Article
Materials Science, Multidisciplinary
Zhu-Jin Li, Jin-Guo Wang, Rui-Fang Yan, Ze-Yu Chen, Tian-Yi Ni, Zhong-Qiang Dong, Tian-Shi Lu
Summary: The addition of Ce has significant effects on the hot deformation behavior and microstructure evolution of AZ80 magnesium alloys. The presence of Ce increases the peak stress and weakens the texture of the AZ80-Ce alloy, while promoting recrystallization and reducing dislocation density.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Chemical
Yexin Jiang, Xu Wang, Zhou Li, Zhu Xiao, Xiaofei Sheng, Hongyun Jiang, Gengsheng Cai, Xianwei Zhang
Summary: The hot deformation behavior of Cu-20.0Ni-5.0Sn-0.25Zn-0.22Mn was studied, revealing that flow stress increased with increasing strain rate and decreasing temperature. The constitutive equation of the alloy was established based on the peak flow stress. Nucleation site of dynamic recrystallization generally appeared along grain boundaries.
Article
Materials Science, Multidisciplinary
Tao Song, Siyang Xu, Yinglong Li, Hua Ding
Summary: The hot deformation behavior of Cu-9Ni-6Sn-0.04Cr alloy was investigated through isothermal compression tests. The activation energy of Cu-9Ni-6Sn-0.04Cr alloy was determined to be 218 kJ/mol using the Arrhenius equation. The established constitutive equation accurately predicted the flow stresses of the alloy. The study also identified the main softening mechanism as dynamic recrystallization, with continuous dynamic recrystallization being dominant in high Z value condition and both continuous and discontinuous dynamic recrystallization in middle and low Z value conditions.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Qingjuan Wang, Xinlong Ren, Lei Wang, Tianrong Yan, Kuaishe Wang, Bofan Xu
Summary: The Cu-Ti-Fe alloy exhibits a preference for dynamic recrystallization (DRX) at high temperatures and low-strain rates. The microstructure evolution characteristics of the alloy under high-temperature conditions are described, elucidating the DRX mechanism.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shunlong Tang, Meng Zhou, Xu Li, Yi Zhang, Deye Xu, Zhiyang Zhang, Baohong Tian, Yanlin Jia, Yong Liu, Alex A. Volinsky, Ekaterina S. Marchenko
Summary: In this study, the optimal hot processing conditions of the Cu-1Ni-0.9Sn-0.5Ti-0.3Cr alloy were determined, and the microstructure and texture changes were analyzed, providing references for the production and application of the alloy.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Chang-Hee Cho, Dal-Oh Kim, Kwangtae Son, Hyun-Soon Park
Summary: Al-Zn-Mg-Cu alloys exhibit the best mechanical properties among aluminum alloys, but suffer from poor formability during metalworking processes. This study investigates the high-temperature deformation behavior and mechanisms of an Al-Zn-Mg-Cu alloy, highlighting flow instabilities at higher strain rates and cooler temperatures, reduced recrystallization, diminished power dissipation efficiencies, and notable alpha-fiber generation.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Zhilei Zhao, Zhou Li, Zhu Xiao, Muzhi Ma, Kerui Song
Summary: The hot compression deformation behavior of the Cu-0.45Cr-1.0Ni-0.28Si-0.14Co alloy was significantly affected by deformation temperature and strain rate, resulting in different microstructures and textures. The optimized hot deformation parameters for the alloy were found to be 800-850 degrees C at strain rates of 0.01-0.1 s(-1).
