Bibliografias temáticas / Semi-solid extrusion

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Literatura científica selecionada sobre o tema "Semi-solid extrusion"

Autor: Grafiati

Publicado: 14 de dezembro de 2024

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Artigos de revistas sobre o assunto "Semi-solid extrusion"

Uetani, Yasuhiro, Ryotaro Nagata, Hidetoshi Takagi, Kenji Matsuda e Susumu Ikeno. "Effect of Granule Size in Semi-Solid Slurry on Rheo-Extrusion of A7075 Aluminum Alloy". Materials Science Forum 561-565 (outubro de 2007): 291–94. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.291.

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Rheo-extrusions of A7075 aluminum alloy were carried out utilizing semi-solid slurries with different solid granule sizes, which were made by a simple method combined a thin upright tube with a water-cooled tube. Every structure of slurries was granular and average solid granule sizes could be controlled by 0.05 to 0.11mm. These slurries were extruded to round bars at extrusion ratio of 36 and press ram speed of 10mm/s mainly, just after cooling to 833K ( fs > 0.9 ). All of the slurries could easily be extruded to bars with smooth surfaces at much low extrusion forces than those of hot-extrusions. Tensile strength of rheo-extruded bars after solution treatment increased with decreasing of the solid granule size. Peak hardness level at T6 condition equivalent to that of hot-extrusion could be obtained at the finest solid granule size.

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Hu, Lian Xi, Yuan Yuan e Shou Jing Luo. "Fabrication, Microstructure and Mechanical Properties of a SiCw/ZK51A Mg Composite by Semi-Solid Extrusion Directly Following Liquid Infiltration". Solid State Phenomena 116-117 (outubro de 2006): 354–57. http://dx.doi.org/10.4028/www.scientific.net/ssp.116-117.354.

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A 20vol.%SiCw/ZK51A Mg-based composite was fabricated by the process of semi-solid extrusion directly following liquid infiltration. The microstructure and mechanical properties of the composite were investigated in comparison with its squeeze cast and hot extruded counterpart. The results showed that, by semi-solid extrusion, the SiC whiskers were well aligned and microstructure defects associated with the casting technology were eliminated. In addition, as compared with the conventional hot extrusion, the damage to the SiC whiskers during semi-solid extrusion was reduced significantly. Consequently, the composite fabricated by the semi-solid extrusion presented the best whisker reinforcing effect, with its elastic modulus, 0.2% offset yield strength, and ultimate tensile strength achieving 82.5GPa, 383.6MPa, and 431.8MPa respectively.

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Neag, Adriana, Véronique Favier, Régis Bigot e Dan Frunză. "Study on Thixo-Extrusion of Semi-Solid Aluminium". Solid State Phenomena 141-143 (julho de 2008): 659–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.141-143.659.

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Thixo-extrusion processing could become an important technique to extend the range and complexity of extruded profiles. This work presents the results of thixo-extrusion process applied on aluminium alloy and they were carried out with both computer numerical simulation and experimental methods. The thixo-extrusion set-up was made. Backward extrusion tests were particularly studied and simulated using Forge 2005 software. The constitutive equation used for these simulations is based on a micro-macro model for the semi-solid evolution. The constitutive equation parameters were identified due to comparisons of the simulated load-displacement responses with experimental ones for backward extrusion tests on 7075 semi-solid aluminium alloy, for different temperatures.

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Kam, Heng Keong, Chan Chin Wang, Ying Pio Lim e Wen Chiet Cheong. "Study of Forging Process of Yttrium-Modified A356 Aluminum Alloy and Numerical Simulation by Thermo-Viscoplastic Finite Element Method". Key Engineering Materials 701 (julho de 2016): 177–81. http://dx.doi.org/10.4028/www.scientific.net/kem.701.177.

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In this study, A356 aluminum alloy was heated up to semi-solid state and used as a billet for forward and backward extrusion. The workpiece will undergo solidification at the contact between billet and the tools when the material flowing through the die cavity during the semi-solid extrusion. The plasticity of A356 with 0.3wt% Y at semi-solid state was investigated by performing compression test. A numerical simulation code based on thermo-viscoplastic finite element method was developed to simulate the material flow and study the yttrium-modified A356 aluminum alloy under forward and backward extrusion. A minimum average punch strain rate is proposed for semi-solid extrusion.

