المؤلفون: Jing Xie, Lin Mei, Xingpin Chen, Yu Cao, Wenjun Lu, Guangjie Huang

المصدر: Materials Research Letters, Vol 12, Iss 5, Pp 373-380 (2024)

مصطلحات موضوعية: Al-Mg alloy, submerged friction stirring, atomic microstructure, cluster, Materials of engineering and construction. Mechanics of materials, TA401-492

الوصف: Utilizing excess vacancy to form effective solute clusters has been considered as a potential strategy to strengthen Al alloys. Herein, we designed a cryogenic submerged friction stir processing, by the one-step process in a short time, to realize the coexistence of grain refinement, high-density clusters, and nanoprecipitates, thus enhancing strength and ductility simultaneously. The atomic information showed the unique formation of high-density clusters (1 ∼ 2 nm), which was related to the strain-induced migration of solute atoms. This study may provide a new strategy for alloys with low alloying content that can be enhanced by forming solute clusters.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/2166-3831Test

الوصول الحر: https://doaj.org/article/0b7efa3ecdc64221813c9929b9604941Test

المؤلفون: Niloofar Haji Abbas Shirazi, Hassan Jafari, Ahmad Sadeghzadeh

المصدر: Journal of Materials Research and Technology, Vol 29, Iss , Pp 5198-5213 (2024)

مصطلحات موضوعية: Magnesium alloy, Friction stirring process, Composite coating, Biodegradation, Hydroxyapatite, Mining engineering. Metallurgy, TN1-997

الوصف: In this study, developing a composite coating on the surface of a biodegradable Mg–5Zn alloy using friction stir process (FSP) is the goal to control biodegradation of the alloy. The experimental procedure starts with the alloy casting, followed by homogenization treatment. Rotational speeds of 800, 1000, and 1250 rpm and 1, 2, and 3 passes using hydroxyapatite (HA) powder are utilized to develop Mg–5Zn/HA composite coating on the surface of the alloy. Microstructure of the as-cast Mg–5Zn alloy and Mg–5Zn/HA composite coating is characterized. Biodegradation behavior of the as-cast and coated alloy is also assessed in simulated body fluid using electrochemical potentiodynamic polarization and impedance spectroscopy tests. The results show that FSP can always modify the surface layer through the dynamic recrystallization process, leading to at least 35% decrease in corrosion rate of the alloy. The potentiodynamic polarization curves of the alloys disclose a break, indicating the impact of passivating behavior. The results also reveal that the rotation speed of 1000 rpm, with the increase in the number of passes, generates more refined microstructure on the surface of Mg–5Zn alloy, which improves its corrosion resistance with decreasing the corrosion rate of the alloy from 28.64 mpy to 0.27 mpy after FSP for three passes at 1000 rpm. In contrast, FSP with the rotation speed of 800 rpm and one pass, besides providing the refined microstructure, develops better distribution of hydroxyapatite particles on the surface, which results in the highest corrosion resistance among the FSPed Mg–5Zn/HA composite coated alloy.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S223878542400454XTest; https://doaj.org/toc/2238-7854Test

الوصول الحر: https://doaj.org/article/3cd9815f915345d3a1ac0a6e3064d488Test

المؤلفون: S.S. Mirian Mehrian, F. Khodabakhshi, M. Rahsepar, M. Mohammadi, A.P. Gerlich

المصدر: Journal of Materials Research and Technology, Vol 28, Iss , Pp 1924-1940 (2024)

مصطلحات موضوعية: Hybrid nanocomposite, Aluminum matrix, Friction stirring, Corrosion resistance, Electrochemical behavior, Mining engineering. Metallurgy, TN1-997

الوصف: This research work involves the advanced microstructural characterization and corrosion resistance of hybrid nanocomposites produced by friction stir-induced reaction in an Al–Mg alloy/TiO2 system tested by potentiodynamic and spectroscopy analyses in the form of polarization and impedance. The impact of TiO2 content and submerged cooling medium were assessed on the subsequent electrochemical behavior of the composites. The electrochemical polarization measurements reveal a substantial variation in the corrosion performance correlated to the chemistry of nanocomposites and aluminum matrix grain structure, depending on friction stirring parameters. The heterogeneity of reinforcing nanoparticles at high fractions can increase the corrosion rate in the stirred region by more than 140 times compared to the primary alloy. This is attributed to secondary phase interfaces and nanoparticle clustering at the grain boundaries, promoting galvanic and pitting corrosion phenomena. In contrast, submerged reactive methods employing a cooling medium led to the formation of ultra-fine/nano-sized cellular structured in-situ hybrid nanocomposites with superior corrosion resistance and an excellent combination of mechanical and chemical properties.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2238785423031769Test; https://doaj.org/toc/2238-7854Test

الوصول الحر: https://doaj.org/article/fb2f18a5d9ac495991fe05ff5def2d5cTest

المؤلفون: Jie Yao, Guoqing Dai, Yanhua Guo, Wenya Li, Zhonggang Sun, Zhikang Shen, Kaiyu Luo, Hui Chang, Lian Zhou

المصدر: Journal of Materials Research and Technology, Vol 25, Iss , Pp 4820-4832 (2023)

