Article
Chemistry, Physical
Tianxu Zhao, Songshan Jiang, Qingxin Cui, Xianxue Zhang, Zhiliang Ning, Hongbo Fan, Jianfei Sun, Yongjiang Huang
Summary: In this study, the deformation behaviors of a Cu47.5Zr48Al4Nb0.5 bulk metallic glass composite (BMGC) in the temperature ranging from 663 K to 763 K have been investigated. The studied BMGC exhibits superplasticity within the supercooled liquid region (SLR) and the deformation involves both homogeneous and inhomogeneous modes. The temperature dependence of deformation behaviors in BMGCs was better understood through this study.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Tianding Xu, Xiao-Dong Wang, Eric M. Dufresne, Yang Ren, Qingping Cao, Dongxian Zhang, Jian-Zhong Jiang
Summary: Anomalous fast atomic dynamics were discovered in a metallic glass with good glass forming ability, mainly attributed to the increased mobility of Cu atoms by Ag addition, leading to the formation of structural heterogeneity at the atomic level.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
Stefan Michalik, Zuzana Molcanova, Michaela Sulikova, Katarina Kusnirova, Pal Jovari, Jacques Darpentigny, Karel Saksl
Summary: The Mg-Zn-Ca system was investigated for its glass-forming ability by fabricating ribbon specimens using melt-spinning technique with a concentration line of 7 at.% calcium. The samples were characterized to determine their mass density, hardness, elastic modulus, and crystallisation temperatures. Pair distribution functions obtained by HEXRD and ND measurements described the amorphous structure, revealing contributions of Mg-Mg, Mg-Zn, and Zn-Zn pairs. In situ HEXRD showed the transformation process from amorphous to crystalline structure for Mg60Zn33Ca7 and Mg50Zn43Ca7, proposing the formation of intermetallic compounds IM1 and IM3 as well as hcp-Mg phase in multiple crystallisation events.
Article
Chemistry, Physical
Songshan Jiang, Yongjiang Huang, Peng Xue, Fangmin Guo, Yang Ren, Jianfei Sun, Alfonso H. W. Ngan
Summary: The effect of cryogenic testing temperatures on the deformation behavior of a CuZr-based bulk metallic glass composite (BMGC) was investigated in this study, showing that the yield strength and work-hardenability increased from 298 K to 153 K. The higher yield strength at lower temperatures can be attributed to a larger difference in volume shrinkage between the crystalline phase and the amorphous matrix, while the increasing martensitic transformation degree of the crystalline phase at lower temperatures resulted in enhanced work-hardenability. These results contribute to a better understanding of the temperature dependence of phase-transformation induced plasticity in CuZr-based BMGCs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Y. H. Meng, S. Y. Zhang, W. H. Zhou, J. H. Yao, S. N. Liu, S. Lan, Y. Li
Summary: Structural relaxation and subsequent rejuvenation through thermal treatment can improve the plasticity and fracture toughness of metallic glasses. The recovery of loosely packed regions in the atomic structure during annealing contributes to the observed rejuvenation. Tailoring the mechanical properties of metallic glasses can be achieved by controlling the annealing and thermal treatment conditions.
Article
Chemistry, Physical
Weijian Zhang, Pingjun Tao, Yugan Chen, Junfeng Si, Ziyun Long, Shengkai Huang, Huajie He, Zhenghua Huang, Yuanzheng Yang
Summary: The microstructure, thermomechanical properties, and high temperature plastic deformation behavior of Zr55.7Cu22.4Al14.7Ni7.2 alloy rods were investigated. The alloy showed non-Newtonian fluid properties under low temperature-high strain rate conditions, while it exhibited the deformation behavior of a Newtonian fluid under high temperature-medium to high strain rate conditions. The alloy crystallized after deformation at high temperature and low strain rate, while maintaining an amorphous structure in the low and medium temperature region. High temperature deformation also affected the Vickers microhardness of the metallic glass.
