scholarly journals Deformation Behavior and Properties of 7075 Aluminum Alloy under Electromagnetic Hot Forming

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4954
Author(s):  
Zhihao Du ◽  
Zanshi Deng ◽  
Xiaohui Cui ◽  
Ang Xiao
Keyword(s):  
Aluminum Alloy ◽  
Deformation Behavior ◽  
High Speed ◽  
High Strength ◽  
Hot Forming ◽  
Forming Limit ◽  
7075 Aluminum Alloy ◽  
Continuous Dynamic Recrystallization ◽  
High Speed Forming ◽  
Forming Temperature

High-strength 7075 aluminum alloy is widely used in the aerospace industry. The forming performance of 7075 aluminum alloy is poor at room temperature. Therefore, hot forming is mainly adopted. Electromagnetic forming is a high-speed forming technology that can significantly improve the forming limit of difficult-to-deform materials. However, there are few studies on electromagnetic hot forming of 7075-T6 aluminum alloy. In this study, the deformation behavior of 7075-T6 aluminum alloy in the temperature range of 25 °C to 400 °C was investigated. As the temperature increased, the sheet forming height first decreased, then increased. When the forming temperature is between 200 °C and 300 °C, η phase coarsening leads to a decrease in stress and hardness of the material. When the forming temperature is between 300 °C and 400 °C, continuous dynamic recrystallization of 7075 aluminum alloy occurs, resulting in grain refinement and an increase in stress and hardness. The results of numerical simulations and experiments all show that the forming height and deformation uniformity of the sheet metal are optimal at 400 °C, compared to 200 °C.

Hot Deformation Behavior and Fracture of As-Extruded 7075 Aluminum Alloy

2011 ◽  
Vol 291-294 ◽  
pp. 1051-1056
Author(s):  
Zhi Chao Sun ◽  
Jiang Hui Wang ◽  
Yu Wang ◽  
He Yang
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Deformation Behavior ◽  
Fracture Behavior ◽  
Fracture Criterion ◽  
Constant Strain Rate ◽  
7075 Aluminum Alloy ◽  
Damage Factor ◽  
Fracture Criteria ◽  
Forming Temperature

Based on the isothermal compression experiment under constant strain rate, the deformation behavior and flow stress of as-extruded 7075 aluminum alloy at high temperature was studied. Then the fracture behavior and mechanism of 7075 aluminum alloy were investigated, the results showed that longitudinal cracking was easy to occur at a high temperature due to additional tensile stress and low melting point alloy in grain boundaries melting. Through analysis and comparing of C&L and Oyane fracture criteria, it was proved that C&L fracture criterion was more reasonable to predict fracture in 7075 aluminum alloy hot deforming, and the critical damage factor in a forming temperature range(300~450°C) for 7075 aluminum alloy was obtained.

scholarly journals A Physical-Based Plane Stress Constitutive Model for High Strength AA7075 under Hot Forming Conditions

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 314
Author(s):  
Fulong Chen ◽  
Haitao Qu ◽  
Wei Wu ◽  
Jing-Hua Zheng ◽  
Shuguang Qu ◽  
...  
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Plane Stress ◽  
Metal Forming ◽  
Electron Backscatter Diffraction ◽  
High Strength ◽  
Material Model ◽  
Hot Forming ◽  
Industrial Processing ◽  
Average Grain Size

Physicallybased constitutive equations are increasingly used for finite element simulations of metal forming processes due to the robust capability of modelling of underlying microstructure evolutions. However, one of thelimitations of current models is the lack of practical validation using real microstructure data due to the difficulties in achieving statistically meaningful data at a sufficiently large microstructure scale. Particularly, dislocation density and grain size governing the hardening in sheet deformation are of vital importance and need to be precisely quantified. In this paper, a set of dislocation mechanics-based plane stress material model is constructed for hot forming aluminum alloy. This material model is applied to high strength 7075 aluminum alloy for the prediction of the flow behaviorsconditioned at 300–400 °C with various strain rates. Additionally, an electron backscatter diffraction (EBSD) technique was applied to examine the average grain size and geometrical necessary dislocation (GND) density evolutions, enabling both macro- and micro- characteristics to be successfully predicted. In addition, to simulate the experienced plane stress states in sheet metal forming, the calibrated model is further extended to a plane stress stateto accuratelypredict the forming limits under hot conditions.The comprehensively calibrated material model could be used for guidinga better selection of industrial processing parameters and designing process windows, taking into account both the formed shape as well as post formed microstructure and, hence, properties.