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Mori, Nanako, Yasuhiro Uetani, Masayoshi Dohi, Kenji Matsuda e Susumu Ikeno. "Rheo-Extrusion of Hypereutectic Al-14.8Si-4.5Cu-1.1Mg Alloy". Advanced Materials Research 409 (novembro de 2011): 57–62. http://dx.doi.org/10.4028/www.scientific.net/amr.409.57.

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Rheo-extrusion of hypereutectic Al-14.8%Si-4.5%Cu-1.1%Mg (in mass%) alloy which is considerably difficult to hot-extrude was tried using semi-solid slurry with fine solid granules and almost finely dispersed primary Si particles, made by a newly developed rotor process. Trials of rheo-extrusion at the constant extrusion ratio of 36 using this semi-solid slurry were carried out at the different conditions of the extrusion temperature and the ram speeds ranging from 520 to 560oC and from 5 to 20mm/s, respectively. Under the all rheo-extrusion conditions, this semi-solid slurry could easily be rheo-extruded to the round bars of 6mm diameter with sound surface at much lower extrusion force than that of hot-extrusion at very low extrusion ratio. In addition, the characteristic age-hardening behavior which is thought to be essential for the rheo-extrusion process has been found out, namely the peak hardness values of aged bars rheo-extruded at 520 and 540oC were considerably higher, 30HV at maximum, than that of a gravity casting.

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Yan, Hong, Ming Fu Fu, Xu Chun Tao e Hong We Hu. "Study on Thixo-Extrusion of Semi-Solid Wrought Magnesium Alloy". Key Engineering Materials 367 (fevereiro de 2008): 103–6. http://dx.doi.org/10.4028/www.scientific.net/kem.367.103.

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The traditional extrusion and thixo-extrusion processes of wrought magnesium alloy were studied with both computer numerical simulation and experimental methods. The thixo-extrusion set-up was made. The constitutive model of semi-solid AZ61 alloy was established in our prior literature. The comparison of two forming processes had been done. Results indicated that smaller load and uniform strain & stress were acquired in thixo-extrusion process. Simulation results were in good agreement with experimental ones.

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Xu, Yong Tao, Tian Yang Guan, Zhi Feng Zhang, Yue Long Bai e Wei Min Mao. "Semi-Solid Rheological Squeeze Casting Process of ZL114A Aluminum Alloy Thin-Wall Complex Casting". Materials Science Forum 993 (maio de 2020): 248–53. http://dx.doi.org/10.4028/www.scientific.net/msf.993.248.

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High-strength aluminum alloy with large-scale and thin-walled complex castings have broad application prospects in aerospace, weapons, electronics, defense and military industries. However, due to the uneven thickness of the plate, the casting defects are inevitable by the ordinary casting method, and it is impossible to accurately control the shape and performance of the casting in the casting process. Previous studies have found that the semi-solid rheological extrusion casting technology with short process and near-end type can help solve this technical problem. Therefore, this paper studies the semi-solid rheological extrusion casting process of thin-walled complex casting of ZL114A aluminum alloy. The combination of numerical simulation and experimental research is used to simulate and optimize the filling and solidification process of thin-walled specimens. Based on this, a semi-solid rheological extrusion casting test was conducted. The result showed that, (1) The optimized model can well reflect the filling and solidification process under different rheological extrusion casting parameters, and obtain defect-free castings through process optimization. (2) The thin-walled parts of the thin plate casting produced by semi-solid rheology extrusion have excellent mechanical property and ductility.

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Liu, Xiaobo, Miao Yang, Dekun Zhou e Yuguang Zhao. "Microstructure and Wear Resistance of Mg2Si–Al Composites Fabricated Using Semi-Solid Extrusion". Metals 10, n.º 5 (2 de maio de 2020): 596. http://dx.doi.org/10.3390/met10050596.

