Article
Materials Science, Multidisciplinary
Zhongwen Men, Shibo Li, Xiaogang Lu, Yunbo Chen
Summary: Microstructure modification through the addition of expanded graphite can effectively improve the mechanical properties of 20CrMnTi materials. A 1% EG-modified 20CrMnTi achieved significantly higher tensile strength and Vickers hardness.
Article
Materials Science, Multidisciplinary
S. Atefi, M. H. Parsa, D. Ahmadkhaniha, C. Zanella, H. R. Jafarian
Summary: In this study, severe plastic deformation of commercially pure copper rod was achieved using the ECAP-Conform method, and the microstructural and mechanical properties of the samples were characterized. The results showed that the ECAP-Conform method can effectively refine the grain size and improve the mechanical behavior of the copper rod.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Liuwei Zheng, Xiangpeng Zhang, Hongxia Wang, Lifei Wang, Hua Hou, Hang Li, Seon Shin Kwang
Summary: In this study, the microstructure evolution and strengthening mechanisms of homogenized Mg-9Gd-2Nd-1.6Zn-1Zr alloys subjected to various equal channel angular pressing (ECAP) passes were systematically investigated. After 8 ECAP passes, the grain size was dramatically refined, while excellent mechanical properties were achieved after 4 passes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Automation & Control Systems
Serkan Ogut, Hasan Kaya, Aykut Kentli, Mehmet Ucar
Summary: In this study, ECAP, Exp.-ECAP, and HECAP processes were applied to pure copper specimens. An optimized die was used to minimize pressing load and strain inhomogeneity in the specimen. Microstructure analysis and mechanical tests showed that the Exp.-ECAP process yielded better results in grain refinement and mechanical properties.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Hong Xu, Zhi-Peng Guo, Ping-Yu Zhang, You Zhou, Pin-Kui Ma
Summary: The study revealed that the refinement of microstructure in Mg-6Al-1Zn-0.9Sn alloy processed by ECAP is highly dependent on the processing temperature, mainly due to the precipitation of secondary-phase particles. The formation of a 45 degrees texture during the ECAP process significantly influences grain boundary strengthening and yield strength.
Article
Materials Science, Multidisciplinary
D. M. Sekban
Summary: The study compared the effects of quenching and equal channel angular pressing (ECAP) on the microstructure and mechanical properties of low-medium-strength shipbuilding steel. Quenching significantly increased the hardness and strength values of the steel, while ECAP effectively reduced grain size. Both methods improved the performance of the steel, but there were numerical differences in the specific values.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Jianqing Chen, Yehan Su, Qiyu Zhang, Jiapeng Sun, Donghui Yang, Jinghua Jiang, Dan Song, Aibin Ma
Summary: A homogeneously ultrafine-grained (UFG) Cu-38 Zn alloy with an average grain size of 0.64 μm was successfully fabricated by equal channel angular processing (ECAP), exhibiting a significantly enhanced strength-ductility synergy. The observed strength enhancement can be attributed to grain refinement and dislocation strengthening. After annealing, the alloy showed further improved strength with almost unchanged ductility, which is associated with solute/impurity segregation and precipitation phenomena inside the grains.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
S. O. Rogachev, E. A. Naumova, A. Doroshenko, R. D. Karelin, V. S. Komarov, V. S. Yusupov, N. Yu Tabachkova, V. A. Andreev, V. M. Khatkevich
Summary: The effect of equal-channel angular pressing on the structural phase transformations and mechanical properties of a hypoeutectic Al-4Ca-1.3Fe-0.8Mn-0.1Zr-0.1Sc alloy has been studied. Equal-channel angular pressing led to the development of a substructure with increased dislocation density and the refinement of eutectic phase particles. The processed alloy exhibited higher strength and lower ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yumeng Chen, Yuna Wu, Yun Li, Zhiyang Peng, Huan Liu, Aibin Ma, Jinghua Jiang, Ting Yuan
Summary: This study demonstrated that a combination of room temperature equal channel angular pressing and rolling effectively improves the mechanical properties of low lithium content Al-Li alloys, resulting in high ultimate tensile strength, yield strength, and elongation. This improvement is mainly attributed to the fine-grain strengthening and dislocation strengthening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Qiong Xu, Yuhua Li, Hongyan Ding, Aibin Ma, Jinghua Jiang, Guobin Chen, Yegao Chen
Summary: In this study, SiCp/AZ91 composites with enhanced mechanical properties were obtained through a combined process of equal channel angular pressing (ECAP) and rolling. The composite processed with this method showed superior mechanical properties and improved ductility compared to the composite processed solely by rolling, thanks to the homogenized microstructure with refined grains and different crystallographic texture evolution during processing.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Ting Yuan, Yuna Wu, Yang Liang, Qiuning Jiao, Quancheng Zhang, Jinghua Jiang