Effect of In Situ TiB2 Particles on the Grain Size and Mechanical Properties of 7075 Aluminum Alloy

2021 ◽  
Vol 1035 ◽  
pp. 102-107
Author(s):  
Shao Ming Ma ◽  
Chuan Liu Wang ◽  
Yun Lin Fan
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Aluminum Alloy ◽  
High Strength ◽  
Light Weight ◽  
7075 Aluminum Alloy ◽  
Directional Drilling ◽  
High Strength Aluminum Alloy ◽  
Drill Pipes

Light-weight and high-strength aluminum alloy drill pipes are potential and promising to replace traditional steel drill pipes. In this study, the grain size and mechanical properties of aluminum alloy drilling pipe materials reinforced by in-situ TiB2 particles were studied. The results showed when reinforced by in-situ TiB2 particles the grain size of aluminum alloy materials was refined from 155 m to 57 m and ultimate tensile strength was increased from 590 MPa to 720 MPa. Besides, the results also indicated that the friction coefficient was reduced from 0.99 to 0.50 and thus the abrasion resistance of 7075 aluminum alloy was enhanced by 34 %. This study provided theoretical basis for the application of light-weight and high-strength aluminum alloy drill pipes in directional drilling and ultra-deep wells.

The High-Speed Deformation Behavior of High-Strength Lightweight Al-Li Alloy Sheets

2021 ◽  
pp. 1231-1243
Author(s):  
Ali Abd El-Aty ◽  
Shi-Hong Zhang ◽  
Xunzhong Guo ◽  
Yong Xu ◽  
Ma Yan ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
High Speed ◽  
High Strength ◽  
High Speed Deformation

Research on Synchronized Cooling Hot Forming Process of 6016 Aluminum Alloy

2012 ◽  
Vol 452-453 ◽  
pp. 81-85 ◽  
Author(s):  
Ming He Chen ◽  
Y.Y. Cao ◽  
W. Chen ◽  
Guo Liang Chen
Keyword(s):  
Aluminum Alloy ◽  
Process Parameters ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Alloy Sheet ◽  
Hot Forming ◽  
Al Alloy ◽  
Forming Process ◽  
Process Step ◽  
6016 Aluminum Alloy

In order to improve formability of high strength Al-alloy sheet metal, in this paper, it come up with the synchronized cooling hot forming process. Taking the aluminum alloy of 6016 H18 aluminum alloy, which carried out its technology test by Gleeble3500 hot-mechanical simulator. The process parameters such as deformation temperature T, holding time t and cooling rate v is investigated by the orthogonal test and the microstructure is analyzed simultaneously. The results show that the synchronized cooling hot forming process can be applied to 6016 H18 aluminum alloy, it both improves the formability of 6016 H18 aluminum alloy significantly and obtains the high strength after forming, it can meet the purpose of implementing deformation and enhanced in one process step, the proper combination of process parameters are T=450 °C, t=210 s, v=60 °C/s. Strengthening mechanism is which there is a large number of strengthening phase precipitated from matrix in technology process, the strengthening phases are coarser and the dispersed uniformity is a bit worse compared with that of T4 state.

Pre-production effectiveness increase at high-speed high-strength aluminum parts milling

2021 ◽  
Vol 2021 (2) ◽  
pp. 36-40
Author(s):  
Andrey Nikolaev ◽  
Andrey Savilov
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
High Speed ◽  
High Strength ◽  
Production Effectiveness

The investigation results of tool setup balancing are presented. There is described impact of tool setup imbalance at high-speed aluminum alloy milling upon surface roughness. It is shown that tool balancing in class range investigated ensures specified surface roughness at finishing.

Surface integrity and wear evolution of high strength aluminum alloy after high-speed oblique cutting

2021 ◽  
pp. 135065012110406
Author(s):  
Xiao Yu ◽  
Youqiang Wang ◽  
Ping Zhang ◽  
Yanchun Zhai ◽  
Liying Li
Keyword(s):  
Aluminum Alloy ◽  
Abrasive Wear ◽  
Surface Integrity ◽  
High Speed ◽  
Friction Pair ◽  
High Strength ◽  
Movement Direction ◽  
Residual Tensile Stress ◽  
High Strength Aluminum Alloy ◽  
Friction Testing

In this paper, we present an experimental study on the surface frictional wear mechanism of the high-strength aluminum alloy after high-speed milling. We use a surface profilometer and an X-ray stress tester to characterize the milled surface integrity of the material, and UMT-3 friction testing machine to obtain its surface roughness, oxygen content, hardness, and wear morphology during different wear stages. The results show that milling-induced residual tensile stress makes the cut surface more prone to fatigue cracking and consequently abrasive wear in the initial wear stage. The larger the angle between the friction pair movement direction, the greater the chance of adhesive wear and abrasive wear. A complete friction stage pattern can be obtained at a high load (15 N) and a low sliding speed (0.6 mm/s). The friction pair enters a stable wear stage after 20 sliding cycles. Work hardening constitutes the main driver of stable wear.

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