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In situ Mg2Si–Al composites were prepared by using gravity casting and semi-solid extrusion. After P modification, the primary Mg2Si transformed to polygonal blocks. Extraction tests showed that the Mg2Si crystals had octahedral and tetrakaidekahedral morphologies. The semi-solid microstructure of the double-spheroidized α-Al matrix and reinforced-phase Mg2Si was successfully obtained by using semi-solid extrusion. Extraction tests showed that the Mg2Si crystals had a spherical morphology. Dry sliding wear behaviors of in situ Mg2Si–Al composites fabricated by using gravity casting and semi-solid extrusion with isothermal heat treatment holding times of 50, 60, and 160 min against 45 steel, under conditions of different sliding speeds and loads, were investigated. The worn surfaces were analyzed using SEM and EDS techniques. The results showed that Mg2Si–Al composites fabricated by using semi-solid extrusion were superior in terms of wear resistance to Mg2Si–Al composites fabricated by using gravity casting, because the former had uniformly distributed spherical reinforced phase particles of Mg2Si with weaker stress concentration around the particles, delaying the generation and expansion of cracks. The Mg2Si particles were not easily detached from the matrix, and once they fell off, the Mg2Si particles only served as spherical abrasive grains, with relatively small cutting and wear properties for the composite material. It was found that the Mg2Si/Al composite fabricated by using semi-solid extrusion with an isothermal heat treatment holding time of 60 min had the best wear resistance. The failure mechanisms of Mg2Si/Al composites were found to be mainly adhesive wear and abrasive wear.

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Simlandi, Sudip, Nilkanta Barman e Himadri Chattaopadhyay. "Modelling of Extrusion Process for Aluminium A356 Alloy". Solid State Phenomena 217-218 (setembro de 2014): 188–94. http://dx.doi.org/10.4028/www.scientific.net/ssp.217-218.188.

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In the present work, a model is developed to study extrusion process of A356 alloy in semi-solid state. The distinct rheology of the semisolid alloy reduces energy necessity during extrusion process. Accordingly, a proper rheological model of the alloy is considered in the model towards a detailed study of the process. A combination of analytical and numerical solutions is considered for solving the governing equations. The work finally predicts distribution of velocity and shear stress of the alloy under shear in the considered domain. It also predicts the energy requirement during the extrusion process. It is demonstrated that for semisolid extrusion, reasonably less energy is required as compared to a conventional extrusion process Keywords: Extrusion, semi-solid alloy, apparent viscosity, extrusion power

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Wang, Kai Kun, Fu Yu Wang e Yuan Ning Wang. "Investigation on Slurry Filling Sequence during Semi-Solid Forming of Complex Aluminum Part". Materials Science Forum 704-705 (dezembro de 2011): 290–95. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.290.

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Semi-solid forming technology is a short metal processing method between the liquid casting and solid forming. Many forming factors have been found concerning the quality of the forming part. In this study, the influences of slurry filling sequence were investigated in semi-solid forming one complex aluminum part. Two different slurry filling methods were designed. Method one is thixo-upsetting + compound extrusion, method two is thixo-upsetting + extrusion. The experimental results showed that the optimised method of thixo-upsetting + extrusion could be the best strategy in improving the part quality during thixo-forming of aluminum alloy A356.

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Mais fontes

Teses / dissertações sobre o assunto "Semi-solid extrusion"

Cassinath, Zen. "Development of twin screw Rheo extrusion technology". Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/7608.

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Twin Screw Rheo Extrusion (TSRE) is a novel semisolid extrusion process developed at BCAST for producing simple profiles such as rods and wires of light alloys directly from melts with refined microstructures and improved mechanical properties. The process represents a shortened manufacturing route with great savings in investment, energy consumption and operation space. Research was carried out to investigate the feasibility of processing magnesium and aluminium alloys, to obtain the operations for the optimized microstructures and mechanical properties of the final product and to understand the mechanisms governing the evolution of microstructures. Experiments were conducted using an AZ91D magnesium alloy and several aluminium alloys on two specially made twin screw rheo extrusion machines and a range of conditions were tested. Results showed that the TSRE process was feasible for the AZ91D magnesium alloy and aluminium alloys, although modifications were required for processing aluminium alloys as the twin screw material used was found to react with aluminium. Analysis revealed that the extruded samples of both alloys had a uniform fine microstructure in both transversel and longitudinal directions and liquid segregation was limited, due to the application of intensive shearing during slurry making and extrusion. Low extrusion temperature was found to refine the structure and suppress the formation of the eutectic. The eutectic was easily dissolved upon heat treatment resulting in reasonable mechanical properties. Numerical analysis on thermal management was carried out and the results showed that a steady state thermal profile with a temperature gradient between the slurry feeding point and extrusion die could be established, promoting nucleation and preventing the formed solid particles from extensive growth during extrusion, which was confirmed by microstructural observations.

