scholarly journals Metal Flow Characteristics and Deformation Analyses in Hot Extrusion of Al-Alloy

1995 ◽  
Vol 15 (Supplement2) ◽  
pp. 153-156
Author(s):  
Hiroyuki KINOSHITA ◽  
Kenji NAKANISHI ◽  
Shunpei KAMITANI ◽  
Yong-Ming GUO ◽  
Seigo YONEYAMA
Keyword(s):  
Metal Flow ◽  
Flow Characteristics ◽  
Hot Extrusion ◽  
Al Alloy

The origin of weld seam defects related to metal flow in the hot extrusion of aluminium alloys EN AW-6060 and EN AW-6082

2014 ◽  
Vol 214 (11) ◽  
pp. 2349-2358 ◽  
Author(s):  
A.J. den Bakker ◽  
R.J. Werkhoven ◽  
W.H. Sillekens ◽  
L. Katgerman
Keyword(s):  
Aluminium Alloys ◽  
Weld Seam ◽  
Metal Flow ◽  
Hot Extrusion

scholarly journals Age Hardening of Extruded AA 6005A Aluminium Alloy Powders

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2316
Author(s):  
Feijoo ◽  
Cabeza ◽  
Merino ◽  
Pena ◽  
Rey
Keyword(s):  
Electron Microscopy ◽  
Heating Temperature ◽  
Hot Extrusion ◽  
Atomic Ratio ◽  
Age Hardening ◽  
Al Alloy ◽  
Ingot Metallurgy ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Peak Aging

Pre-alloyed micron-sized 6005A Al alloy (AA 6005A) powders, with a Mg/Si atomic ratio of 0.75, obtained by high pressure inert gas atomization were consolidated by uniaxial cold pressing at 200 MPa into cylindrical Al containers and hot extruded at 450, 480 and 500 °C with an extrusion rate of 7:1, followed by artificial T6 precipitation hardening. Ageing conditions were varied between 170 °C and 190 °C and times of 6, 7 and 8 hours. The microstructure of the extruded profiles was analysed using X-Ray diffractometry (XRD), light optical microscopy (LOM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Differential scanning calorimetry (DSC) was used to study the possible phase transformations. After our results, the peak-aging hardness condition was achieved at 180 °C for 6 h. Mechanical properties of the powder metallurgy (P/M) aluminium alloys consolidated by hot extrusion were superior to those of the extruded profiles of wrought alloy using conventional ingot metallurgy (I/M) billets. AA 6005A wrought P/M alloy via T6 heat treatment shown yield stress of 317 MPa and elongation of 21% at the extrusion pre-heating temperature of 500 °C.

Non-Uniform Deformation Characteristic of in 690 Superalloy Tube in Glass Lubricated Hot Extrusion

2010 ◽  
Vol 145 ◽  
pp. 332-339 ◽  
Author(s):  
Chao Yang Sun ◽  
Bin Liu ◽  
Qing Dong Zhang ◽  
Rui Li
Keyword(s):  
Strain Distribution ◽  
Adaptive Mesh Refinement ◽  
Metal Flow ◽  
Deformation Characteristic ◽  
Hot Extrusion ◽  
Adaptive Mesh ◽  
Uniform Deformation ◽  
Deformation Index ◽  
Deformation Problem ◽  
Preheating Temperature

A two-dimensional axi-symmetric finite element model for the tube hot extrusion process was developed based on Deform-2D software by consideration of the billet transfer, glass lubrication and the constitutive characteristics of IN 690 superalloy. An enhanced technique for adaptive mesh refinement (AR) is used to solve the large deformation problem. This model was then used to study the effect of boundary conditions and process parameters in tube hot extrusion. The Non-uniform deformation index as the representative parameter, which denotes the non-uniform deformation during the steady state of tube hot extrusion, is presented accordance to the feature of metal flow at deformation zone. The bigger of Non-uniform deformation index, the worse of non-uniform strain distribution. When the non-uniform deformation index getting smaller, the equivalent strain distribution along the length and cross section become more uniform and better product quality could be obtained. An increase in the billet and die preheating temperature could reduce the non-uniform deformation index individually. But the billet and die preheating temperature should not be too high. The increase of friction coefficient, the non-uniform deformation index also increased, which indicate appreciable results of metal flow. With the ram speed increase, the non-uniform deformation index decreases, but too fast speed is inadmissibility.

Application of Simulation Technology to Hollow Die Extrusion

2007 ◽  
Author(s):  
N. Takatsuji ◽  
T. Inagaki ◽  
S. Murakami ◽  
K. Matsuki
Keyword(s):  
Sliding Friction ◽  
Metal Flow ◽  
Fem Analysis ◽  
Hot Extrusion ◽  
Equivalent Strain ◽  
Extrusion Pressure ◽  
Simulation Technology ◽  
Hole Filling ◽  
Filling Process ◽  
Die Extrusion

In recent years, the application of various simulations in hot extrusion of aluminum alloys has proven useful. However, the most of them are generally applied in the field of steady metal flow conditions with solid die extrusion. In this paper, the simulation technology is applied to hollow die extrusion. Especially, the effects of the taper port-hole shapes on the extrusion pressure-stroke diagrams and the metal flows are investigated experimentally and theoretically. Taper port-hole shapes are useful for the reduction of the extrusion pressure in comparison with straight port-hole shape, because the extrusion pressure in the port-hole filling process is decreased by the reduction of the sliding friction, and the extrusion pressure in the welding chamber filling process is decreased by the reduction of equivalent strain rate in the port-hole and the welding chamber. FEM results by FEM analysis code added with special know-how show a close match with the experimental results. Therefore, we are able to predict the extrusion pressure and the metal flow through the port-hole and the welding chamber by this simulation technology.

