scholarly journals Micro-Extrusion Process And Microstructure Evolution of Miniature Heat Pipe In 6063 Aluminum Alloy

2021 ◽  
Author(s):  
Yongda Liu ◽  
Jie Xu ◽  
Zhengwu Zhang ◽  
Gang Liu ◽  
Debin Shan ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Size Effect ◽  
Heat Pipe ◽  
Microstructure Evolution ◽  
Material Flow ◽  
Shape Control ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
6063 Aluminum Alloy ◽  
Ram Speed

Abstract Micro-extrusion process of miniature heat pipe with axial micro grooves is particularly difficult due to ultra-large extrusion ratio and complex cross-sectional shape. In this study, the shape control of a miniature heat pipe in 6063 aluminum alloy with boundary dimension of 5×4 mm has been successfully realized during micro-extrusion. Micro-extrusion process and microstructure evolution of the miniature heat pipe were investigated by the combination of finite element (FE) analysis with experiments. The results show that material flow deformation behavior during micro-extrusion is highly affected by size effect, and lower ram speed is conductive to forming integrity, dimension accuracy and surface quality of the heat pipe profile. The primary mechanism for micro-extrusion failure of micro-grooves is severely more uneven material flow between the micro rib and base region at higher ram speed, which is caused by size effect and results in shear deformation and even fractures of micro rib. Further research shows that, compared to the extrusion using as-cast billets, much coarser grains were obtained after micro-extrusion using as-extruded billets at an ultra-large extrusion ratio of 205. Besides that, the entirely different texture components after extrusion were obtained instead of the typical < 100 > //ED or < 111 > //ED fiber texture components. These atypical texture components can be regarded as texture deviating from ideal texture by a certain angle (15° or 20°) along φ axis or φ1 axis.

Effect of Granule Size in Semi-Solid Slurry on Rheo-Extrusion of A7075 Aluminum Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 291-294 ◽  
Author(s):  
Yasuhiro Uetani ◽  
Ryotaro Nagata ◽  
Hidetoshi Takagi ◽  
Kenji Matsuda ◽  
Susumu Ikeno
Keyword(s):  
Aluminum Alloy ◽  
Solution Treatment ◽  
Hot Extrusion ◽  
Granule Size ◽  
Extrusion Ratio ◽  
Peak Hardness ◽  
Simple Method ◽  
Ram Speed ◽  
Semi Solid ◽  
Solid Granule

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.

Extrudability and Bonding Strength of Copper Clad Aluminum Alloy Composites Produced by Indirect Extrusion Process

2007 ◽  
Vol 26-28 ◽  
pp. 417-420
Author(s):  
Hyouk Chon Kwon ◽  
Taek Kyun Jung ◽  
Jang Won Kang ◽  
H.J. Lee ◽  
K.H. Kim ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Diffusion Layer ◽  
Bonding Strength ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Core Material ◽  
Surface Fracture ◽  
Sem Observation ◽  
The Core ◽  
Sheath Material

This paper described extrudability and bonding strength of copper (TPC) clad aluminum alloy (pure Al, Al3003, Al5005, and Al7072) composites produced by indirect extrusion at 350°C with extrusion ratio of 21.39. Conical typed die with semi angle of 30°. Carbon oil was used to reduce the friction between billet/sleeve and billet/die. Maximum extrusion pressure was estimated to 491MPa for the Cu/Al, 714MPa for the Cu/Al3003, 820MPa for the Cu/Al5005, and 743MPa for the Cu/Al7072 alloy composites. No surface fracture was observed. From SEM observation, diffusion layer between the sheath material and the core material of extruded composites is observed and its thickness was measured to about 1.5㎛. The bonding strength was estimated to 65MPa for the Cu/Al, 89.3MPa for the Cu/Al3003, 70MPa for the Cu/Al5005, and 75MPa for the Cu/Al7072 alloy composites.

scholarly journals Microstructure and Its Influence on the Welding Quality of 6063 Aluminum Alloy Porthole Die Extrusion

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6584
Author(s):  
Shikang Li ◽  
Luoxing Li ◽  
Zhiwen Liu ◽  
Guan Wang
Keyword(s):  
Aluminum Alloy ◽  
Dynamic Recrystallization ◽  
Welding Quality ◽  
3D Numerical Modeling ◽  
Porthole Die ◽  
Average Grain Size ◽  
The Matrix ◽  
6063 Aluminum Alloy ◽  
Ram Speed

