Article
Chemistry, Physical
Fei Yang, Liming Dong, Lei Cai, Xianjun Hu, Feng Fang
Summary: Experimental results show that the microstructure of the high entropy alloy is a single-phase face-centered cubic solid solution, with carbon and silicon completely dissolved in the matrix. With decreasing temperature, the strength and plasticity of the alloy increase, and more secondary nanoscale twins are observed at low temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Chengcheng Zhang, Kai Feng, Hiroyuki Kokawa, Zhuguo Li
Summary: The relationship between the hierarchical microstructure and mechanical properties of a CoCrFeMnNi high entropy alloy built by laser powder bed fusion (LPBF) was investigated. The study found that both the columnar grain morphology and texture play important roles in the anisotropy of mechanical properties. The volume-weighted average grain size showed high accuracy in estimating the yield strength and critical twinning stress along different directions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Lijing Lin, Xin Xian, Zhihong Zhong, Kuijing Song, Chengyong Wang, Guoqiang Wang, Yucheng Wu, Peter K. Liaw
Summary: The dual-phase FeCoCrMn alloy with alternating lamellar FCC and sigma phases showed high compression yield strength and limited ductility. Improved thermal activation process and strength decline at elevated temperatures were responsible for the increased ductility and decreased yield strength. Comparison of yield strength with other high-entropy alloys was also made.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Chengbin Wei, Yiping Lu, Xinghao Du, Jun Wang, Tongmin Wang
Summary: The high-entropy alloys Co29Cr29Fe29Ni12.5W0.5 prepared by vacuum induction melting and mechanical processing exhibited outstanding mechanical properties with a yield strength of 1.13 GPa and fracture elongation of 24.3% after annealing at 725 degrees C. The addition of W element and ultrafine grain structure were attributed to the excellent mechanical properties observed in the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Chengbin Wei, Yiping Lu, Xinghao Du, Jun Wang, Tongmin Wang
Summary: Nonequiatomic Co29Cr29Fe29Ni12.5W0.5 high-entropy alloys exhibited outstanding mechanical properties after annealing at 725 degrees C, attributed to the addition of the W element and ultrafine grain structure. Dislocation slip, stacking faults, and nano-twins governed the deformation mechanism in the annealed alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Zhen Zhang, Zhihao Jiang, Yuehuang Xie, Sammy Lap Ip Chan, Jiamiao Liang, Jun Wang
Summary: By introducing pre-twins in high entropy alloy, multiple deformation mechanisms can be triggered at room temperature, enhancing the material's strength and ductility, and improving the work hardening ability.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Avala Lavakumar, Shuhei Yoshida, Jesada Punyafu, Shiro Ihara, Yan Chong, Hikaru Saito, Nobuhiro Tsuji, Mitsuhiro Murayama
Summary: The study focuses on the influence of grain size and temperature on the mechanical properties of equiatomic FeCoNi alloy. Different grain sizes ranging from ultra-fine to coarse were achieved by high-pressure torsion and annealing. The results show that the tensile yield strength is affected by temperature and grain size, and the grain boundary strength remains constant while the friction stress increases at lower temperature. At cryogenic temperature, the presence of nano twinning contributes to the enhancement of strength and ductility in addition to dislocation slip.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Avanish Kumar Chandan, Premkumar Murugaiyan, Sandip Ghosh Chowdhury
Summary: This study investigated the deformation behavior and tensile properties of a new high-entropy alloy at room temperature and -100 degrees C. The results showed that the slip configuration transitioned from wavy to planar with decreasing temperature, and deformation twinning only occurred at -100 degrees C. The stacking fault energy of the alloy at -100 degrees C was determined using transmission electron microscopy, while it could not be estimated at room temperature. Activation of planar slip-induced dislocation features at -100 degrees C improved the work hardening and tensile properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Mike Schneider, Guillaume Laplanche
Summary: Investigations on equiatomic CrFeNi medium-entropy alloy reveal stable face-centered cubic solid solution properties at specific temperatures. Cold-working and recrystallization processes can produce different grain sizes, showing varied mechanical properties and deformation mechanisms influenced by temperature. Analysis of deformation processes at different strains indicates a combination of dislocation glide and twinning mechanisms.
Article
Materials Science, Multidisciplinary
Kaisheng Ming, Bo Li, Lichen Bai, Ping Jiang, Xiaolei Wu, Shijian Zheng, Jian Wang
Summary: Under extremely low temperature, the CrMnFeCoNi high-entropy alloy exhibits dynamically reversible shear transformations, leading to the formation of dynamic nano-laminated dual-phase structures. These transformations enhance the strength, strain-hardening ability, and ductility of the alloy, providing a new approach to tackle the strength-ductility dilemma.