Article
Chemistry, Physical
Chao Xu, Katharina Marker, Juhan Lee, Amoghavarsha Mahadevegowda, Philip J. Reeves, Sarah J. Day, Matthias F. Groh, Steffen P. Emge, Caterina Ducati, B. Layla Mehdi, Chiu C. Tang, Clare P. Grey
Summary: A structure-driven degradation mechanism is proposed for Ni-rich layered cathode material NMC811, in which a proportion of the material exhibits a lowered accessible state of charge and becomes fatigued after repetitive cycling. This degradation is attributed to high interfacial lattice strain between the reconstructed surface and the bulk layered structure above a distinct threshold.
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
Sergey Sumnikov, Ivan A. Bobrikov, Igor S. Golovin, Anatoly M. Balagurov
Summary: The crystal structure of bulk quenched Fe-27Ga alloy was studied using high-resolution neutron and X-ray diffraction to determine phase distribution. The presence of additional phases B2 and A2, in addition to the ordered D0(3) phase, was observed in the surface layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
Huaping Sheng, Daniel Sopu, Simon Fellner, Jurgen Eckert, Christoph Gammer
Summary: By using high-resolution microscopy techniques, we quantitatively mapped the atomic density and strain distribution of individual shear bands, revealing the complex characteristics of shear bands. Shear bands exhibit density alternation and complex strain fields, which can cause segmentation and deflection of the shear bands.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Peng Xue, Yongjiang Huang, Simon Pauly, Fangmin Guo, Yang Ren, Songshan Jiang, Feiya Guo, Shu Guo, Hongbo Fan, Zhiliang Ning, Jianfei Sun
Summary: In this study, in-situ high-energy X-ray diffraction and molecular dynamic simulation were used to investigate the structural evolution of CuZr-based bulk metallic glass composites during cryogenic treatment. The pre-strained sample underwent martensitic transformation and reverse martensitic transformation, which were influenced by environmental factors and stress. The results provide insights into the mechanism of martensitic transformation in the B2 CuZr phase and offer guidance for fine-tuning the structure and mechanical behaviors of these composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Keita Nomoto, Anna Ceguerra, Christoph Gammer, Bosong Li, Huma Bilal, Anton Hohenwarter, Bernd Gludovatz, Jurgen Eckert, Simon P. Ringer, Jamie J. Kruzic
Summary: The study revealed the hierarchical structure of BMGs through nanobeam electron diffraction experiments, showing that the local hardness of microscale domains decreases with the size and volume fraction of atomic clusters with higher local MRO. A model of ductile phase softening was proposed to enable the design of BMGs in the future by tuning the MRO size and distribution in the nanostructure.
Article
Materials Science, Ceramics
Xi Zhao, Si Lan, Lina Hu, Zhenduo Wu, Yaqiang Dong, Yang Ren, Xun-Li Wang
Summary: This study reveals the magnet-influenced beta relaxation in Fe-based metallic glasses and its interaction with magnetic ordering, and finds a two-stage relaxation behavior with the pinning effect of Curie temperature in the first stage and its disappearance in the second stage.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
J. Ding, L. Li, N. Wang, L. Tian, M. Asta, R. O. Ritchie, T. Egami
Summary: This study investigates the local structural evolutions in the beta relaxation process of metallic glasses through atomistic simulations, revealing universal melt-like features in the saddle states of the PEL. The short-lived local melting at the saddle point is found to wipe out prior thermal history, providing an explanation for the decoupling of activation and relaxation stages in the b process. These findings emphasize the importance of understanding the nature of saddle states in elucidating system dynamics and raise questions about the current view on system evolution in the PEL.
MATERIALS TODAY PHYSICS
(2021)
Article
Polymer Science
Tyler Eastmond, Jing Hu, Vahidreza Alizadeh, Rostislav Hrubiak, Jay Oswald, Alireza Amirkhizi, Pedro Peralta
Summary: Polyurea, an elastomer with a phase-segregated microstructure, was studied under high pressure using multi-angle energy-dispersive X-ray diffraction experiments. The results indicate compression between hard segments and an increase in π-stacking separation between soft segments under pressure.