Article
Materials Science, Multidisciplinary
Guojing Yang, Wenchen Xu, Xueze Jin, Zhiyuan Wang, Debin Shan, Bin Guo
Summary: This study investigates the influence of hot deformation parameters on the microstructure evolution and deformation behavior of the extruded 2195 Al-Li alloy. The optimized hot deformation conditions lead to continuous dynamic recrystallization and microstructure refinement. The presence of large second phases and liquid-like grain boundaries in the extruded plate results in a lower deformation activation energy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Review
Materials Science, Multidisciplinary
Deye Xu, Meng Zhou, Yi Zhang, Shunlong Tang, Zhiyang Zhang, Yong Liu, Baohong Tian, Xu Li, Yanlin Jia, Alex A. Volinsky, De Li, Qiujie Liu
Summary: The effects of Y addition on microstructure evolution in Cu-Sn-Ni-Zn-Ti alloys during hot deformation were investigated. Hot deformation experiments were conducted using a Gleeble-1500 simulator, deforming Cu-Sn-Ni-Zn-Ti and Cu-Sn-Ni-Zn-Ti-Y alloys at temperatures ranging from 550 to 950 degrees C and strain rates of 0.001-10 s-1. Constitutive equations were constructed and the hot deformation activation energy of the two alloys was calculated. It was found that the addition of 0.1 wt% rare earth Y element can promote dynamic recrystallization based on analysis of true stress-strain curves and electron backscattered diffraction images. Pole figures showed a texture change from {011}(112) Brass texture and {001}(100) Cube texture to {111}(211) R texture after Y addition. The microstructure and precipitates of the Cu-Sn-Ni-Zn-Ti alloy were analyzed, revealing the presence of Cu4Ti precipitates. Continuous dynamic recrystallization and discontinuous dynamic recrystallization were identified as the main recrystallization mechanisms in the Cu-Sn-Ni-Zn-Ti alloy.
MATERIALS CHARACTERIZATION
(2023)
Article
Metallurgy & Metallurgical Engineering
Zhao-qi Chen, Li-juan Xu, Shou-zhen Cao, Jian-kai Yang, Yun-fei Zheng, Shu-long Xiao, Jing Tian, Yu-yong Chen
Summary: The hot deformation characteristics of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-0.1B-0.1C alloy were investigated by hot compression tests. The flow stress decreases with the increase of temperature and the decrease of strain rate. The microstructure is sensitive to deformation parameters, and dynamic recrystallization prefers to happen at high temperature and low strain rate.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Multidisciplinary
Xiao-Rong Liu, Feng He, Jun-Jie Li, Ying-Ying Dang, Zhi-Jun Wang, Jin-Cheng Wang
Summary: Hot deformation effectively tailors the hypoeutectic microstructure of CoCrFeNiNb0.25 high-entropy alloy, resulting in refined grains and uniformly distributed Laves phases, which improves its mechanical properties.
Article
Materials Science, Multidisciplinary
Shuai Yuan, Jinhui Wang, Peipeng Jin, Lei Zhang
Summary: The study found that as the temperature increased or the strain rate decreased, the peak stress during hot tensile deformation of the alloy decreased and elongation increased. Hot tensile increased texture intensity and the microstructure exhibited characteristic features of basal fiber texture.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Physical
Shulin Dong, Yingdong Qu, Ruirun Chen, Guanglong Li, Wei Zhang, Qi Wang, Hongze Fang, Jingjie Guo, Bo Yu
Summary: By designing and preparing Ti-44Al-4Nb-0.5Fe-0.1B and Ti-44Al-2Nb-2Fe-0.1B alloys, the study focuses on whether and why the hot deformation processing capability of the new alloys is improved. The results show that the Ti-44Al-2Nb-2Fe-0.1B alloy has lower true stress, moderate diffusion activation energy, lower stress exponent, larger hot processing window, lower dislocation density, and more adequate dynamic recrystallization, demonstrating its good hot deformation processing capability and service properties.
