Article
Chemistry, Physical
Changshan Zhou, Hezhi Zhang, Xudong Yuan, Kaikai Song, Dan Liu
Summary: This study validates the applicability of pre-plastic deformation (PPD) on bulk metallic glasses (BMGs) with different Poisson's ratios. It is found that PPD treatment can effectively produce multiple shear bands in BMGs with high Poisson's ratios, leading to improved strength and plasticity. However, for BMGs with low Poisson's ratios, PPD treatment results in only a few shear bands and micro-cracks, leading to worsening mechanical properties. Furthermore, among the PPD-treated BMGs with similar high Poisson's ratios, Zr56Co28Al16 BMG exhibits larger plasticity due to the presence of more defective icosahedral clusters, which serve as nucleation sites for shear transformation zones (STZs) during deformation.
Article
Materials Science, Multidisciplinary
S. J. Wu, Z. Q. Liu, R. T. Qu, Z. F. Zhang
Summary: By establishing quantitative correlations among compositions, elastic constants, GFA, and mechanical properties of metallic glasses (MGs), it is possible to predict their performance in advance. Experimental data confirms the validity of this predictive approach. A strategy for designing MGs with optimal combinations of strength, toughness, and GFA is proposed to allow for high-throughput discovery of glass formers with excellent mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Mechanical
K. Tao, V. A. Khonik, J. C. Qiao
Summary: In this study, the effects of the structural energy states of Zr50Cu40Al10 metallic glass on its performance were investigated using depth-sensing nanoindentation. The shear transformation zone volume of the relaxed metallic glass is larger than that of as-cast one, while the strain rates sensitivity displays the opposite tendency. The plastic deformation in the creep stage of nanoindentation originates from the delayed plasticity inherited from the loading process. The creep depth shows strain rates and microstructural states dependence.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Physical
Y. S. Luo, J. J. Li, Z. Wang, M. Zhang, J. W. Qiao
Summary: Based on a simple mean-field model, two distinct types of slip avalanches in serrated plastic flows of bulk metallic glasses were identified to differentiate the slipping modes of shear bands under various strain rates. Small avalanches propagate progressively, while large avalanches follow a simultaneous propagation. By defining a weakening parameter and critical size, researchers were able to characterize the completely disparate shearing modes, with larger weakening and lower critical sizes indicating more activated shear transformation zones, offering a new method to explore plasticity in bulk metallic glasses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Monika Antoni, Florian Spieckermann, Niklas Plutta, Christoph Gammer, Marlene Kapp, Parthiban Ramasamy, Christian Polak, Reinhard Pippan, Michael J. J. Zehetbauer, Juergen Eckert
Summary: The effects of severe plastic deformation (SPD) by means of high-pressure torsion (HPT) on Fe73.9Cu1Nb3Si15.5B6.6 and Fe81.2Co4Si0.5B9.5P4Cu0.8 iron-based metallic glasses were compared. HPT processing extended the consolidation and deformation ranges for Fe73.9Cu1Nb3Si15.5B6.6, and achieved consolidation and deformation with minimum cracks for Fe81.2Co4Si0.5B9.5P4Cu0.8 for the first time. Various analyses revealed that Fe81.2Co4Si0.5B9.5P4Cu0.8 exhibited HPT-induced crystallization phenomena, while Fe73.9Cu1Nb3Si15.5B6.6 did not crystallize even at high HPT-deformation degrees.
Article
Nanoscience & Nanotechnology
J. H. Yu, L. Q. Shen, D. Sopu, B. A. Sun, W. H. Wang
Summary: The study provides an intuitive interpretation for the critical growth of an atomic-scale plastic flow unit in metallic glasses through an energy conversion approach. It is found that the growth of the atomic units is a competition process between intrinsic configurational entropy change and the constraint effect of the glassy matrix on the inelastic deformation of the plastic flow unit. At the yielding point, the activation of a plastic flow unit should take the easiest path in the potential energy landscape, with the intrinsic configurational entropy change and the elastic constraint effect contributing equally to the activation energy barrier.