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Kern, Christian [Verfasser]. "Waterless extrusion: Forced fusion of casein-based gel granulates into homogeneous and anisotropic, semi-solid structures / Christian Kern". München : Verlag Dr. Hut, 2020. http://d-nb.info/1220567868/34.

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Aina, Morenikeji. "3D printing of gummy formulations : evaluation of printability and pharmaceutical properties". Electronic Thesis or Diss., Ecole nationale des Mines d'Albi-Carmaux, 2024. http://www.theses.fr/2024EMAC0007.

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L'impression 3D par extrusion semi-solide (SSE 3DP) est une technologie innovante pour la fabrication de médicaments pour la voie orale. Cette technologie est particulièrement indiquée pour la production à basse température de principes actifs sensibles à la chaleur et pour la facilité de sa mise en place en milieu hospitalier afin de permettre la production à la demande avec des dosages adaptés aux patients. Malgré ses nombreux avantages, la SSE 3DP présente des défis importants, notamment une approche par essais-erreurs pour optimiser les formulations et les paramètres rhéologiques associés à l'imprimabilité. La rhéologie, bien qu'efficace pour évaluer rapidement l'imprimabilité, donne lieu à des difficultés d'interprétation des données rhéologiques. Dans cette thèse, grâce à l'analyse en composantes principales, nous avons identifié que plus de 90 % de la variabilité des onze paramètres rhéologiques mesurés était corrélée à trois axes clés : la force d'extrusion, la rétention de forme et l'extrudabilité. Nous avons ainsi proposé une approche simplifiée pour prédire le comportement des formulations pendant le processus d'impression, en utilisant un rhéomètre rotatif classique mais aussi à l'aide d'un texturomètre. Dans un second temps, une évaluation de la qualité des formulations imprimables et des formes imprimées en 3D a été réalisée. Les imprimés par SSE ont réussi les tests standardisés pour l'uniformité des unités de dosage, avec la possibilité d'ajuster les dosages en modifiant les dimensions du modèle 3D. Les formes imprimées ont également montré une stabilité de stockage à court terme, confirmant leur praticité. En conclusion, cette recherche valide l'utilisation de la SSE 3DP pour la production de formes orales en médecine personnalisée
Semi-solid extrusion 3D Printing (SSE 3DP) is an innovative technology for fabricating oral dosage forms. This technology is particularly suited for the low-temperature production of heat-sensitive active ingredients and for its ease of implementation in hospital settings, enabling on-demand production with patient-specific dosages. Despite its many advantages, SSE 3DP faces significant challenges, especially the trial-and-error approach required to obtain appropriate rheological parameters and optimize the printability of formulations. Although rheology provides a quick method for assessing printability, interpreting rheological data can be complex for users without extensive experience in the field. In this thesis, through principal component analysis, we identified that over 90 % of the variability in the eleven measured rheological parameters was correlated with three key axes: extrusion pressure, shape retention, and extrudability. Subsequently, a simplified approach to predict the behaviour of formulations during the printing process, using both a classic rotational rheometer and a texture analyser was proposed. Additionally, a comprehensive evaluation of the quality of the printable formulations and 3D printed dosage forms was performed. The SSE 3D-printed objects passed standardized tests for uniformity of dosage units, with the flexibility to adjust dosages by modifying the dimensions of the 3D model. The printed dosage forms also exhibited short-term storage stability, confirming their practicality. In conclusion, this research validates the use of SSE 3DP for producing oral dosage forms in personalized medicine

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恵子, 名取, e Keiko Natori. "微細複合組織金属の変形機構および塑性加工性に関する研究". Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12867122/?lang=0, 2014. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12867122/?lang=0.

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ヘテロ構造組織を有する鉄・非鉄金属の組織形態に注目して,微視的構造やその挙動が巨視的現象(変形特性,成形性)として発現するメカニズムを解明することを目的とした.鉄系金属ではDual Phase型高張力鋼のスプリングバック現象のひずみ速度依存性,非鉄系金属では半凝固鋳造法と強ひずみ加工を組み合わせた亜共晶アルミニウム合金の衝撃後方押出し成形性に注目した.これらの検討によりいずれの試料においても,結晶粒界よりもスケールの大きいヘテロ構造に由来した変形機構が支配的であることが明らかになった.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University

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Kuo, Jer Liang, e 郭哲良. "Study on hot extrusion process and semi-solid forming of magnesium alloys". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/18588775354046212790.