مصطلحات موضوعية: Mg–10Li–3Al–3Zn alloy, Friction stirring additive manufacturing, Microstructure evolution, Mechanical properties, Grain refinement, Mining engineering. Metallurgy, TN1-997

الوصف: A comprehensive investigation of friction stirring additive manufacturing (FSAM) Mg–10Li–3Al–3Zn alloy has been conducted to evaluate microstructure evolution and mechanical properties. The results indicated that new intermetallic compounds of Li2MgAl and LiMgZn are precipitated. The microstructure homogeneity is improved and the texture strength of [−1100] is decreased via FSAM. Compared to the base metal, the microhardness of nugget zone has increased by 33%, and the tensile strength of the samples along transverse direction and process direction are 206 MPa and 224 MPa, respectively. The strengthen mechanism of mechanical properties also has been analyzed through phase distribution and grain refinement. The study reveals that FSAM is a significant approach for the additive manufacturing magnesium alloys.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S223878542301339XTest; https://doaj.org/toc/2238-7854Test

الوصول الحر: https://doaj.org/article/73e28bf6835e48d6b666e929c29e2cfcTest

المؤلفون: Wen Feng, Junjie Zhou, Shihao Wang, Ting Sun, Tianyu Zhao, Yingying Jiang

المصدر: Materials, Vol 17, Iss 5, p 1134 (2024)

مصطلحات موضوعية: B10 alloy, friction stirring processing, grain boundary engineering, grain boundary character distribution, thermomechanical processing, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85

الوصف: In this study, the grain boundary character distribution (GBCD) of a B10 alloy was optimized, employing thermomechanical processing consisting of friction stirring processing (FSP) and annealing treatment. Using electron backscatter diffraction, the effects of rotational speed of FSP and annealing time on the evolution of GBCD were systematically investigated. The GBCD evolution was analyzed concerning various parameters, such as the fraction of low-Σ coincidence site lattice (CSL) boundaries, the average number of grains per twin-related domain (TRD), the length of longest chain (LLC), and the triple junction distribution. The experimental results revealed that the processing of a 1400 rpm rotational speed of FSP followed by annealing at 750 °C for 60 min resulted in the optimum grain boundary engineering (GBE) microstructure with the highest fraction of low-Σ CSL boundaries being 82.50% and a significantly fragmented random boundary network, as corroborated by the highest average number of grains per TRD (14.73) with the maximum LLC (2.14) as well as the highest J2/(1 − J3) value (12.76%). As the rotational speed of FSP increased from 600 rpm to 1400 rpm, the fraction of low-Σ CSL boundaries monotonously increased. The fraction of low-Σ CSL boundaries first increased and then decreased with an increase in annealing time. The key to achieving GBE lies in inhibiting the recrystallization phenomenon while stimulating abundant multiple twinning events through strain-induced boundary migration.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/1996-1944/17/5/1134Test; https://doaj.org/toc/1996-1944Test

الوصول الحر: https://doaj.org/article/02af6b5cf7d94f66ae17d718f7efd4abTest

المؤلفون: Sharma Sanjay, Handa Amit, Singh Sahib Sartaj

المصدر: Journal of Mechanical Engineering, Vol 71, Iss 2, Pp 257-290 (2021)

مصطلحات موضوعية: friction stir welding (fsw), friction stir processing (fsp), friction stirring (fs), Engineering (General). Civil engineering (General), TA1-2040

الوصف: Friction stirring based “Green” processes are ruled by geometrical and process aspects of the tools used for generating desired properties in the processed materials. Considering only geometrical aspects, the developments in tool geometry, its modifications with the time, profiles and their corresponding impacts on the property generation are addressed in the present work. It is a censorious and judicious review which consolidates the relevant information apropos of all geometrical aspects of tools and their roles in property generation.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/2450-5471Test

الوصول الحر: https://doaj.org/article/9cc8b309f7b0411aa56cc7d281f2d8edTest

المؤلفون: H. Aghajani Derazkola, F. Khodabakhshi, A.P. Gerlich

المصدر: Journal of Materials Research and Technology, Vol 9, Iss 6, Pp 15273-15285 (2020)

مصطلحات موضوعية: Friction stirring, Forging consolidation, Additive manufacturing, FFTAM, Sheet lamination (SL), Material characterization, Mining engineering. Metallurgy, TN1-997

الوصف: A new solid-state 3D-printing technology based on the friction-stir processing (FSP) treatment and forging consolidation is examined here for additive manufacturing (AM) to produce the tubular components in a layer-by-layer method, yielding extremely refined microstructure and attractive mechanical properties. Therefore, this novel technology can be termed “friction-forging tubular additive manufacturing (FFTAM)” as an alternative approach of sheet lamination (SL) process according to the ASTM designation for AM routes. In this research, the FFTAM process was accomplished to manufacture an Al–Al2O3 composite structure with a tubular shape design and a fully dense construction in the solid-state with continuous metallurgical bonding between the layers under the influence of hydrostatic pressure in combination with high temperatures generated by frictional-heating. A key finding is forming a superb high strength structure with an exceptional ultimate tensile strength (UTS) of around 900 MPa. This can be attributed to the significant grain structural refinement (down to less than 1 μm) and the homogenous incorporation of reinforcing alumina nanoparticles along with severe straining.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2238785420319645Test; https://doaj.org/toc/2238-7854Test