SCRIPTA MATERIALIA
(2021)
Article
Physics, Multidisciplinary
Hui Wang, Wojciech Dmowski, Yang Tong, Zengquan Wang, Yoshihiko Yokoyama, Jittisa Ketkaew, Jan Schroers, Takeshi Egami
Summary: This study suggests that the plasticity of metallic glasses is related to the local atomic rearrangements under stress, rather than their atomic structure directly. By conducting experiments on various bulk metallic glasses, researchers found that the extent of local deviation from affine deformation within the elastic regime is strongly correlated with the plastic behavior of metallic glasses beyond yield.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
D. X. Han, G. Wang, Q. Wang, R. Feng, X. D. Ma, K. C. Chan, C. T. Liu
Summary: Shear-banding behavior in metallic glasses, which is associated with yield strength, is influenced by many factors at a micro-scale. In this study, a plastic-strength model was developed considering machine compliance, micro-pillar geometry imperfection, and substrate sink-in. The model was supported by the compressive properties of 18 metallic glasses and provides guidance for elastic limits and shear-banding dynamics at the micro-scale in characterizing deformation behavior of amorphous materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Juhee Oh, Sangeun Park, Hyo Ju Bae, Sujung Son, Hyoung Seop Kim, Jae Bok Seol, Hyokyung Sung, Jung Gi Kim
Summary: Elevated temperature high-pressure torsion processing can alter the microstructure of aluminum alloys and enhance their mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
J. Ding, A. Inoue, S. L. Zhu, S. L. Wu, E. Shalaan, A. A. Al-Ghamdi
Summary: This study investigated the effects of increased aluminum content on the glass-forming ability, microstructure, phase stability, mechanical properties, and deformation behaviors of Zr-rich Zr-Cu-Al alloys in bulk metallic glass composites (BMGCs). It was found that higher aluminum content improved the glass-forming ability of the alloys, leading to the fabrication of BMGCs with enhanced performance. The Zr-rich Zr-Cu-Al BMGCs exhibited a large fracture strain and high fracture strength under compression, with superior plastic deformation capabilities attributed to factors such as the formation of shear bands and interactions between crystals and shear bands.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Wei-Hui Lin, Chong-Min She, Chun-Yu Zhang, Paulo S. Branicio, Zhen - Dong Sha
Summary: The mechanical properties of cellular metallic glasses are influenced by the shape of their cellular structures. Random structures with uniform porosity show higher yield strength and Young's modulus compared to microlattice structures. The chiral structure displays the highest Young's modulus, while stochastic cellular structures exhibit higher energy absorption capacity.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Chemistry, Physical
Shan Zhang, Chao Wei, Zhilin Shi, Haoran Zhang, Mingzhen Ma
Summary: Fe doping significantly improves the glass-forming ability, stability, and mechanical properties of Zr50Cu34-xFexAl8Ag8 metallic glasses. The addition of Fe inhibits the formation of crystalline phases, increases the glass-forming ability, and enhances the fracture strength and ultimate strain of the metallic glass samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Nicolas Amigo, Simon Palominos, Felipe J. Valencia
Summary: This study employed machine learning models to predict the plastic properties in CuZr metallic glasses. Molecular dynamics simulations were conducted for 100 different samples, and statistical analysis was performed on 17 materials properties. Strong correlations were found between stoichiometry, temperature, structural, and elastic properties with plastic properties. Three regression models were used for prediction, and linear and Ridge regressions showed better performance with coefficients of determination above 80% for three plastic properties. Lasso regression had lower performance with coefficients of determination above 60% for two plastic properties. Overall, this work demonstrates that molecular dynamics simulations combined with machine learning models can provide a framework for predicting the plastic behavior of complex materials.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Jie Dong, Hailong Peng, Hui Wang, Yang Tong, Yutian Wang, Wojciech Dmowski, Takeshi Egami, Baoan Sun, Weihua Wang, Haiyang Bai
Summary: The atomic-scale structural rearrangement of glasses under stress is important for understanding their macroscopic mechanical properties. However, it is challenging to experimentally resolve the atomic-scale structural changes of a deformed glass due to its disordered nature. This study shows that structural anisotropy is correlated with non-affine atomic displacements in glasses, providing an approach to identify atomic-scale non-affine deformation. The study also reveals the atomic-level mechanism responsible for plastic flow, which differs between metallic glasses and covalent glasses.
