scholarly journals Research on Al-alloy sheet forming formability during warm/hot sheet hydroforming based on elliptical warm bulging test

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 055023 ◽  
Author(s):  
Gaoshen Cai ◽  
Chuanyu Wu ◽  
Zepu Gao ◽  
Lihui Lang ◽  
Sergei Alexandrov
Keyword(s):  
Sheet Forming ◽  
Alloy Sheet ◽  
Al Alloy ◽  
Sheet Hydroforming ◽  
Bulging Test

Improvement of Mechanical Properties and Corrosion Resistance by Deformation Induced Precipitation in Al-Zn-Mg-Cu Alloy

2017 ◽  
Vol 898 ◽  
pp. 179-190 ◽  
Author(s):  
Jin Rong Zuo ◽  
Long Gang Hou ◽  
Jin Tao Shi ◽  
Hua Cui ◽  
Lin Zhong Zhuang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Thermomechanical Treatment ◽  
High Strength ◽  
Alloy Sheet ◽  
Rolling Temperature ◽  
Al Alloy ◽  
Deformation Degree ◽  
Dynamic Aging ◽  
Final Rolling Temperature ◽  
Final Rolling

A final thermomechanical treatment (FTMT) including peak aging and subsequent dynamic aging was proposed to prepare 7055 Al alloy sheets. The optimization was based on nine well-planned orthogonal experiments. Three main processing conditions in the thermomechanical treatment for obtaining the optimum synthetic properties of 7055 (i.e. preheating temperature, final rolling temperature and deformation degree) were investigated. It was shown that the final rolling temperature is the most important factor among the three parameters, and the optimum properties (yield strength: 651 MPa, ultimate tensile strength: 660 MPa) of 7055 Al alloy sheet can be gained with preheating at 140oC and 40% deformation at 170oC. With dynamic aging, grain boundary precipitates became discontinuous without much coarsening of matrix precipitates, while they were continuously distributed after T6 aging. The present optimal FTMT process can improve the intergranular / exfoliation corrosion resistance without sacrificing the strength compared to T6 tempering. The present FTMT process as a good alternative can produce high-strength Al alloy sheets with high strength and good corrosion resistance efficiently and economically.

Structural Characterization and Corrosion Properties of BTESPT Silane Films on Surface of 2024-T6 Aluminium Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 1111-1116 ◽  
Author(s):  
Ming An Chen ◽  
Xuan Xie ◽  
Guo Fu Xu ◽  
Hui Zhong Li ◽  
Xin Ming Zhang
Keyword(s):  
Structural Characterization ◽  
Water Solution ◽  
Corrosion Current ◽  
Immersion Test ◽  
Alloy Sheet ◽  
Al Alloy ◽  
Entire Surface ◽  
Corrosion Properties ◽  
The Matrix

2024-T6 Al alloy sheet s were modified by bis-[triethoxysilylpropyl] tetrasulfide (BTESPT) silane film to improve the corrosion resistance. Fourier-Transform Reflection Absorption (FTIR-RA) spectroscopy was used for structural characterization of BTESPT silane film formed on surface of the sheet. Potentiodynamic polarization and immersion test in 3.5% NaCl solution were used for evaluating the corrosion performances of the silane film. The results showed that the film formed after curing at 120 °C for 40 min was cross-linked through Si-O-Si and that it was covered on the entire surface of the sheet. The content of elements S and Si on the Al2CuMg particles is a little higher that of on the matrix. The strong peak at 1032 cm-1 indicated that the film was linked to the sheet by Si-O-Al. Compared to the untreated case, the corrosion current density of the sheet treated with the silane film was reduced by close to 2 orders. Treatment of BTESPT silane can provide about 670 h protection of corrosion for the sheet in 3.5% NaCl water solution.