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博士
國立臺灣科技大學
機械工程系
93
This study mainly investigated the hot extrusion processes of magnesium alloy and the characteristics of this alloy under semi-solid state. Taguchi’s method, ANOVA analysis and Artificial Neural networks (ANNs) are applied to estalsish the analytical model for analyzing the experimental results. The main topics discussed in this study are the fllowing five items. 1. Taguchi’s experimental method is used to carry out the experiments of AZ31 and AZ61 magnesium alloys on the hot extrusion, extrusion ratios of the die are 35.89 and 55.85. From the results of experiment we try to find out the optimal hot extrusion process of magnesium alloy sheet, furthermore, by the factor effect response analysis and ANOVA analysis, the relation between process parameters and products can be derived. 2. According to the process developed on hot extrusion of magnesium alloy sheet. We try to predict the timing of adjusting extrusion speed during extrusion of converging die (die angle is 60°). Moreover, ANNs analysis is applied to the developed multi-speed method, to predict the timing of adjustment of the initial speed of extrusion in the different billet temperatures. 3. For the prupose of establiship a database of hot extrusion process of magnesium alloy, process parameters considered in this study are material types, extrusion ratios, product types, initial extrusion speeds, billet heting temperatures, lubricants, and hold time at specified temperature. Moreover, the mechanical properties of magnesium alloy rod can be predicted. 4. Applying the ANNs analylical model to predict tensile strength of extruded rectangular tube, and to find the relationship between the billet temperatures and tensile strengths. Furthermore, the microstructures of products under different forming temperature were observed. 5. Some experiments are carried out to find the semi-solid temperature range of AZ61 magnesium alloy, and the changes of microstructures of AZ61 magnesium alloy from normal temperature to 400℃, in a hot chamber within the semi-solid state, and under the condition of semi-solid compression and extrusion. In this study a called multi-speed method is developed in the extrusion of magnesium alloy sheet. The parameters that influence the mechanical properties of extruded parts are analyzed syematically, then the database of magnesium alloy extrusion in established. Applying ANNs analytical model, the optimal condition of acquring sound extruded products can be obtained. Finally, the semi-solid temperature range and the characteristics of semi-solid forming of AZ61 magnesium alloy are investigated. We hope the results derived from this study can be a useful reference to the industry of magnesium alloy forming, and researches who engage in the related metal forming field.

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Liang, Da-Lan, e 梁達嵐. "Application of Equal Channel Angular Repetitive Extrusion for Manufacturing Semi-solid Billets of Magnesium Alloy". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/86450271908437335805.

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博士
國立交通大學
機械工程系所
104
Recently, the growing demands for high strength light-weight products in automobile and aircraft industries have pushed the application of magnesium alloys into a unprecedented high level. Magnesium has the lowest density among all the structural metallic materials. Its strength-to-weight ratio is the highest of all the structural metals. Because of the ease of recycling, magnesium alloys attract the attention even in the consumer electronic industry. Fabrication of magnesium alloys are often processed by die casting, casting and sometimes thixo-forming since they have limited ductility at room temperature. All of these manufacturing methods have disadvantages especially when a very thin section or better mechanical properties are required. In this study, semi-solid forming technique which has the advantage of lower forming load and suitable for materials that have little ductility will be adopted for the processing of magnesium alloys. In order to improve the homogeneity of the grain size in the microstructure of the magnesium alloys billets, the alloys are intended to subject severe plastic deformation named ECARE (Equal Channel Angular Repetitive Extrusion), in room temperature. Then with proper heat treatment, the alloys are expected to develop a nano-crystalline structure which in turn will bring better mechanical properties. Finally we hope that we can develop a new commercial process of semi-solid thixo-forming.

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Ilhamto, Nila. "Producing in-house pureed food in long-term care". Thesis, 2012. http://hdl.handle.net/10214/5284.

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There is limited knowledge on provisions used to ensure swallowing safety, nutritional adequacy and sensory acceptability of pureed foods in long-term care homes (LTCHs). The overall aim for this research was to expand knowledge of pureed food production in LTCHs, to study the impact of varying ingredients and preparation on sensory and nutrition and to model perceived oral textures in pureed food. Qualitative interviews with dietary staff (n=53) in 25 LTCHs showed a variety of challenges and practices in production, affecting overall quality. Pureed turkey varying in added liquid, meat muscle and seasoning method and pureed carrots varying in thickener type were evaluated by a descriptive sensory panel (n=10). Results indicate that small formulation changes can have a significant impact on the nutrition and sensory properties of pureed food. Instrumental tests using a viscometer, line-spread test and texture analyzer showed different strengths in predicting variation in orally-perceived textures.
Funding for this project has been provided by Agriculture and Agri-Food Canada through the Canadian Agricultural Adaptation Program (CAAP). In Ontario, this program is delivered by the Agricultural Adaptation Council (AAC).

