Article
Chemistry, Physical
Stanislaw Kut, Irena Nowotynska
Summary: In this paper, a comparative analysis was conducted on the impact of the extrusion ratio R on process parameters in the concurrent extrusion of a round bar. The results showed that the increase in the extrusion force was not proportional to the increase in the extrusion ratio, and this relationship could be described by a logarithmic equation. The value of equivalent stresses in the die corner area had a relatively small dependence on the extrusion ratio. However, a higher extrusion ratio of three or more was found to be most advantageous due to the deformation of the die. Based on the wear analysis, it was estimated that increasing the extrusion ratio from 3 to 7 caused a more than 2.5 times increase in tool wear, while using an extrusion ratio of 11 resulted in a 4.5-fold increase in die wear compared to using a ratio of 3.
Article
Chemistry, Physical
Nilam S. Barekar, Ivan Skalicky, Carla Barbatti, Zhongyun Fan, Martin Jarrett
Summary: The Melt Conditioned Direct-Chill (MC-DC) casting technology enables the production of aluminum billets with uniform microstructure and refinement of secondary phases, leading to improved machinability in downstream processing. This method combines conventional direct chill casting with a high shear device for in situ microstructural control, resulting in fine equiaxed dendritic grains and uniform distribution of second phase particles. The benefits include increased heat extraction rate, larger temperature gradient at the solidification front, and shallower sump, which contribute to the desired microstructural features.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Biochemistry & Molecular Biology
Sreekumar Pisharath, Yew Jin Ong, Huey Hoon Hng
Summary: Nanoenergetic materials have attracted a lot of research interest due to their superior combustion characteristics compared to micron-sized materials. This review focuses on the use of fluoropolymers as binders to process nanoenergetic materials into reactive structures, discussing the effects of binders on ignitability and combustion performance.
Article
Automation & Control Systems
Ping Yan, Fazhi Li, Zhiwen Liu, Luoxing Li
Summary: Reasonable design and matching of die structures and process parameters play crucial roles in seam weld quality and variations in extrusion load and exit temperature during magnesium alloy porthole die extrusion. In this study, the effects of four die structure parameters and five process parameters on seam weld quality, exit temperature, and peak extrusion load were investigated using numerical simulation and experimental verification. The optimal parameters for each formability index were determined, and their accuracy was verified through extrusion experiments and wedge expansion tests.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Characterization & Testing
Jayaseelan Veerasundaram, Kalaichelvan Kani, Seeman Murugesan, Ramasamy Nallamuthu
Summary: This study examines the effect of die angle on the quality of extruded products using an experimental approach. The findings suggest that a die angle of 30 degrees combined with a 12:8 extrusion configuration produces the desired quality and fine grain structure.
Article
Engineering, Industrial
S. Sivasankaran, K. R. Ramkumar, Hany R. Ammar, Fahad A. Al-Mufadi, Abdulaziz S. Alaboodi, Osama Mohamed Irfan
Summary: The present study investigated the manufacturing of Al-Zn die-casting alloys through liquid metallurgy route and studied their phase composition, microstructures, and mechanical properties. It was found that the Al-20Zn alloy exhibited improved microstructural observation and mechanical properties, making it suitable for die-casting applications.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Anna Dobkowska, Milena Koralnik, Boguslawa Adamczyk-Cieslak, Dariusz Kuc, Witold Chrominski, Jiri Kubasek, Jaroslaw Mizera
Summary: This study describes the microstructure-dependent corrosion of fine-grained Mg-4Li-3Al-Zn alloys in chloride containing solutions, and reveals the relationship between corrosion behavior and processing parameters (particularly extrusion ratio) and recrystallization stage.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Chemistry, Physical
Anna Dobkowska, Aleksandra Zielinska, Irena Paulin, Crtomir Donik, Maciej Lojkowski, Milena Koralnik, Boguslawa Adamczyk-Cieslak, Krystian Paradowski, Marek Tkocz, Dariusz Kuc, Jiri Kubasek, Matjaz Godec, Wojciech Swieszkowski
