhu, Jonathan D. Poplawsky, Jean Henry, Steven J. Zinkle
Summary: The kinetics of CrRP formation due to particle irradiation were investigated, and it was found that the formation of CrRP can be suppressed under certain irradiation conditions. The distribution of CrRP after irradiation was analyzed using atom probe tomography (APT), and a radiation modified precipitation mechanism was proposed to explain the evolution of CrRP.
Article
Materials Science, Multidisciplinary
Jae-Gil Jung, Amir R. Farkoosh, David N. Seidman
Summary: The precipitation behavior of two L1(2)-strengthened alloys with Mg and Y additions was studied. It was found that Si-added alloy forms beta-Mg2Si precipitates at around 200 degrees C, which act as nucleation sites for the L1(2)-nanoprecipitates and cause partial depletion of Si solute atoms, resulting in a microhardness peak at 475 degrees C. The Si-free alloy has superior creep properties due to a larger lattice parameter mismatch of the L1(2)-nanoprecipitates with the Al matrix provided by higher Sc/Er/Y concentrations. Both alloys exhibit slower L1(2) nanoprecipitation-kinetics and extremely high coarsening resistance.
Article
Materials Science, Multidisciplinary
R. Badyka, S. Saillet, J. Emo, C. Domain, C. Pareige
Summary: During ageing, the ferritic phase of Cast Austenitic Stainless Steels undergoes decomposition by spinodal decomposition and G-phase precipitation. The addition of Ni affects the spinodal decomposition kinetics, while Mo and Mn additions promote the precipitation of G-phase in the microstructure evolution.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Jonathan D. Poplawsky, Rishi Pillai, Qing-Qiang Ren, Andrew J. Breen, Baptiste Gault, Michael P. Brady
Summary: Understanding the oxygen solubility in materials is crucial for designing oxidation resistant alloys. Atom Probe Tomography (APT) provides high chemical sensitivity and resolution, revealing the oxygen content within Ni metal and grain boundaries.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Fan Lu, Stoichko Antonov, Song Lu, Jiachen Zhang, Longfei Li, Dong Wang, Jian Zhang, Qiang Feng
Summary: This study investigates the microstructural stability of two single crystal superalloys with different Re addition during long-term thermal exposure. The results show that the addition of Re can effectively decrease the coarsening rate and enhance the microstructural stability of the alloys.
Article
Nanoscience & Nanotechnology
P. Maugis, M. Jouiad, F. Roch, C. Perrin-Pellegrino, K. Hoummada
Summary: Experimental and modeling studies on carbon and nitrogen segregation to dislocations in C-Mn ferritic steels were reported. A model based on McLean theory was established to describe the competitive segregation of carbon and nitrogen in the Cottrell atmospheres around dislocations, taking into account the effect of dislocation density. It was found that the plastic strain during tensile test can modify the material properties by changing the nature and quantity of segregated atoms around dislocations, leading to a preferential segregation of nitrogen over carbon.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Jing Wang, Yuji Hatano, Takeshi Toyama, Tatsuya Hinoki, Kiyohiro Yabuuchi, Yi-fan Zhang, Bing Ma, Alexander V. Spitsyn, Nikolay P. Bobyr, Koji Inoue, Yasuyoshi Nagai
Summary: This study systematically investigates the irradiation responses of binary W alloys, focusing on the binding energy of an alloying element with a W self-interstitial atom (W-SIA). Plates of W, W-0.3 at.% Cr, W-5 at.% Re, W-2.5 at.% Mo, and W-5 at.% Ta alloys were irradiated, and the formation of vacancy-type defects, the precipitation of alloying elements, and the changes in hardness were studied. It was found that the addition of Cr and Re effectively suppresses the formation of vacancy-type defects, while Ta and Mo have no significant suppression effect. Irradiation hardening was observed in all materials, but its degree was smaller in the W-5 at.% Re alloy.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Iman Taji, Tarlan Hajilou, Anna Sophie Ebner, Daniel Scheiber, Shabnam Karimi, Ernst Plesiutschnig, Werner Ecker, Afrooz Barnoush, Verena Maier-Kiener, Roy Johnsen, Vsevolod I. Razumovskiy
Summary: This study aims to improve the hydrogen embrittlement resistance of Alloy 725 through minor alloying modifications. The results show that Mod B alloy exhibits superior resistance to hydrogen embrittlement compared to Mod A alloy by facilitating grain boundary dislocation transfer and generation. Mod C alloy, with the addition of Cu, forms nanovoids in the grain boundaries, but still maintains good resistance to hydrogen embrittlement.