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Capítulos de livros sobre o assunto "Semi-solid extrusion"

Funk, Nadine Lysyk, Júlia Leão, Thayse Viana de Oliveira e Ruy Carlos Ruver Beck. "Semi-Solid Extrusion (SSE) in Pharmaceuticals". In Additive Manufacturing in Pharmaceuticals, 171–200. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2404-2_5.

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Neag, Adriana, Véronique Favier, Régis Bigot e Dan Frunză. "Study on Thixo-Extrusion of Semi-Solid Aluminium". In Solid State Phenomena, 659–64. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.659.

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Muenstermann, Simon, Rainer Telle, Frederik Knauf e Gerhard Hirt. "Semi-Solid Extrusion of Complex-Shaped Steel Rods Using Ceramic Dies". In Solid State Phenomena, 243–48. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.243.

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Yan, Hong, Ming Fu Fu, Xu Chun Tao e Hong We Hu. "Study on Thixo-Extrusion of Semi-Solid Wrought Magnesium Alloy". In Advances on Extrusion Technology and Simulation of Light Alloys, 103–6. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-467-7.103.

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Firth, Jack, Abdul W. Basit e Simon Gaisford. "The Role of Semi-Solid Extrusion Printing in Clinical Practice". In 3D Printing of Pharmaceuticals, 133–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90755-0_7.

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Zhang, Xiao Hua, Yan Ying Zhang, D. Z. Wu e Shou Jing Luo. "Numerical Simulation of Semi-Solid Billet Preparation by Equal Channel Angular Extrusion". In Solid State Phenomena, 683–88. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.683.

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Koren, Z., H. Rosenson, G. I. Rosen e G. Segal. "Development of Semi-Solid Processes for Hot Extrusion of Magnesium Alloys". In Materials Science Forum, 605–10. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-968-7.605.

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Jiang, Ju Fu, e Shou Jing Luo. "Mechanical Behavior of Processed AZ91D by Equal Channel Angular Extrusion during Semi-Solid Isothermal Compression". In Solid State Phenomena, 530–33. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-26-4.530.

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Ghadiani, S., Hossein Aashuri, Ali Khosravani e A. Foroughi. "Viscosity Estimation of Semi-Solid Alloys by Drop Weight Backward Extrusion Test under High Speed Deformation". In Solid State Phenomena, 379–84. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.379.

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Moradi, M., M. Nili-Ahmadabadi, B. Heidarian e S. Ashouri. "Investigation of Thin Wall Casting Made of Semi-Solid A356 Using Back Extrusion and Die Cast". In Solid State Phenomena, 67–72. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.67.

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Trabalhos de conferências sobre o assunto "Semi-solid extrusion"

Komarasamy, Mageshwari, e Glenn Grant. "Material Synthesis and Advanced Manufacturing Without Melting: Advantages of Bulk, High-Shear Processing". In AM-EPRI 2024, 473–82. ASM International, 2024. http://dx.doi.org/10.31399/asm.cp.am-epri-2024p0473.

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Abstract The next generation of materials and assemblies designed to address challenges in power generation, such as molten salt or supercritical carbon dioxide thermal transfer systems, corrosion, creep/fatigue, and higher temperature operation, will likely be highly optimized for their specific performance requirements. This optimization often involves strict control over microstructure, including homogeneity, grain size, texture, and grain boundary phases, as well as precise alloy chemistry and homogeneity. These stringent requirements aim to meet the new demands for bulk mechanical performance and durability. Some advanced materials, like oxide-dispersion strengthened or high-entropy alloys, necessitate specialized synthesis, fabrication, or welding/joining processes. Traditional methods that involve melting and solidifying can compromise the optimized microstructure of these materials, making non-melting synthesis and fabrication methods preferable to preserve their advanced characteristics. This paper presents examples where solid-phase, high-shear processing has produced materials and semi-finished products with superior performance compared to those made using conventional methods. While traditional processing often relies on thermodynamics-driven processes, such as creating precipitate phases through prolonged heat treatment, high-shear processing offers kinetics-driven, non-equilibrium alternatives that can yield high-performance microstructures. Additionally, examples are provided that demonstrate the potential for more cost-effective manufacturing routes due to fewer steps or lower energy requirements. This paper highlights advances in high-shear extrusion processing, including friction extrusion and shear-assisted processing and extrusion, as well as developments in solid-phase welding techniques like friction stir welding for next-generation power plant materials.