Article
Chemistry, Physical
Yuze Wu, Shilei Liu, Kaiguang Luo, Charlie Kong, Hailiang Yu
Summary: The deformation mechanism and mechanical properties of CoCrFeNi high-entropy alloys subjected to room-temperature rolling (RTR), cryorolling (CR), and asymmetric cryorolling (ACR) were investigated. The cryogenic environment in CR and ACR processes facilitated the activation of twins in the HEA, resulting in improved deformation efficiency. ACR HEA exhibited the highest strength among the three processes, with ultimate tensile strength exceeding 1450 MPa and a yield strength increment of nearly 1200 MPa compared to the initial material. ACR also demonstrated the best combination of strength and ductility throughout the rolling deformation process.
JOURNAL OF ALLOYS AND COMPOUNDS
(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
Muhammad Naeem, Haiyan He, Stefanus Harjo, Takuro Kawasaki, Weitong Lin, Ji-Jung Kai, Zhenduo Wu, Si Lan, Xun-Li Wang
Summary: The deformation behavior of CrFeCoNi high-entropy alloy was studied at different temperatures revealing distinct changes in lattice strain, stacking fault probability, and dislocation density at low temperatures. Samples at 40K and 25K exhibited similar high ductility and a significant increase in Peierls stress, while the contribution from planar faults to strain hardening steadily increased from 6% at room temperature to 28% at 25K.
Article
Nanoscience & Nanotechnology
Xianbing Zhang, Weilin Wang, Jialin Wu, Shubin Wang, Jian Sun, Jing Yang Chung, Stephen J. Pennycook
Summary: This study designs a Ti48.9Zr32.0Nb12.6Ta6.5 MEA exhibiting {112}<111>(beta) twins at room temperature. The solution-treated (ST) samples show homogeneous chemical composition, good tensile properties, and no athermal phase. Microscopy reveals the interaction between twins and dislocations in the deformation of MEAs, contributing to work hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
H. Rusakova, L. S. Fomenko, S. N. Smirnov, A. Podolskiy, Y. O. Shapovalov, E. D. Tabachnikova, M. A. Tikhonovsky, A. Levenets, M. J. Zehetbauer, E. Schafler
Summary: The microhardness of high entropy alloy samples changes with temperature, showing an increase as the temperature decreases. Different types of samples exhibit varying microhardness behavior, with coarse-grained and nanocrystalline samples showing different responses to load and temperature variations. The microhardness drop observed in nanocrystalline samples under low load is attributed to mechanical polishing affecting the microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Chaoqiang Liu, Xin Hu, Lin Qi, Houwen Chen, Zhiqiao Li, Xiaoyong Zhang, Hongge Yan, Kechao Zhou, Min Song, Yunzhi Wang, Jian-Feng Nie
Summary: Heterogeneous precipitation of the β phase at boundaries within α' martensite and dislocations greatly affects the mechanical properties of α+β titanium alloys. A novel phenomenon was observed in a Ti-4wt%Mo alloy where the β phase selectively precipitates on Mo-segregated twin boundaries within α' martensite. The unique orientation relationship between the β phase and α' is formed due to the similar structure of the twin boundary and Mo segregation, providing a template for β precipitation and potential improvement in mechanical properties.