Summary: We investigated the microstructure, mechanical, and corrosion properties of an AZ61 alloy extruded using the KoBo method. The KoBo method enables extrusion of AZ61 without preheating and results in significant microstructure refinement. However, this study found that it did not enhance the strength or corrosion resistance of the AZ61 alloy. The continuously precipitated Mg17Al12 phase along the grain boundaries was identified as the main factor affecting the alloy's properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Chemical
Shiyu Jiang, Hesheng Liu, Xingyuan Huang, Zhong Yu, Ruizhe Wang, Yuanshuo Shangguan
Summary: Gas-assisted sheet extrusion is a promising and environmentally friendly method in polymer processing, but insufficient gas intake can be a disadvantage. This study presents an improved die assembly with parallel gas intake to address this issue. By systematically varying the gas inlet pressure, stable sheet extrusion can be achieved with smooth and transparent surfaces, but exceeding the optimum pressure can lead to twisting or breakage of the extruded sheet.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Pharmacology & Pharmacy
Hanpin Lim, Dongyue Yu, Stephen W. Hoag
Summary: The study aimed to develop near-infrared spectroscopy (NIRS) as a potential real-time in-line approach to detect residual crystallinity and carbamazepine (CBZ) polymorphs in its Soluplus (R) dispersions. Different CBZ-Soluplus (R) ratios and processing techniques were found to affect the polymorphism of CBZ.
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Morteza Sarvari, Mehdi Divandari, Hassan Saghafian, Sina Ghaemi Khiavi
Summary: Compound casting is an efficient method for bonding dissimilar metals, and the centrifugal casting process was applied to cast Al/Mg dissimilar bimetals. The results showed that the reaction layer thickness increased with higher preheating temperature and the interface thickness increased with higher melt-to-solid volume ratios. In addition, the interface was not continuously formed when a higher volume ratio was used. The interface of the cast part with a lower volume ratio was found to contain several eutectic structures.
Article
Chemistry, Applied
Eric Kim, Mu Sung Kweon, Sandra Romero-Diez, Anvit Gupta, Xuejia Yan, Caitlin Spofford, George Pehlert, Patrick C. Lee
Summary: Systematic studies were conducted on the foamability of a novel high-melt-strength long-chain branched polypropylene under supercritical CO2. The foam expansion was controlled by adjusting the temperature at the die exit, and the results showed that the expansion ratio was influenced by both the amount of CO2 and the die temperature. Additionally, the cell density was found to be dependent on the pressure drop rate and the dissolved CO2 amount, with the latter showing a more noticeable effect at lower pressure drop rates.
JOURNAL OF CELLULAR PLASTICS
(2021)
Article
Agricultural Economics & Policy
Tassos Haniotis
Summary: This article discusses the role of economic analysis in shaping the reform path of the Common Agricultural Policy (CAP) from 1992 to 2022, based on personal career experience in the European Commission. Economic analysis has played a significant role in influencing reform decisions, assessing the impact of different policy options on agricultural policies, with a particular focus on food safety issues and environmental sustainability considerations.
Review
Chemistry, Multidisciplinary
Ritima Banerjee, Suprakas Sinha Ray
Summary: This review provides an overview of the role of rheology in polymer processing, emphasizing its importance in the development, characterization, and assessment of polymeric material morphologies. It also offers ideas for improving the processabilities of these materials in advanced processing operations.
Article
Engineering, Manufacturing
Philipp Warneke, Annika Bohlen, Thomas Seefeld
Summary: Highly conductive copper alloys are commonly used in casting and welding technology, but their poor wear resistance limits their application in pistons. To improve their lifespan, a new approach using laser melt injection of fused tungsten carbide particles was introduced, which significantly reduced wear and preserved the properties of the substrate.
PRODUCTION ENGINEERING-RESEARCH AND DEVELOPMENT
(2023)