الوصول الحر: https://doaj.org/article/045e77350cd34c23992fbc7ce5f57c84Test

المؤلفون: Khan, H. A., Zafar, N., Hameed, A., Akram, F., Asim, K., Javaid, S., Khan, Abdullah, 1983

المصدر: The International Journal of Advanced Manufacturing Technology. 120(9-10):6635-6646

مصطلحات موضوعية: Blind riveting, Friction stirring, Hard-to-access riveted joints, Joining process, Mechanical characterization, Process development, Aircraft, Dynamic recrystallization, Friction, Infill drilling, Riveting, Strain hardening, Tensile strength, Friction stir, Hard-to-access riveted joint, Mechanical characterizations, Pre-drilled holes, Riveted joints, Riveting process, Friction stir welding

الوصف: This research focused on developing a novel Friction Stir Riveting (FSR) technique, viz., Friction Stir Blind Riveting for pre-drilled holes (FSBR-pH), to improve the mechanical performance of hard-to-access aircraft joints. This objective is realized through a hierarchal four-pronged experimental and numerical analysis approach. Firstly, the existing FSBR process was evaluated where the existing process was found infeasible for pre-drilled holes. The existing process was then modified to develop good quality joints in case of pre-drilled holes. In the second step, a process window was created for FSBR-pH joints through (a) microscopic analysis of joint cross section to observe the presence of any defects/gaps and (b) numerical simulation. Microstructural and mechanical characterization (i.e., tensile strength and microhardness) of the optimized joints were performed in the third step where the presence of dynamic recrystallization was found responsible for the formation of submicron-sized grain in the stir region. The strain-hardening phenomenon was observed in the stir region which occurred due to extensive stirring at high spindle speeds. Finally, a comparison of the developed joints was drawn with existing Blind Riveted (BR) joints in terms of failure modes and tensile strength where the FSBR-pH joints performed better than their existing counterparts.

وصف الملف: print

الوصول الحر: https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-322981Test

المؤلفون: Wilmer Reyes-Feria, Tomás Fernández-Columbié, Luis Hernández-Dorado, Marjoris Utria-Jiménez, Rafael A. Castillo-Diaz

المصدر: Ciencia & Futuro, Vol 9, Iss 3 (2019)

مصطلحات موضوعية: microstructures, friction stirring, conical pin, affected thermo-mechanical zone., Social Sciences, Mining engineering. Metallurgy, TN1-997

الوصف: Hardness and the microstructural variations were established in an AA 1050 series aluminum alloy subjected to friction stir weld. The design of the tool used consisted of a concave shoulder and threaded conical pin combination. Sheets metals were perpendicularly cut; lamination direction 180 mm long and 80 mm wide with 5 mm thickness, they were joined in series of two sheets along by drawing 170 mm weld seams. From a small grains structure and a continuous network of fine particles in α-phase matrix with equiaxial grains, after welding, the affected thermo-mechanical zone shows a reorientation, with some recrystallization degree and the presence of re-precipitated eutectic silicon particles in the affected thermal zone.

وصف الملف: electronic resource

العلاقة: http://revista.ismm.edu.cu/index.php/revistacyf/article/view/1833Test; https://doaj.org/toc/2306-823XTest

الوصول الحر: https://doaj.org/article/3da70fdb085947baaa09459e135edca7Test

المؤلفون: Судариков, Александр Владимирович

المساهمون: Клименов, Василий Александрович

مصطلحات موضوعية: сварка трением с перемешиванием, фрикционная перемешивающая обработка, модифицирование, механические свойства, микроструктура, friction stir welding, friction stirring treatment, modification, mechanical properties, microstructure, 22.04.01, 669.715.055:669.721.5.063

الوصف: Целью настоящей работы является исследование закономерностей фрикционной перемешивающей обработки алюминиево-магниевого сплава АМг5 путем обработки инструментом с различной конфигурацией пина. В ходе исследования были изучены структурные и механические свойства полученных образцов сплава АМг5, полученные фрикционной перемешивающей обработкой. ; The purpose of this work is to study the regularities of the friction mixing processing of the AMg5 aluminum-magnesium alloy by processing with a tool with a different pin configuration. In the course of the study, the structural and mechanical properties of the obtained samples of the AMg5 alloy, obtained by friction stirring treatment, were studied.

وصف الملف: application/pdf

العلاقة: Судариков А. В. Модификация структуры алюминиево-магниевого сплава методом фрикционной перемешивающей обработки инструментами различной конфигурации : магистерская диссертация / А. В. Судариков; Национальный исследовательский Томский политехнический университет (ТПУ), Инженерная школа новых производственных технологий (ИШНПТ), Отделение материаловедения (ОМ); науч. рук. В. А. Клименов. — Томск, 2021.; http://earchive.tpu.ru/handle/11683/66983Test

الإتاحة: http://earchive.tpu.ru/handle/11683/66983Test