Article
Environmental Sciences
Zhihan Cao, Ping Li, Jinchuang Ru, Xuqian Cao, Xu Wang, Bin Liu, Zhi-Hua Li
Summary: This study evaluated the impact of environmental levels of triphenyltin (TPT) on marine Chlorella sp. It found that TPT had both promoting and inhibitory effects on the growth of marine Chlorella sp. depending on the concentration. The chlorophyll composition changed, and oxidative damage and gene expression alterations were observed. These findings contribute to a better understanding of the ecological toxicity of TPT in marine environments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Mechanical
Hao Zhang, Xiaoqin Ou, Song Ni, Hongge Yan, Xiaozhou Liao, Min Song
Summary: The twinning mechanisms in pure Ti, including {11 (2) over bar1} twinning and {11 (2) over bar2}-{11 (2) over bar1} double twinning, are systematically investigated using molecular dynamics simulations. The migration of {11 (2) over bar1} twin boundaries is mainly carried out by the slip of twinning dislocations. Two double twinning mechanisms, involving the formation and growth of {11 (2) over bar1} twin at the {11 (2) over bar2} twin tip, are discovered. The interfacial structures of {11 (2) over bar1} twins exhibit terraced character with short coherent facets and coherent twin boundary segments.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Mechanical
Yang Chen, Shuo Wang, Hui Feng, Weipeng Li, Bin Liu, Jia Li, Yong Liu, Peter K. Liaw, Qihong Fang
Summary: By conducting high-resolution transmission electron microscopy and random field theory informed discrete dislocation dynamics simulations, this study reveals the influence mechanism of heterogeneous lattice strain on the complex interaction between dislocations and dislocation loops in high entropy alloys (HEAs) under irradiation. The results show that lattice-strain-induced irradiation hardening decreases, in line with the excellent irradiation hardening resistance of HEAs observed in recent experiments. A new cross-slip mechanism is also discovered, involving the co-linear reaction between dislocations and rhombus perfect loops. This study provides insights into the mesoscopic-level irradiation damage behavior, guiding the development of advanced HEA materials for nuclear energy applications through the regulation of heterogeneous lattice strain.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Jing Peng, Jia Li, Bin Liu, Jian Wang, Haotian Chen, Hui Feng, Xin Zeng, Heng Duan, Yuankui Cao, Junyang He, Peter K. Liaw, Qihong Fang
Summary: Additive manufacturing is believed to open a new era in precise microfabrication. This study investigates the microstructure evolution of a prototype multi-principal-element alloy FeCrNi fabricated using selective laser melting (SLM) through experiment and simulation. The results reveal the growth of columnar crystals across cladding layers and the development of dense cellular structures in the filled crystal. At the micron scale, the constituent elements are evenly distributed, while at the near-atomic scale, segregation of Cr element is observed. Simulation results demonstrate changes in the solid-liquid interface and the formation of precipitates, microscale voids, and stacking faults due to the thermal gradient, resulting in residual stress in the SLMed structure. A microstructure-based physical model reveals the presence of strong interface strengthening in tensile deformation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Xinxin Lv, Ning Cao, LingJun He, Bin Liu, Haotian Sun, Wenting Qiu, Zhu Xiao, Yanbin Jiang, Shen Gong
Summary: A series of Cu-10Fe-xSi (x = 0, 0.8, 1.6 wt%) alloys were prepared and the effects of Si content and a novel multi-stage thermomechanical treatment on the microstructure, mechanical, electrical, and magnetic properties of the alloys were studied. The results showed that the Cu-10Fe-0.8Si alloy exhibited higher strength, magnetic permeability, and excellent electromagnetic shielding performance compared to the Cu-10Fe alloy. After peak aging treatment, the Cu-10Fe-0.8Si alloy demonstrated a tensile strength of 593.6 MPa, conductivity of 55.66% IACS, elongation of 22.8%, and relative magnetic permeability of 1.57. The addition of an appropriate amount of Si element resulted in the formation of a dual-scale FeSi phase in the alloy, which promoted the precipitation of Fe atoms and refined the alloy grains, thereby improving the strength and magnetic properties synergistically.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
Jiahao Xie, Yu Miao, Bin Liu, Siliang Shao, Xu Zhang, Zhiyao Sun, Xiaoqin Xu, Yuan Yao, Chaoyue Hu, Jinlong Zou
Summary: Alloying with transition metals is a feasible way to enhance the electrochemical activity and stability of molybdenum carbide. The composite NG-CoFe/Mo2C was synthesized by combining CoFe-Prussian blue analogues with graphitic carbon nitride and Mo6+. It exhibited excellent ORR and OER performances and provided a strategy to improve the stability of molybdenum carbide in oxygen electrocatalysis.
Article
Materials Science, Multidisciplinary
Yang Gao, Zihan Yang, Haibo Xiao, Qian Lei, Bin Liu, Yong Liu
Summary: A Cu35Ni25Co25Cr15 high-entropy alloy (HEA) coating was deposited on a pure Cu substrate by plasma transfer arc (PTA) welding to enhance its surface hardness and wear resistance. The coating consisted of Cu-rich A1 phase and NiCoCr-rich γ' phase, with an apparent structural gradient and different microstructures in different zones. The coating exhibited improved interfacial bonding with increased welding current, but the hardness showed a non-monotonic trend. At a welding current of 150 A, the coating showed good metallurgical bonding with the Cu substrate and excellent wear resistance, especially at high temperatures.