Article
Nanoscience & Nanotechnology
Hongwang Fu, Jiaxin Li, Xinbing Yun
Summary: Research on the hot deformation behavior of an as-cast Cu-Ni-Si alloy with columnar grains showed that the main hardening mechanisms were attributed to dynamic recrystallization and dynamic precipitation as flow stress continuously increased. Modified material parameters with strains using fourth power polynomial functions showed good fitness, and the derived constitutive equation predicted accurate values. Microstructure observations revealed that dynamic precipitates had fine sizes and multiple orientation relationships with the Cu matrix, influenced by plastic deformation and temperature changes. The processing maps developed were also affected by selected strains, with those at low strains containing larger instability regions compared to those at high strains, in agreement with microstructure observations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Deqing Ma, Shuai Yuan, Shiyu Luan, Peipeng Jin, Hengrui Hu, Jinhui Wang, Xiaoqiang Li
Summary: The hot deformation behavior of as-cast Mg-2Zn-0.5Mn-0.2Ca alloys was investigated by hot compression tests. The flow stress was found to increase with higher strain rates and lower temperatures. A constitutive equation was obtained, and the average activation energy was calculated. A processing map was developed, and the optimal processing parameters were determined. The microstructural analysis revealed significant differences between instability areas and stable areas, although both had a similar texture. The slip system in deformed grains was determined, and the main dynamic recrystallization mechanism was identified as discontinuous dynamic recrystallization (DDRX). The proportion of DRX increased with lower strain rates and higher deformation temperatures, weakening the texture strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Shengli Liang, Yunzhang Li, Yi Zhang, Meng Zhou, Shuang Liu, Xu Li, Yongfeng Geng, Baohong Tian, Yanlin Jia, Yong Liu, Alex A. Volinsky
Summary: The interface structure of Cu30Cr0.2Zr electrical contacts was modified using CeO2/GO to improve mechanical properties and arc erosion resistance. The addition of CeO2/GO enhanced the tensile strength, ductility, and electrical conductivity of the composites. It also reduced the concentrated erosion of the arc, improved welding resistance, and prolonged the electrode's service life.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Polymer Science
Alexander P. Kondratov, Anastasiya V. Lozitskaya, Vyacheslav N. Samokhin, Alex A. Volinsky
Summary: This study investigates the possibility of producing strain gauges with high sensitivity to mechanical stress using hard elastic films of isotactic polypropylene. The films exhibit thixotropic polymer softening during cyclic deformation (Patrikeev-Mullins effect) and the dry crazing effect. Three methods for preparing rigid elastic films using isotactic polypropylene are proposed, involving the deposition of an adhesive layer and an electrically conductive layer. The optimal manufacturing process for electrical sensors with high sensitivity is determined, including pre-cyclic deformation to form open micropores. A mathematical model is developed to predict the mechanical stress and/or the change in mechanical stress of the strain gauges based on the electrical resistance change in the conductive layer, with up to 700 relative strain sensitivity in the range of 6-35% strain.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Engineering, Manufacturing
Ekaterina S. Marchenko, Yuri F. Yasenchuk, Oibek Mamazakirov, Anatoly A. Klopotov, Gulsharat A. Baigonakova, Alex A. Volinsky, Sergey V. Gunter
Summary: Porous NiTi alloys with improved mechanical properties were obtained by self-propagating high-temperature synthesis (SHS) method in a closed reactor, using layer-by-layer combustion under a protective argon atmosphere. The maximum compressive strain of the porous NiTi alloys synthesized in the closed reactor was 34%, compared to 7% in the open gas flow reactor. The reaction products in the two-phase gas zone of peritectic crystallization were isolated Ti2Ni crystalline clusters in the TiNi matrix, as confirmed by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, energy dispersive spectroscopy, and optical microscopy.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Review