Summary: By accurately controlling the microstructure through ECAP and post-heat treatment, high strength and improved ductility were achieved in an Al-Mg-Li alloy with a high Li content. Refining coarse S-1 phases, uniformly precipitating fine metastable delta' phase particles, and maintaining ultrafine grains resulted in a combination of high strength (>450 MPa) and good ductility (>13.5%). The heat treatment method was also found to be applicable to other Al-Li alloys for adjusting microstructure and achieving an optimal combination of strength and ductility, expanding applications in the aerospace field.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Liping Bian, Xianwen Liu, Tao Wang, Wei Liang, Yi Zheng
Summary: As-cast and homogenized Mg-8.4Li-3.58Al-0.36Si-0.05Ti-0.01B alloys with and without coarse AlLi and Mg2Si constituent particles were processed by equal channel angular pressing (ECAP) to investigate their microstructural evolutions and mechanical responses. The results showed that the presence of coarse AlLi and Mg2Si particles accelerated the refinement and uniform redistribution of α-Mg dendrites during ECAP, resulting in improved ductility and strength. Additionally, the dynamic precipitation of second-phase particles during ECAP led to the formation of large α-Mg blocks with high strength and reasonable ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
P. Minarik, M. Zemkova, J. Vesely, J. Bohlen, M. Knapek, R. Kral
Summary: The addition of small amounts of zirconium in magnesium alloys containing yttrium and rare-earth elements was found to promote the formation of small secondary phase particles, leading to finer grains, denser distribution, more active grain nucleation processes, suppressed grain growth, and ultimately smaller grain size. This effect was independent of the initial microstructural condition and resulted in improved material strength as demonstrated through various microscopy techniques and mechanical testing. This study shows that the microstructure and texture of MgRE alloys can be effectively tailored by small Zr additions.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Guzide Meltem Lule Senoz, Taha Alper Yilmaz
Summary: Optimization of ECAP parameters improved the mechanical and microstructural properties of Al-Zn-Mg alloy, with the optimal condition identified. Temperature was found to have a significant effect on grain size.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Engineering, Biomedical
Hasan Ghaforian Nosrati, Mahdi Gerdooei, Khalil Khalili, Majid Mohammadi
Summary: This study investigates the application of the ECAP-Conform process for strengthening titanium in the production of dental implants. The results show that after being treated with the ECAP-Conform process, the mechanical properties of the titanium material are significantly improved, and the grain size is reduced. Dental implants produced using this process exhibit higher strength and energy absorption capacity.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(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
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, Biomaterials
Alex A. Volinsky, Oleg V. Kokorev, Ekaterina S. Marchenko, Igor A. Khlusov, Yuri F. Yasenchuk, Alexander N. Monogenov
Summary: Currently, it is relevant to use alternative systems for hepatic metabolism and partial replacement of liver organ failure, especially due to the increase in liver disorders and organ insufficiency for transplantation. Low-cost intracorporeal systems using tissue engineering for hepatic metabolism maintenance before transplantation or complete liver function replacement deserve attention. This study describes the in vivo application of fibrous nickel-titanium scaffolds (FNTS) with cultured hepatocytes, which showed superior liver function and survival in a cirrhosis rats' model compared to hepatocyte injections.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Meng Zhou, Yunzhang Li, Shunlong Tang, Yijie Ban, Yi Zhang, Bin Gan, Xu Li, Lihua Fu, Baohong Tian, Yong Liu, Alex A. Volinsky
Summary: A new Cu-Ni-Si alloy with trace elements of Co and Cr was prepared and studied for its deformation behavior and microstructure transformation during hot compression. The alloy exhibited continuous and discontinuous dynamic recrystallization during deformation, with decreased texture intensity and increased randomness. The degree of recrystallization increased with higher deformation temperature. Additionally, the alloy formed two types of precipitates during hot deformation, which improved its compression resistance.
Article
Materials Science, Multidisciplinary
Ekaterina S. S. Marchenko, Kirill M. M. Dubovikov, Gulsharat A. A. Baigonakova, Ivan I. I. Gordienko, Alex A. A. Volinsky
Summary: Hydroxyapatite coatings were deposited on NiTi substrates using plasma-assisted radio frequency sputtering for different deposition times. Increase in deposition time to 3 hours resulted in formation of a dense hydroxyapatite layer without visible defects. The coating consisted of round grains of different fractions, with the smallest grains observed in the sample deposited for 3 hours. Wettability tests showed that the coating deposited for 3 hours had the highest surface energy, reflected in the proliferation density of the MCF-7 cell line.
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)