Article
Nanoscience & Nanotechnology
Zhenmeng Luo, Peibo Du, Zhiguang Guo, Min Song, Bo Li, Zaisheng Cai, Fengyan Ge
Summary: In this study, a novel antisedimentation mechanism was proposed based on the coagulation mechanism of colloids. A stable reciprocal-supporting antisedimentation conductive copper nanowire ink was prepared and a uniform conductive coating was successfully manufactured. This antisedimentation mechanism relied on the tannic acid-polyethylene imine composite cluster to provide spatial potential resistance and modify the surface charge of copper nanowires, resulting in stable dispersion in the network.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Zizheng Song, Ranming Niu, Xiangyuan Cui, Elena V. Bobruk, Maxim Yu. Murashkin, Nariman A. Enikeev, Ji Gu, Min Song, Vijay Bhatia, Simon P. Ringer, Ruslan Z. Valiev, Xiaozhou Liao
Summary: Superplastic deformation of polycrystalline materials is usually achieved by diffusion-assisted grain boundary sliding at high temperatures. Recent research has shown that room-temperature superplasticity can be achieved in ultrafine-grained Al-Zn based alloys, but the underlying mechanism is still unclear. This study utilized in-situ tensile straining, electron microscopy characterization, and atomistic density functional theory simulation to reveal that the superplasticity at room temperature is achieved by grain boundary sliding and grain rotation, facilitated by the continuous diffusion of Zn. The diffusion of Zn atoms from grains to grain boundaries forms a Zn nanolayer, acting as a solid lubricant to lower the energy barrier of grain boundary sliding.
Article
Materials Science, Ceramics
Siwei Luo, Weilin Yu, Min Song, Jianhong Yi, Baisong Guo, Zhentao Yu, Wei Li
Summary: In this study, a uniform and continuous Cr(OH)3 coating was decorated on the surface of carbon nanotubes (CNTs), which was subsequently decomposed into a Cr2O3 transition layer during the fabrication processes for the Cu matrix composite. Precoating Cr(OH)3 on CNTs can promote their dispersion in the Cu matrix and reduce the density difference between CNTs and Cu powders. The formed composite interface structure, with in-situ nanosized Cr carbides (Cr2C3 and Cr23C6), enhances the interfacial bonding and significantly improves the compression yield strength of the bulk composite.
CERAMICS INTERNATIONAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Daifei Wu, Meng Chen, Weichen Mao, Xiaoqin Ou, Min Song
Summary: In this study, transmission electron microscopy and electron channeling contrast imaging combined with electron backscatter diffraction were used to analyze the microstructural evolution and dominant deformation mechanisms of a Fe-13.6Mn-1.2Al-0.6C (wt%) steel during tensile deformation. Due to the multiple-stage strain hardening effect, this alloy exhibits excellent combination of strength and plasticity, with a yield strength, ultimate tensile strength, and elongation of 540 (+/- 30) MPa, 1120 (+/- 70) MPa, and 74 (+/- 3)%, respectively. The early hardening stage is determined by dislocation accumulation and planar slip, while twinning and microbanding dominate the plastic deformation of the steel, resulting in the synergetic effect of twinning-induced plasticity and microband-induced plasticity.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Environmental Sciences
Xuemin Xing, Jihang Zhang, Jun Zhu, Rui Zhang, Bin Liu
Summary: Health monitoring is crucial for densely distributed urban infrastructures in rapidly progressing cities. A novel time-series InSAR process, based on the AWHPSPO algorithm and TELM, is proposed to address the limitations of PSI. The algorithm provides a reference for the control of the health and safety of urban infrastructures.
Article
Nanoscience & Nanotechnology
Weijin Cai, Junyang He, Li Wang, Wenchao Yang, Xiangqi Xu, Khurram Yaqoob, Zhangwei Wang, Min Song
Summary: This study investigates the chemical short-range order (CSRO) in VCoNi medium-entropy alloy (MEA) processed by spark plasma sintering (SPS) and hot-rolling (HR). The SPS-HRed MEA exhibits a sharp increase in strength compared to the cast counterpart, attributed to the presence of dislocations, stacking faults, nano-twins, and V-oxide particles. Despite differences in microstructure and thermal routes, the CSRO in the SPS-HRed MEA shows a similar L11-type structure motif and sub-nanometer size. The preference of V-Co and avoidance of V-V pairs are observed, while the preference of V-Ni pair disappears due to the varying matrix composition.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Coatings & Films
Lei Yu, Wenting Jiang, Xinglong An, Song Ni, Guowei Bo, Wei Li, Min Song
Summary: This study explores the combination of aluminizing and laser shock peening (LSP) techniques on AISI 321 stainless steel to enhance its mechanical properties. The aluminized steel forms a three-layer protective coating with decreasing aluminum concentration. LSP treatment introduces a dislocation density gradient, dislocation-precipitate interactions, and compressive stress. The aluminizing + LSP processed steel exhibits significant improvement in high temperature tensile properties compared to the as received 321 steel.
SURFACE & COATINGS TECHNOLOGY
(2023)