Article
Materials Science, Ceramics
Y. Tan, Y. W. Wang, X. W. Cheng, Q. Fu, Z. H. Xin, Z. Q. Xu, H. W. Cheng
Summary: The study found that appropriate Al substitution can improve the glass-forming ability, strength, and plasticity of amorphous alloys, but fracture strength decreases and no dynamic compression plasticity is observed during dynamic loading.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Rathinavelu Sokkalingam, Zhao Chao, Katakam Sivaprasad, Veerappan Muthupandi, Jayamani Jayaraj, Parthiban Ramasamy, Juergen Eckert, Konda Gokuldoss Prashanth
Summary: CoCrFeMnNi high-entropy alloy/AISI 316L stainless steel bimetal was fabricated using SLM, showing enhanced hardness and tensile strength due to the composition and structure advantages. However, the presence of defects and higher susceptibility to pitting corrosion in CoCrFeMnNi-HEA make it more prone to corrosion attack in corrosive environments.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sabine C. Bodner, Kostyantin Hlushko, Kevin Kutlesa, Juraj Todt, Oliver Renk, Michael Meindlhumer, Florian Resch, Marc-Andre Nielsen, Jozef Keckes, Jurgen Eckert
Summary: The correlations between process conditions, microstructure, and mechanical properties of additively manufactured components are explored in this study. The results show that the applied hatch strategy has a significant impact on the microstructure and mechanical properties of the samples, especially the anisotropy observed in the plane perpendicular to the build direction.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sepide Hadibeik, Florian Spieckermann, Martin Nosko, Farzad Khodabakhshi, Mahmoud Heydarzadeh Sohi, Juergen Eckert
Summary: A novel approach for fabricating bulk metallic glass using additive manufacturing has been studied, however, there are challenges, such as unmelted powder and compositional deviation, that need further investigation to optimize the process parameters.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jelena Petrusa, Benjamin Meier, Gerda Gruenbacher, Wolfgang Waldhauser, Juergen Eckert
Summary: The effects of laser energy density on the relative density and microstructure of cp-TiGd2 fabricated by LB-PBF were studied, and the influence of printing orientation and different surface treatments on surface topography and biocompatibility were investigated. The aim is to develop additive manufacturing process parameters that can achieve full density and satisfactory biocompatibility for cp-TiGd2 as a low-cost alternative to biomedical materials. An optimized process with high density, improved surface roughness, and noncytotoxicity was achieved using a wide range of process parameters.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Zequn Zhang, Simon Fellner, Sergey Ketov, Megan J. Cordill, Huaping Sheng, Christian Mitterer, Kaikai Song, Christoph Gammer, Juergen Eckert
Summary: The phase evolution of alloys and atomic diffusion are closely related. However, the influence of reactive diffusion on phase formation in high-entropy alloys (HEAs) is still not clear. This study investigates the phase evolution of a multicomponent CoCrFeNi/Al diffusion couple and reveals the combined effects of enthalpy and entropy on phase formation in HEAs at elevated temperatures. Surface modification of HEAs can be achieved through film deposition and annealing processes.
Review
Electrochemistry
Baran Sarac, A. Sezai Sarac, Juergen Eckert
Summary: This review provides an introduction to the use of advanced amorphous metal catalysts for hydrogen storage and production via electrochemistry. Pd-based metallic glasses have gained significant attention due to their unique atomic structure and properties for energy applications. The review covers the fabrication techniques, hydrogen sorption, hydrogen evolution, kinetics, and future prospects of Pd-based metallic glasses. Overall, it offers a comprehensive overview for large-scale hydrogen energy storage and production systems.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Monika Antoni, Florian Spieckermann, Niklas Plutta, Christoph Gammer, Marlene Kapp, Parthiban Ramasamy, Christian Polak, Reinhard Pippan, Michael J. J. Zehetbauer, Juergen Eckert
Summary: The effects of severe plastic deformation (SPD) by means of high-pressure torsion (HPT) on Fe73.9Cu1Nb3Si15.5B6.6 and Fe81.2Co4Si0.5B9.5P4Cu0.8 iron-based metallic glasses were compared. HPT processing extended the consolidation and deformation ranges for Fe73.9Cu1Nb3Si15.5B6.6, and achieved consolidation and deformation with minimum cracks for Fe81.2Co4Si0.5B9.5P4Cu0.8 for the first time. Various analyses revealed that Fe81.2Co4Si0.5B9.5P4Cu0.8 exhibited HPT-induced crystallization phenomena, while Fe73.9Cu1Nb3Si15.5B6.6 did not crystallize even at high HPT-deformation degrees.