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
C. Y. Yue, Q. Wang, X. N. Zheng, A. L. Li, D. Ding, B. Z. Tang, P. Yu, J. L. Yao, L. Xia
Summary: This paper reports an amorphous ribbon Fe88Ce5Pr2B5 with outstanding magnetocaloric effect near ambient temperature. The Fe88Ce5Pr2B5 alloy was quenched into an amorphous ribbon shape successfully. The magnetic properties and magnetocaloric behavior of the Fe88Ce5Pr2B5 glassy ribbon were studied. It was found that the amorphous ribbon exhibited typical magnetocaloric behavior of second-order magnetic transition with a large maximum magnetic entropy change (- Delta Smpeak, -3.97 J/(kg x K) under 5 T) and adiabatic temperature rise (Delta Tad, -2.71 K under 5 T) near its Curie temperature (-309 K). The mechanism reported in literature for the almost highest -Delta Smpeak near 310 K of Fe88Ce5Pr2B5 metallic glass shows a promising perspective for achieving higher - Delta Smpeak in Fe-RE-B amorphous alloys.
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.
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
Chemistry, Physical
Hongguo Chen, Yuci Xin, Yong Wu, Junying Jiang, Ding Ding, Lei Xia, Xiaolong Guo, Peng Yu
Summary: The self-supporting Fe25Co25Ni25Mo9P8B8 amorphous ribbon is treated via dealloying or annealing method, and the dealloyed ribbon exhibits low over-potential, small Tafel slope, and excellent stability, which are superior to the raw ribbon and the annealed ribbon. The fast self-reconstruction of active layer in amorphous structure and the protection effect of Mo/P oxide layer induced by dealloying significantly boost the OER activity and stability of the amorphous ribbon.
JOURNAL OF ALLOYS AND COMPOUNDS
(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
Chemistry, Physical
Shu-Hui Zheng, Qiang Wang, Li-Ze Zhu, Peng-Jie Wang, Ding Ding, Ben-Zhen Tang, Peng Yu, Jin-Lei Yao, Lei Xia
Summary: The composition dependence, magnetic and magnetocaloric properties of Fe87Ce13-xBx (x = 5, 6, 7) metallic glass ribbons were investigated. It was found that the glass forming ability and Curie temperature (Tc) improved with increasing boron content. A table-shape magnetic entropy change profile with a high average -Delta S-m was achieved in an amorphous composite, making it a potential candidate for efficient refrigeration in a domestic magnetic refrigeration appliance.
Article
Chemistry, Physical
Cheng Bai, Yong Wu, Yuci Xin, Junfeng Mou, Lei Xia, Ding Ding, Xingqun Zheng, Peng Yu
Summary: By introducing alkali metal ions (Li/Na/K) into CuxS (x = 1 or 2), the oxygen evolution reaction (OER) performance of copper sulfides can be greatly enhanced. The doping of alkali metal ions increases electrical conductivity and optimizes the adsorption energy of oxygenated intermediates, resulting in improved OER performance. NaCu5S3 exhibits the most optimal overpotential of 271 mV @ 20 mA cm(-2), significantly higher than Cu2S, CuS, and most other copper sulfides. Therefore, the doping strategy of alkali metal ions shows important and promising effects on the design of efficient copper sulfide electrocatalysts.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
P. J. Wang, Q. Wang, S. H. Zheng, L. Z. Zhu, D. Ding, B. Z. Tang, P. Yu, J. L. Yao, L. Xia
Summary: A small amount of Zr in the Fe88Zr8B4 metallic glass was replaced by Nd to fabricate fully amorphous Fe88Zr8-xNdxB4 (x = 2, 4) ribbons. The effects of Nd substitution on the glass formability, Curie temperature, and magnetic entropy change were investigated. It was found that minor Nd substitution not only improved the glass formability but also enhanced the magnetic entropy change peak.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Luyi Li, Benzhen Tang, Weijie Fu, Ying Lu, Yunqing Fu, Ding Ding, Lei Xia, Peng Yu
Summary: The study focuses on the effect of Fe addition on the Curie temperature and magnetic entropy change of Gd-based amorphous alloys. It is found that adding 5% Fe can increase the Curie temperature to 281 K, mainly due to the enhanced 3d-3d interaction of transition elements caused by Fe addition. The maximum value of magnetic entropy change is 3.24 J/(kg • K) under a field of 5 T. The results are expected to provide guidance for improving the room temperature magnetic entropy change of Gd-based amorphous alloys.
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)