Article
Nanoscience & Nanotechnology
S. A. Mantri, S. Dasari, A. Sharma, Y. Zheng, H. L. Fraser, R. Banerjee
Summary: The formation and influence of isothermal phase precipitates in a metastable beta-titanium alloy, Ti-10V-2Fe-3Al, is investigated. It is found that the rejection of Al from the growing isothermal precipitates aids in their formation. The presence of alpha/omega and alpha/beta interfaces confirms that the alpha precipitates form at the beta/omega interface. Subsequent annealing at a higher temperature dissolves the precipitates and re-establishes the two-phase beta+alpha equilibrium.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Young Mok Kim, Sangwon Lee, Ki Jeong Kim, Tae Jin Jang, Hyeon-Seok Do, Kyuseon Jang, Won Seok Choi, Min-Gu Jo, Byeong-Joo Lee, Pyuck-Pa Choi, Seok Su Sohn
Summary: In this study, Mo is used to generate strengthening phases and expand the region of a face-centered cubic (FCC) solid-solution phase at lower temperatures in the equiatomic VCoNi alloy. The substitution of Mo successfully adds a homogeneous L12 phase to provide strengthening effects and overcomes the limitations of the VCoNi alloy, but appropriate heat treatment is required to prevent brittleness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Zipeng Shi, Renhua He, Yang Chen, Hong Yan, Honggun Song, Chao Luo, Qiao Nie, Zhi Hu
Summary: A novel high-strength, ductile, and low-cost Al-11Si-3Cu alloy microalloyed with minor Sr + Sc was developed in this study, which showed improved mechanical properties compared to other Al-Si-(Cu) alloys. Atom probe tomography revealed the microstructure of the alloy and the strengthening mechanisms were discussed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Yu Xia, Jiaming Liu, Xingchu Zhang, Renlong Zhou
Summary: Research findings show that laser energy absorption and field evaporation mechanisms can be described by an effective cross section, while the fluctuation of charge state is influenced by collective excitation of electrons. The average charge state is only dependent on the static field strength.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Nanoscience & Nanotechnology
Kamal Nayan Goswami, Alessandro Mottura
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Materials Science, Multidisciplinary
Lucia Scotti, Nils Warnken, Alessandro Mottura
Article
Materials Science, Multidisciplinary
J. W. Aveson, G. Reinhart, C. J. L. Goddard, H. Nguyen-Thi, N. Mangelinck-Noel, A. Tandjaoui, J. R. Davenport, N. Warnken, F. Di Gioacchino, T. A. Lafford, N. D'Souza, B. Billia, H. J. Stone
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
T. D. Reynolds, D. M. Collins, N. K. Soor, S. R. Street, N. Warnken, P. M. Mignanelli, M. C. Hardy, H. E. Evans, M. P. Taylor
Article
Nanoscience & Nanotechnology
T. Nelson, B. Cai, N. Warnken, P. D. Lee, E. Boller, O. Magdysyuk, N. R. Green
SCRIPTA MATERIALIA
(2020)
Article
Materials Science, Multidisciplinary
E. R. M. Davidson, T. Daff, G. Csanyi, M. W. Finnis
PHYSICAL REVIEW MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Angeliki Poulou, Thomas A. Mellan, Michael W. Finnis
Summary: The study calculated the stability of Zr and Ti-based MAX phases at different temperatures using density functional theory, finding that Zr-based MAX phases decompose below room temperature, while Ti2AlC phase is stable at room temperature.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Chemistry, Physical
Dimitra Spathara, Dmitry Sergeev, Dietmar Kobertz, Michael Mueller, Duncan Putman, Nils Warnken
Summary: Research on second and third generation single crystal Ni-based superalloys found that their thermodynamic properties and stability at high temperatures are crucial. Vapor composition and activities of Ni, Co, Cr, and Al were determined using Knudsen Effusion Mass Spectrometry, while phase transition temperatures were measured using Differential Scanning Calorimetry. Back-scattered Electron Imaging and Energy Dispersive Spectroscopy depicted the effects of complex multicomponent systems post KEMS.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Editorial Material
Materials Science, Ceramics
A. H. Heuer, M. W. Finnis, W. M. C. Foulkes, A. P. Chen
Summary: This paper comments on recent observations of O and Al self-diffusion in single-crystal sapphire with variable doping concentrations of Mg and Ti. The study suggests that the null effect of aliovalent doping on oxygen diffusivity may be attributed to dopant evaporation near the surface due to extensive heat treatment, whereas an effect on Al diffusivity is still discernible. Furthermore, buffering mechanisms are proposed to be ultimately responsible for modest increases of self-diffusion with respect to dopant concentrations.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Andy Paul Chen, W. M. C. Foulkes, Arthur H. Heuer, Michael W. Finnis
Summary: The puzzle of why the enhancement of oxygen diffusion in alpha-Al2O3 is much less than expected with an increase in Mg doping has been perplexing for over two decades. In this study, the researchers conducted a detailed investigation of point defects and defect clusters in Mg-doped alpha-Al2O3. By considering defect formation energies, charge neutrality, and environmental parameters, they were able to explain the anomalous trend in oxygen diffusivities. Their findings revealed a nonlinear relationship between Mg concentration and key native point defects, which explains the previously observed anomaly in oxygen diffusion in alpha-Al2O3.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Andy Paul Chen, Arthur H. Heuer, Michael W. Finnis, W. M. C. Foulkes
Summary: It has been found that adding reactive elements can improve oxidation resistance in high-temperature alloys. However, the specific mechanism for reducing scale growth rate is still unclear. This study used density functional theory to investigate the structural and electronic properties of grain boundaries containing substitutional defects of Y, Hf, and Zr. The results suggest that the substitutional defects indirectly reduce scale growth rate by lowering electron density and grain boundary electronic conductivity.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Physical
Amanda Diez Fernandez, Patrick Charchar, Andrey G. Cherstvy, Ralf Metzler, Michael W. Finnis
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
D. Korbmacher, A. Glensk, A. Duff, M. W. Finnis, B. Grabowski, J. Neugebauer
Article
Engineering, Manufacturing
Richard Turner, Jeff Antonic, Nils Warnken
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2019)
Article
Materials Science, Multidisciplinary
Thomas A. Mellan, Andrew Duff, Blazej Grabowski, Michael W. Finnis
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.