Editorial Material
Chemistry, Multidisciplinary
Juergen Eckert, Daniel Kiener
Article
Chemistry, Physical
Keziban Huner, Baran Sarac, Eray Yuece, Amir Rezvan, Matej Micusik, Maria Omastova, Juergen Eckert, A. Sezai Sarac
Summary: The incorporation of iron and carboxylic acid-functionalized polyaniline into polymeric polycaprolactone structures enhances the electron-donating ability and conductivity of the compound, making it suitable for electrochemical immunosensors.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Engineering, Mechanical
Bin Chen, Yunli Li, Daniel Sopu, Juergen Eckert, Wenping Wu
Summary: The shock-induced dynamic mechanical behavior and spallation failure of Ni-based single crystal superalloys are studied using non-equilibrium molecular dynamic simulations. Two modes of classical spallation and micro-spallation are observed during the spallation failure. The deformation mechanism is dominated by slip and drag of dislocations at low shock velocities, while complex phase transitions from FCC to BCC or disordered structures occur at higher velocities, leading to a decrease in spallation strength. The presence of voids significantly lowers the spallation strength, and the reduction in strength is proportional to the radius of the voids.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Xiaoming Liu, Zongde Kou, Ruitao Qu, Weidong Song, Yijia Gu, Changshan Zhou, Qingwei Gao, Jiyao Zhang, Chongde Cao, Kaikai Song, Vladislav Zadorozhnyy, Zequn Zhang, Juergen Eckert
Summary: This study utilizes high-temperature extrusion and annealing to optimize the microstructures and mechanical properties of the Co34Cr32Ni27Al3.5Ti3.5 multicomponent alloy. Hot extrusion reduces grain sizes and promotes the precipitation of nanoparticles inside the FCC matrix and grain boundaries. Subsequent annealing regulates the microstructures and enhances the mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ming-Wei Wu, Kai Ni, Yang Lei, Xin-Xing Xiong, Yi-Ting Chuang, Quiao-En Lin, Pei Wang, Parthiban Ramasamy, Juergen Eckert
Summary: Selective laser melting (SLM) was utilized to produce CuZrAl metallic glass (MG) scaffolds with combined lattice structures of body-centered cubic and face-centered cubic (F2BCC), and the effects of lattice structures on mechanical behavior were investigated. The results revealed that curved struts remarkably enhanced compressive ductility by 122% and energy absorption by 106%. The presence of curved struts effectively prevented catastrophic shear fracture and delayed fracture occurrence due to the release of strain concentrations. This study demonstrates the potential of improving the ductility and toughness of SLM MG components through appropriate lattice structure design.
Article
Engineering, Manufacturing
Ruiqi Wang, Lixia Xi, Lili Feng, Baran Sarac, Konda Gokuldoss Prashanth, Juergen Eckert, Dongdong Gu
Summary: Dual-phase reinforcing approach is an efficient strategy for fabricating advanced aluminum matrix composites. However, designing a dual-phase reinforcing system with synergistic strengthening effect for LPBF process is challenging.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Xintian Wang, Zhiyong Ji, Robert O. Ritchie, Ilya Okulov, Juergen Eckert, Chunlei Qiu
Summary: In this study, TiAl and Cr3C2 particles were added to a CrMnFeCoNi alloy to improve its processibility and mechanical properties. The addition of TiAl particles resulted in the formation of cracks, but the further addition of Cr3C2 particles helped suppress hot cracking. The presence of long-range ordered domains and precipitates contributed to the improved strength of the dual-particle containing alloy.
MATERIALS TODAY ADVANCES
(2023)
Article
Chemistry, Physical
Baran Sarac, Remzi Gurbuz, Matej Micusik, Maria Omastova, Amir Rezvan, Eray Yuece, Lixia Xi, Juergen Eckert, Ali Ozcan, A. Sezai Sarac
Summary: This study focuses on the synthesis and properties comparison of a novel organic composite nanofiber material consisting of styrene-butadiene-styrene (SBS) copolymer blended with polystyrene (PStyr) and carbon nanotubes (CNTs). The addition of CNTs retards the crystallization process and decreases the absorbance of both SBS/PStyr and PStyr/PBu in Fourier transform infrared spectroscopy. The interaction of CNTs with the blend is limited in samples with SBS, as observed in Raman spectroscopy.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Chemistry, Physical
M. H. Abbasi, R. Tavakoli, S. G. Shabestari
Summary: The correlation between atomic-scale structure and glass-forming ability of ternary bulk metallic glasses was investigated using molecular dynamics simulation. It was found that the potential energy of the icosahedra reflects the geometric ordering, while the virial stress energy density reveals the chemical ordering. Based on this discovery, a new prediction criterion for glass-forming ability was proposed and validated using experimental data.