Friction Stir Spot Welding of AA2024-T3 with Modified Refill Technique

2020 ◽  
Vol 835 ◽  
pp. 274-287
Author(s):  
Mahmoud Hussin Fahmy ◽  
Hamed A. Abdel-Aleem ◽  
Nahid Ahmed Abdel-Elraheem ◽  
M.R. El-Kousy
Keyword(s):  
Spot Welding ◽  
Metal Flow ◽  
Vertical Direction ◽  
Friction Stir Spot Welding ◽  
Weld Strength ◽  
Al Alloy ◽  
Exit Hole ◽  
Two Stage ◽  
Friction Stir ◽  
Second Stage

The quality of welded joints of FSSW is mainly dependent on the processing parameters while the main disadvantage of this process is the creation of an exit hole. Process parameters, namely tool dimensions, tool rotational speed, and stir time were changed and their impact on bond dimensions and weld strength was investigated using 2024-T3 Al Alloy. Macro- and microstructures of the welded samples were examined; shear fracture loads were measured and the optimum set of operation variables was determined. To decrease the exit hole of the first stage the present paper proposes a modified two-stage weld-refill process employing the same welding machine. In this work, this two-stage process was referred to as reversed friction stir spot welding (ReFSSW). In the second stage, a smaller pin was used and the shoulder diameter was designed such that to force the metal of the upper plate to flow towards the exit hole of the first stage decreasing its dimensions. The metal flow in the second stage was evaluated by examining the microstructure of the metal that filled the exit hole of the first stage. Thin stir zone was found around the pin of the second stage followed by thermomechanically affected zone consisting of grains elongated in the vertical direction. The proposed process resulted in smaller exit hole dimensions and consequently higher mechanical properties compared with the conventional single-stage FSSW.

Characteristics of Capillary Tube of A3003 Al Alloy Fabricated by Hot-Extrusion Process

2014 ◽  
Vol 6 (10) ◽  
pp. 2244-2248
Author(s):  
Dae-Hwan Kim ◽  
Hyun-Ju Jung ◽  
Seung-Hwa Choi ◽  
Yong-Sek Park ◽  
Su-Gun Lim
Keyword(s):  
Capillary Tube ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Al Alloy

Influence of ECAP Routes on the Microstructure and Mechanical Properties of Hot Extruded 3003 Al Alloy

2007 ◽  
Vol 124-126 ◽  
pp. 1397-1400 ◽  
Author(s):  
Byoung Soo Lee ◽  
Hoon Cho
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Hot Extrusion ◽  
High Strength ◽  
Al Alloy ◽  
Deformation Structure ◽  
Ecap Processing ◽  
Fine Grained ◽  
Strain Process ◽  
Equiaxed Grains

The microstructures and mechanical properties of unidirectional deformation structured Al alloy during ECAP with various deformation routes were investigated. In order to fabricate unidirectional deformation structure for Al alloy, hot extrusion was carried out. It was found that the deformation route A in ECAP routes is the dominant route for the grain refinement and strengthening. In deformation route A, the high strength ultra-fine grained Al alloy with a grain size of ~ 200 nm was obtained due to the accumulation of consecutive strain process. In contrast, the strength of ECAP’ed Al alloy produced via deformation route C was greatly increased after one pass because the grains were strained and cancelled each pass. By contrast, the equiaxed grains were obtained in deformation route BC because the sample was rotated 90 O in the same sense in each pass. The deformation route BC was superior to the deformation route C because the deformation route BC was more favorable than the deformation route C in the accumulation of consecutive strain. It is also found that unidirectional deformation structured Al alloy via hot extrusion shows similar grain refinement tendency with equiaxed structured Al alloy during ECAP processing.

scholarly journals Assessment of Metal Flow Balance in Multi-Output Porthole Hot Extrusion of AA6060 Thin-Walled Profile

Metals ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 462 ◽  
Author(s):  
Xin Xue ◽  
Gabriela Vincze ◽  
António Pereira ◽  
Jianyi Pan ◽  
Juan Liao
Keyword(s):  
Metal Flow ◽  
Hot Extrusion ◽  
Flow Balance ◽  
Thin Walled

Preparation of Cu–Al2O3 bulk nano-composites by combining Cu–Al alloy sheets internal oxidation with hot extrusion

2015 ◽  
Vol 633 ◽  
pp. 323-328 ◽  
Author(s):  
Fengzhang Ren ◽  
Aijuan Zhi ◽  
Danwen Zhang ◽  
Baohong Tian ◽  
Alex A. Volinsky ◽  
...  
Keyword(s):  
Internal Oxidation ◽  
Hot Extrusion ◽  
Nano Composites ◽  
Al Alloy
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