Materials Science, Multidisciplinary
Deye Xu, Meng Zhou, Yi Zhang, Shunlong Tang, Zhiyang Zhang, Yong Liu, Baohong Tian, Xu Li, Yanlin Jia, Alex A. Volinsky, De Li, Qiujie Liu
Summary: The effects of Y addition on microstructure evolution in Cu-Sn-Ni-Zn-Ti alloys during hot deformation were investigated. Hot deformation experiments were conducted using a Gleeble-1500 simulator, deforming Cu-Sn-Ni-Zn-Ti and Cu-Sn-Ni-Zn-Ti-Y alloys at temperatures ranging from 550 to 950 degrees C and strain rates of 0.001-10 s-1. Constitutive equations were constructed and the hot deformation activation energy of the two alloys was calculated. It was found that the addition of 0.1 wt% rare earth Y element can promote dynamic recrystallization based on analysis of true stress-strain curves and electron backscattered diffraction images. Pole figures showed a texture change from {011}(112) Brass texture and {001}(100) Cube texture to {111}(211) R texture after Y addition. The microstructure and precipitates of the Cu-Sn-Ni-Zn-Ti alloy were analyzed, revealing the presence of Cu4Ti precipitates. Continuous dynamic recrystallization and discontinuous dynamic recrystallization were identified as the main recrystallization mechanisms in the Cu-Sn-Ni-Zn-Ti alloy.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Meng Zhou, Yongfeng Geng, Yi Zhang, Yijie Ban, Xu Li, Yanlin Jia, Shengli Liang, Baohong Tian, Yong Liu, Alex A. Volinsky
Summary: A Cu-Co-Si-Ti-Ce alloy with medium electrical conductivity and excellent mechanical properties was obtained through vacuum melting process. The combination of multiple strengthening techniques resulted in high micro-hardness and strength. Co2Si and Co16Ti6Si7 phases exhibited coherent and semi-coherent interface relationships with the copper matrix, relieving interfacial stress and reducing interface energy. Solid solution strengthening, work-hardening, grain boundary strengthening, and precipitation strengthening contributed significantly to the alloy's strengthening.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Hai-Rui Xing, Ping Hu, Chao-Jun He, Xiang-Yang Zhang, Fan Yang, Jia-Yu Han, Song-Wei Ge, Xing-Jiang Hua, Wen Zhang, Kuai-She Wang, Alex A. Volinsky
Summary: This paper investigates the formation mechanism and enrichment distribution of interstitial oxygen in body-centered cubic (BCC) molybdenum. It is found that oxygen exists in the form of solid solution and generates different valence states in Mo metal with increasing concentration. The presence of MoO2, MoO3, and Mo4O11 intermediate oxides is confirmed, and the formation process of oxides is revealed. The enrichment and distribution of oxygen are analyzed, and it is shown that the oxygen content significantly affects the compressive yield strength and hardness of Mo. This study provides important insights into the behavior of interstitial oxygen in refractory Mo metals and guides the development of high-purity rare Mo metals.
Article
Materials Science, Multidisciplinary
Zelin Li, Yuanjun Sun, Songwei Ge, Fei Zhu, Fei Yin, Lina Gu, Fan Yang, Ping Hu, Guoju Chen, Kuaishe Wang, Alex A. A. Volinsky
Summary: Magnetic nanomaterials are extensively used in various fields due to their unique properties such as high specific surface area, strong magnetic properties, chemical stability, and good biocompatibility. The chemical coprecipitation method, known for its simplicity, low cost, and controllable operational conditions, is widely adopted for the synthesis of magnetic nanomaterials. This review article summarizes the preparation principles, factors affecting morphology, size, and microstructure, as well as the mechanisms and process control factors of magnetic nanomaterials prepared by the chemical coprecipitation method. Lastly, the future prospects of magnetic nanomaterials prepared by chemical coprecipitation are discussed.