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NEZIC, N. "Development of a new method utilizing semi-solid aluminum wires for extrusion based additive manufacturing". In Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-9.

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Abstract. In the field of additive manufacturing (AM) technologies, the development of metal-based extrusion processes constitutes a significant industrial trend in the recent years. Respective processes are differentiated into powder bed, powder-fed and wire-fed depending on the used feedstock. Among those, powder-fed AM represents the most widely used approach, despite its physical limitations leading to intense thermal gradients and an uncontrollable defective microstructure of produced parts. In this context, extrusion-based AM using a wire semi-finished product in the semi-solid state offers a novel alternative for the direct processing of metallic alloys, avoiding the limitations mentioned. For this reason, a new method for consecutive extrusion of semi-solid AlSiMg aluminum wires has been developed at the Institute for Metal Forming (IFU, Stuttgart, Germany), particularly investigating the influence of the material´s microstructure on the process result. By modifying microstructure via heat treatment, a specific modification of the rheological material behavior can be achieved in terms of a pronounced shear-thinning characteristic, thus systematically affecting extrusion and deposition. First, an experimental setup for continuously extruding semi-sold aluminum wires was realized. Subsequently, experimental investigations were carried out on the extrusion of aluminum wires prepared via the strain induced melt activated (SIMA) process as well as untreated aluminum wires, using a conductively heated printhead concept. The objective was to determine process parameters necessary for successful extrusion and deposition of the modified aluminum material as well as the final proof of concept regarding a specific transformation of the material´s microstructure during the extrusion process.

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Davidson, M., K. Bharath e A. Khanra. "Microstructural Evolution of Al-Cu-Mg Sintered Alloys Processed by Semi-Solid Extrusion Process". In MS&T18. MS&T18, 2018. http://dx.doi.org/10.7449/2018mst/2018/mst_2018_1439_1446.

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Neag, Adriana, Véronique Favier, Regis Bigot, Traian Canta e Dan Frunza. "Experimental Investigation and Numerical Simulation During Backward Extrusion of a Semi-Solid Al-Si Hypoeutectic Alloy". In 10TH ESAFORM CONFERENCE ON MATERIAL FORMING. AIP, 2007. http://dx.doi.org/10.1063/1.2729582.

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Bezditnyi, A. A. "Features of Solid Modeling in Exact Terms". In 32nd International Conference on Computer Graphics and Vision. Keldysh Institute of Applied Mathematics, 2022. http://dx.doi.org/10.20948/graphicon-2022-947-955.

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The basic operations of constructing solid-state geometric objects in the form of an organized threeparameter set of points in three-dimensional space are described based on algorithms implemented in point calculus. These include shaping operations of extrusion and rotation and a kinematic operation with the possibility of axial rotation of the section plane. For the kinematic operation and the extrusion operation, algorithms are given in a general form without reference to specific examples. Moreover, due to the use of point calculus, the proposed algorithms can be generalized to a multidimensional space and allow for an analytical description of multidimensional solid models. Particular attention was paid to the construction of a surface of revolution with a generatrix of a semicycloid in various parametrizations, examples of constructed curves and surfaces were given, and an algorithm for constructing a body of revolution was obtained. Solid models are currently widely used in simulation modeling and differ from geometric modeling and computer graphics by the maximum approximation of the model to its physical prototype. The use of solid modeling methods makes it possible to carry out complex engineering calculations performed during the design process in a semi-automatic mode. The paper gives examples of the use of the obtained geometric algorithms, justifies the use of point calculus as the main tool for the implementation of three-dimensional solid models.

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Hsiang, Su-Hai, e Yi-Wei Lin. "Study on the Mechanical Properties of AZ31 Magnesium Alloy Products Under Hot Extrusion Process". In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95241.