Article
Chemistry, Physical
Haimin Zhai, Shuai Cui, Sheng Li, Dongqing He, Bo Cheng, Xinjian Zhang, Wensheng Li, Zhornik Viktor, Uladzimir Seniuts
Summary: Laser shock peening (LSP) treatment significantly affects the phase structure and properties of titanium-based BMG materials, promoting rejuvenation and introducing heterogeneity. This leads to improved plasticity and resistance to crack propagation. LSP-1 specimen exhibits higher hardness and plasticity, reducing fatigue peeling wear caused by brittleness. However, excessive LSP results in increased susceptibility to pitting and significantly reduces tribocorrosion resistance.
Article
Chemistry, Physical
Olga A. Blatova, Maria A. Solodovnikova, Ekaterina M. Egorova, Vladislav A. Blatov
Summary: This study applied a universal geometrical-topological approach to analyze the crystal structures of intermetallic compounds deposited in the Inorganic Crystal Structure Database. By exploring the local atomic configurations, they identified different types of coordination polyhedra and proposed criteria for determining geometric instability. This research provides useful indicators for checking crystallographic information and validating structural models.
Article
Chemistry, Physical
Jose M. Torralba, Diego Iriarte, Damien Tourret, Alberto Meza
Summary: The amount of globally recycled e-waste is less than 20% of the total produced. One of the causes for this low recycling rate is the complex and expensive selective sorting of metals. However, recent research has shown that high entropy alloys (HEAs) can be made from complex alloy mixtures, reducing the dependence on pure critical metals. It has been demonstrated that e-waste can be used to produce competitive HEAs.
Article
Chemistry, Physical
M. Y. He, Y. F. Shen, N. Jia, W. Y. Xue, J. P. Li
Summary: This study successfully improved the mechanical properties of high-entropy alloys (HEAs) through phase decomposition modulation, achieving strengthening of low-cost CuFeMnNi HEAs. The annealed HEAs exhibited excellent mechanical properties, with significantly increased yield strength and maintained satisfactory elongation.
Article
Chemistry, Physical
D. V. Louzguine-Luzgin, F. R. Pratama
Summary: In this study, the growth rate of a crystalline phase in the Al-Fe-Mn-Si metallic glass was measured in real time using transmission electron microscopy. The effective diffusion coefficient related to the slowest diffusing element (Mn) was estimated. The results showed that the growth rate of the crystalline phase was significantly faster compared to pure Al and AlFe compound.
Article
Chemistry, Physical
Zhenhua Han, Yubo Tian, Jun Yang, Jianzhao Li, Jinyang Zhang, Gang Liu, Ran Wei, Guojun Zhang
Summary: In this study, a novel medium-entropy alloy (MEA) (Fe65Ni15Cr10Co10)92Ti5Al3 with a dual heterogeneous structure was developed by adding Ti and Al to a previously reported Fe65Ni15Co10Cr10 MEA. The MEA exhibited ultra-high ultimate tensile strength and work hardening extent at room temperature. The addition of Ti and Al induced precipitation and resulted in a continuous FCC -> BCC martensitic transformation and a transformation-induced plasticity effect. The excellent mechanical properties of the alloy were attributed to the synergistic effects of hetero-deformation induced strengthening, precipitation strengthening, and TRIP.
Article
Chemistry, Physical
S. Y. Liang, L. T. Zhang, B. Wang, Y. J. Wang, E. Pineda, J. C. Qiao
Summary: This study focuses on the influence of the thermomechanical protocol on the aging or rejuvenation of glass by decoupling the thermal and mechanical processes. The results show that Labased metallic glass exhibits material hypomnesia, with a clearer rejuvenation trend observed after imposing increasing amplitude strain oscillations. There is a threshold value of the oscillation amplitude that separates the effects of the protocol into acceleration of aging or rejuvenation. This study reveals the correlation between the thermomechanical properties of metallic glass and the previous application of strain oscillations of various amplitudes, providing an effective tool for regulating the structural state of metallic glasses through a simple-operated method.