Article
Materials Science, Multidisciplinary
Ekaterina S. Marchenko, Alexander A. Kozulin, Yuri F. Yasenchuk, Anna V. Vetrova, Alex A. Volinsky, Yi Zhang
Summary: Porous NiTi samples were produced by self-propagating high-temperature synthesis and then cut to specific dimensions. The compression test on the porous SHS-NiTi alloy revealed elastic-plastic deformation and three types of fracture surfaces. An algorithm was developed to create a suitable porous framework model for finite element method calculations. It was found that the studied porous volume exhibited orthotropic elastic properties due to its geometric structure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yunzhang Li, Meng Zhou, Yi Zhang, Hanjing Zhu, Xianhua Zheng, Shengli Liang, Shunlong Tang, Baohong Tian, Yong Liu, Xu Li, Alex A. Volinsky, Chenglin Zheng
Summary: Al2O3-Cu/25Mo5Ta and 0.5Y(2)O(3)/Al2O3-Cu/25Mo5Ta composites were prepared by ball milling and powder metallurgy methods for electrical contact experiments. The addition of Y2O3 had a significant effect on the electrical contact performance, reducing mass loss and improving service life. TEM results showed the generation of nanoscale YTaO4 with excellent thermal stability, positively influencing the electrical contact performance.
Article
Materials Science, Multidisciplinary
Zhiyang Zhang, Meng Zhou, Yi Zhang, Shunlong Tang, Deye Xu, Baohong Tian, Xu Li, Yanlin Jia, Yong Liu, Alex A. Volinsky
Summary: Cu-Ti-Ni-Mg and Cu-Ti-Ni-Mg-Ce alloys were prepared by vacuum induction melting and subjected to hot deformation tests. The true stress-strain curves were obtained and constitutive equations were established. The addition of Ce reduced dislocation density and texture strength, promoted precipitation, and improved the deformation resistance of the alloys. The optimal processing parameters were determined based on the processing maps. The microstructure of the alloys was analyzed using EBSD and TEM, and CuNi2Ti precipitates were found in both alloys, with more in the Cu-Ti-Ni-Mg-Ce alloys.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Ceramics
Shaoyu Wu, Xiaoqian Xu, Shani Yang, Jingwen Qiu, Alex A. Volinsky, Xiaolu Pang
Summary: In this paper, high-entropy nitride coatings with optimal hardness and elastic modulus combination were successfully obtained using a new material system combined with multi-objective optimization. The effects of elemental content on mechanical properties prediction in this system were visualized using partial dependence heatmaps, which helped to interpret the optimization results and discover unknown mapping relationships.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Lei Li, Xueyan Yan, Bingzheng Yang, Sen Yang, Alex A. Volinsky, Xiaolu Pang
Summary: The thermal stability of AlN substrates coated with active metal was studied using first principles calculations. The results showed good thermal stability of the interface at elevated temperatures, and an orientation dependence of the interface elasticity was found. This study is helpful for the development of novel high-power microelectronic devices.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Polymer Science
Alexander P. Kondratov, Alexander A. Nikolaev, Victor G. Nazarov, Vladislav Y. Vereshchagin, Alex A. Volinsky
Summary: Counterfeiting and falsification of brands and products are global problems that impact the development and distribution of high-tech industrial and food products, as well as world economies. One solution to these problems is the development of original packaging with protection elements and labeling that prevent replication and forgery through printing or other methods. The use of new materials with unique optical properties and constantly evolving packaging manufacturing and labeling technologies is the most reliable way to safeguard against counterfeiting.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Review
Materials Science, Multidisciplinary
Hairui Xing, Ping Hu, Chaojun He, Xiangyang Zhang, Jiayu Han, Fan Yang, Run Bai, Wen Zhang, Kuaishe Wang, Alex A. Volinsky
Summary: This paper reviews the methods of strengthening molybdenum alloys with metal oxides and carbides and their effects on alloy structure and properties, providing guidance for the design of high-performance refractory molybdenum alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Hanjing Zhu, Baohong Tian, Yi Zhang, Meng Zhou, Yunzhang Li, Xianhua Zheng, Shengli Liang, Shuang Liu, Wenyu Sun, Yong Liu, Alex A. Volinsky
Summary: With the rapid development of the copper-based composite in the field of electrical contact material industry, the problem of poor arc erosion resistance of the copper-based material becomes more and more prominent, and improving the arc erosion resistance of the copper-based composite is an urgent problem to be solved.
NANOTECHNOLOGY REVIEWS
(2023)