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Magnesium alloy parts have the merits of low specific gravity, high specific strength, electromagnetic wave-proof shelter, and recyclability; therefore, it has been extensively applied to 3C and car industries. However, the processing and forming of magnesium is quite difficult to control due to magnesium’s hexagonal close-packed (HCP) structure, making the slipping face of itself less than the FCC material. Currently, common processing methods of magnesium alloys are die casting, semi-solid forming, and plastic forming. In the employment of a fixed-speed method for extrusion, the extruded sheet had serious defects in the forms of cracks on the surface. Hence, in this research, AZ31 magnesium alloy sheet metals were processed by hot extrusion using a variable speed method. The formability of AZ31 sheets under converging dies was investigated. Three converging dies with semi die angle of 20°, 30°, and 40° were used. Experiments were conducted and analyzed utilizing the Taguchi method. L9 orthogonal array was used to design the experiments under extrusion ratio of 35.9. Four important process parameters considered in this research are the heating temperature of the billet (320°C, 340°C and 360°C), the temperature of the container (300°C, 350°C and 400°C), the initial speed of extrusion (2mm/sec, 3mm/sec and 4mm/sec), and the lubricants (boron nitride, molybdenum disulphide and graphite) applied in the extrusion. The influences of these parameters to the extrusion load and the resulting mechanical properties were investigated. Moreover, the microstructure of the extruded sheets was observed to provide better insight of the formability. As a result, the optimal combinations of the process parameters were determined for the maximum tensile strength.

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Krishnanand e Mohammad Taufik. "Development of a Pellet and Filament Form Integrated Multi-Material Additive Manufacturing Co-Extruder". In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-71044.

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Abstract There are two methods to 3D print a part using extrusion-based additive manufacturing technology namely filament-based and pellets/granules-based. Filament-based extrusion needed a wire form material called a filament, which is pushed by a motor and gear mechanism, into a heating zone. In the heating zone, it converts in semi-solid form and is extruded out of the nozzle to deposit in a layer-over-layer manner. This extrusion strategy needed a non-flexible filament, so it limits the variety of materials. Converting material into wire form also increases the cost of 3D printing. Pellet-based extrusion accepts the material in granules form. It is fed into the heating zone using an extrusion screw. This technology can accept a wide range of materials and eliminate the cost of producing filament. But pellet-based technology is still not being used on 3D printers, on the other hand, filament-based technology in the form of 3D printers is very popular in the market. So, in this study development of noble pellet and filament form integrated multi-material additive manufacturing co-extruder has been presented. The developed co-extruder is capable to accept material in filament form as well as pellet/granules form. This will help to 3D print a particular part with several materials. This hybrid form of the extruder is accommodating the features of both types of extrusion-based additive manufacturing. As per need, one can easily shift from filament extrusion to pellet/granules extrusion using this co-extruder.

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HAN, Chenyang. "Solid state recycling operations for AA7075". In Metal Forming 2024, 201–8. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903254-22.

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Abstract. Solid-state recycling offers a sustainable solution characterized by low energy consumption and heightened product efficiency compared to conventional melting-based methods. Among these, Friction Stir Extrusion processes emerge as an innovative and promising category within solid-state recycling, showcasing the ability to directly repurpose machining chips into solid products. However, as these processes primarily yield semi-finished products -typically in the form of wires, rods, or small billets- subsequent post-recycling forming processes become imperative for achieving net-shape or near-net-shape components. Consequently, a thorough evaluation of the mechanical properties of materials derived from solid-state processes is essential for ensuring the dependable design of process chains. This paper focuses on the calibration of constitutive parameters for raw materials obtained from aluminium chips within a novel process chain rooted in solid-state recycling operations. Cylindrical billets, resulting from friction stir consolidation (FSC), are tested in compressive conditions and investigated with respected of processing conditions to obtain ultra-fined grained materials through sever plastic deformation processes.

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Rautamo, M., HM Tolonen, N. Asinger, H. Ruutiainen, S. Kuitunen, S. Kälvemark Sporrong, M. Sivén e M. Paulsson. "3PC-031 Usability of semi-solid extrusion 3D printing in hospital pharmacy settings to produce personalised oral medications for paediatric patients". In 28th EAHP Congress, Bordeaux, France, 20-21-22 March 2024. British Medical Journal Publishing Group, 2024. http://dx.doi.org/10.1136/ejhpharm-2024-eahp.88.

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