Article
Chemistry, Physical
Chihui Liu, Hua Zhang, Qing Wang, Panzhi Wang, Jiadian Yang, Fanchao Meng, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: Thermal deformation behavior and microstructure evolution of GH141 alloy were efficiently studied using high-throughput double-cone gradient compression. Different compression temperatures resulted in a wide gradient equivalent strain distribution and gradient microstructure. The dynamic recrystallization mechanism shifted towards discontinuous dynamic recrystallization with increasing compression temperature.
Article
Chemistry, Physical
D. Dubaux, J. Zollinger, M. -C. de Weerd, J. Ghanbaja, S. Mathieu, S. Migot, P. Boulet, S. Sturm, V. Fournee, M. Sicot, J. Ledieu
Summary: We report the formation of large and highly twinned dendrites of the Al13Fe4 approximant phase embedded in an fcc Al-rich matrix. Using a rapid cooling technique, the approximant appears as a 10-fold dendrite. The grain distributions within the arm are complex and a single dendrite arm can contain up to four different orientations. Three types of twins, namely {100}, {001} and {201} twins, have been identified. A growth mechanism involving heteroepitaxial growth from a decagonal Al-Fe quasicrystalline seed is proposed to explain the formation of these specific 10-fold motifs.
Article
Chemistry, Physical
Ming Yang, Yibo Zhang, Jie Dong, Yan Huang, Zhichao Lu, Liang Wang, Xuerui Wei, Zhengdong Fu, Jinkui Zhao, Wenli Song, Wei Li, Yuntao Liu, Dong Ma
Summary: A multi-element microalloying strategy has been used to improve the microstructure and mechanical properties of CuZr-based bulk metallic glass composites. Microalloying effectively refines the CuZr phase and results in finely dispersed B2 crystallites embedded in the BMG matrix, leading to the formation of centimeter-sized BMGCs with good mechanical properties.
Article
Chemistry, Physical
Xuejie Zhu, Xuexi Zhang, Mingfang Qian, Ziyi Wang, Aibin Li, Zongning Chen, Muhammad Imran, Lin Geng
Summary: The homogeneous superelastic behavior in shape memory alloys (SMAs) is crucial for their functional and structural fatigue properties, as well as their stable elastocaloric effect (eCE). In this study, a Ti-22Nb-4Zr-2Ta plate was prepared with a strong recrystallized texture, resulting in a completely recoverable superelastic strain and narrow hysteresis. The observation of strain and temperature evolution revealed the importance of diffuse transformation and favorable texture in achieving mesoscopically homogeneous transformation and related elastocaloric effect.
Article
Chemistry, Physical
Mohammad Navazani, Sitarama Raju Kada, Daniel Fabijanic, Matthew Barnett
Summary: This study investigates the effect of Cu and Al addition on an alloy containing multiple principal elements. The results show that adding small amounts of Cu can improve the alloy's ductility and the hardness of the FCC phase can be predicted using a hybrid model. Unlike previous studies, the corrosion resistance of the alloy is not affected by Cu addition, indicating its potential for further development into a fine-grained stainless steel alloy.
Article
Chemistry, Physical
Fatemeh Azizian, Homam Naffakh-Moosavy, Fatemeh Bagheri
Summary: Novel biodegradable Zn-xCu-0.8Mn-0.4Ag alloys were prepared in this study, and the effects of Cu addition and hot extrusion process on microstructure, mechanical properties, and cytotoxicity of the alloys were investigated. The results showed that adding copper and performing a hot extrusion process can significantly improve the mechanical properties of the alloys, making them potential candidates for cardiovascular stents.
Article
Chemistry, Physical
Ivan A. Ditenberg, Denis A. Osipov, Ivan Smirnov, Konstantin V. Grinyaev
Summary: This study investigates the effect of high-temperature annealing on the structural-phase state and microhardness of Ni3Al samples obtained by spark plasma sintering after high-energy ball milling. The results show that certain annealing temperatures promote grain growth and high-density nucleation, leading to the formation of a fine-grained structural state. The study also analyzes the influence of annealing temperature on the strengthening mechanisms.