Study on Quality Improvement of W-Shaped Plate of Titanium Alloy Sheet Forming by Laser Shock

Applied laser ◽  
2011 ◽  
Vol 31 (2) ◽  
pp. 112-116
Author(s):  
杨超君 Yang Chaojun ◽  
禹建勇 Yu Jianyong ◽  
叶镇 Ye Zhen
Keyword(s):  
Titanium Alloy ◽  
Quality Improvement ◽  
Sheet Forming ◽  
Alloy Sheet ◽  
Laser Shock

Texture Analysis for Enhancement of R-value in Asymmetrically Rolled Al Alloy Sheet

2019 ◽  
Vol 28 (8) ◽  
pp. 5186-5194 ◽  
Author(s):  
Su Kwon Nam ◽  
Jin-Hyuk Lee ◽  
Gwang-Hee Kim ◽  
Dong Nyung Lee ◽  
Insoo Kim
Keyword(s):  
Texture Analysis ◽  
Alloy Sheet ◽  
Al Alloy ◽  
R Value

High-formability Al alloy sheet produced by asymmetric rolling of strip-cast sheet

2013 ◽  
Vol 574 ◽  
pp. 31-36 ◽  
Author(s):  
Hong-Kyu Kim ◽  
Hyung-Wook Kim ◽  
Jae-Hyung Cho ◽  
Jae-Chul Lee
Keyword(s):  
Alloy Sheet ◽  
Al Alloy ◽  
Asymmetric Rolling ◽  
Strip Cast

Microstructural Changes with Annealing of a Nanostructured Al Alloy Severely Plastic Deformed by Four-Layer Stack Accumulative Roll-Bonding Process

2020 ◽  
Vol 20 (7) ◽  
pp. 4419-4422
Author(s):  
Seong-Hee Lee
Keyword(s):  
Aluminum Alloy ◽  
Annealing Temperature ◽  
Rolling Direction ◽  
Alloy Sheet ◽  
Al Alloy ◽  
Heterogeneous Structure ◽  
Microstructural Changes ◽  
Ultrafine Grained ◽  
Coarse Grains ◽  
Ultrafine Grained Microstructure

Microstructural changes with annealing of a nanostructured complex aluminum alloy fabricated by 3 cycles of four-layer stack ARB process using different Al alloys were investigated in detail. The four-layer stack ARB process using AA1050, AA5052 and AA6061 alloy sheets was performed up to 3 cycles without a lubricant at room temperature. The sample fabricated by the ARB is a multi-layer aluminum alloy sheet in which the AA1050, AA5052 and AA6061 aluminum alloys are alternately stacked to each other. The layer thickness of each alloy became thinner and elongated to the rolling direction with the number of ARB cycles. The grain size decreased with increasing of the number of ARB cycles, and became about 160 nm in thickness after 3 cycles. The complex Al alloy still showed ultrafine grained microstructure to annealing temperature of 300 °C, but it had a heterogeneous structure containing both the ultrafine grains and the coarse grains due to an occurrence of discontinuous recrystallization after 350 °C.

Behaviour of Semisolid Slurry Flows through a Channel

2016 ◽  
Vol 256 ◽  
pp. 146-152 ◽  
Author(s):  
Sudip Simlandi ◽  
Nilkanta Barman ◽  
Himadri Chattaopadhyay
Keyword(s):  
Rectangular Channel ◽  
Conservation Equation ◽  
Sheet Forming ◽  
Metal Sheet ◽  
Structural Parameter ◽  
Semisolid Slurry ◽  
Al Alloy ◽  
Semisolid State ◽  
Small Depth ◽  
Semisolid Alloy

In case of metal sheet forming of alloys in semisolid state, modelling of the process is very essential to predict flow behaviour, temperature distribution of the alloy etc. towards improvement of the product quality and to reduce manufacturing costs. Accordingly, the present work develops a model to predict the behaviour during metal sheet forming of an Al-alloy (A356) in semisolid state. The semisolid alloy passes through a rectangular channel having small depth and larger width. The alloy in semisolid state is cooled from the top at a controlled rate. In the model, the respective flow field is represented by the momentum conservation equation. The non-Newtonian behaviour of the semisolid slurry is incorporated considering the Herschel–Bulkley model. The agglomeration and de-agglomeration phenomena of the suspended particles under shear are represented using a time dependent structural parameter. The temperature field is predicted considering the transient energy conservation equation, and hence the fraction of solid is continuously updated. The solution considers an apparent viscosity of the semisolid alloy as a function of structural parameter, shear stress and shear rate. The governing equations are finally solved by finite difference method. The work predicts velocity, temperature and liquid fraction distribution of the semisolid slurry.

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