Extrusion experiments and 3D numerical modeling were conducted to investigate the dynamic recrystallization and welding quality of a 6063 aluminum alloy hollow square tube extruded by a porthole die at the ram speeds of 3 mm/s, 7 mm/s, 9 mm/s and 11 mm/s. The results showed that average grain size of hollow square tube extruded at the ram speed of 7 mm/s was the smallest. The profile extruded at the ram speed of 3 mm/s exhibited the highest expansion ratio. Dynamic recrystallization (DRX) fractions were highly variable at different ram speeds. DRX fractions in the matrix zones were higher than those in the welding zones, resulting in smaller grain sizes in the matrix zones. Mechanical properties in the welding zones and matrix zones was different. A local strain concentration would occurred during expansion, which would affect the welding quality. Finally, it was found that the uniform microstructure near the welding line would also affect the welding quality.

Studies on Process Parameters for Aluminum Extrusion of Slide Rails

2013 ◽  
Vol 467 ◽  
pp. 392-397 ◽  
Author(s):  
Shun Yu Shao ◽  
Wen Yen Wang ◽  
Yi An Chen
Keyword(s):  
Aluminum Alloy ◽  
Process Design ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Roll Forming ◽  
Aluminum Extrusion ◽  
Extrusion Speed ◽  
Extrusion Die ◽  
Simulation Results ◽  
Product Weight

Slide rails are usually fabricated by roll forming and are used in kitchenware and cabinets mostly. However the product weight of slide rails is increased because larger dimensions are required to bear larger load when they are used in dies and warehouses. International suppliers start to develop Aluminum slide rails to decrease the product weight in recent years. The manufacturing and functional feasibility of Aluminum slide rail were discussed in this study. The Aluminum slide rail was designed according to ready-made slide rail, and the aluminum alloy was selected with required mechanical properties. The suitable extrusion die was designed and direct extrusion parameters of extrusion ratio, extrusion temperature, extrusion speed and extrusion load are also considered. The extrusion process of aluminum alloy was simulated by CAE software to check the mold and process design. The extrusion part of aluminum slide rail was carried out by extruder to verify the simulation results.

Effect of Porthole Design and Welding Chamber Dimensions on Material Flow and Weld Deformability of Extruded Aluminium Profiles

2012 ◽  
Vol 504-506 ◽  
pp. 523-528 ◽  
Author(s):  
Lorenzo Donati ◽  
Nooman Ben Khalifa ◽  
Luca Tomesani ◽  
A. Erman Tekkaya
Keyword(s):  
Aluminum Alloy ◽  
Process Control ◽  
Surface Quality ◽  
Material Flow ◽  
Thermal Field ◽  
Thermal Conditions ◽  
Extrusion Ratio ◽  
Die Design ◽  
Dissimilar Welding ◽  
Quality Profile

Aim of the work is to investigate different strategies in balancing material flow during direct extrusion through porthole dies. Two AA6082 hollow profiles were simultaneously extruded by a single die with different portholes extrusion ratio, dissimilar welding chambers and different bearing lengths. A strict process control was realized by measuring thermal conditions in the die by means of 6 thermocouples and on the profiles by a self calibrating pyrometer for aluminum alloy applications. Several billets were extruded at different ram speeds (2 to 7 mm/sec) and the effect of die design on surface quality, profile lengths and thermal field was recorded. The profiles were then sectioned and the position of the seam welds in the profiles identified and compared also with the profiles tip.

Quantitative Study on the Effect of Extrusion Process of AZ80 Magnesium Alloy

2010 ◽  
Vol 129-131 ◽  
pp. 1191-1195
Author(s):  
Yan Lou
Keyword(s):  
Set Theory ◽  
Rough Set ◽  
Rough Set Theory ◽  
Extrusion Process ◽  
Average Weight ◽  
Characteristic Parameters ◽  
Billet Temperature ◽  
Az80 Magnesium Alloy ◽  
Ram Speed

By data mining from 3DFEM simulation and Rough Set Theory (RST), it was performed that the extrusion process and die structures effect on the quality of AZ80 magnesium extrudate. The weights of the effect can be obtained. The results show that the effect of the billet temperature on the product quality is dominate, and its average weight is 0.27. The second important parameter is the ram speed and its average weight is 0.22. In addition, it was also found that the effect of the die characteristic parameters on the extrudate is insignificant.

Sign in / Sign up

Export Citation Format

Share Document