Compound forming of 7075 aluminum alloy based on functional integration of plastic deformation and thixoformation

The deformation and fracture mechanism in 7075 aluminum alloy is discussed based on a field theoretical approach. A pair of peak-aged and overaged plate specimens are prepared under the respective precipitation conditions, and their plastic deformation behaviors are visualized with two-dimensional electronic speckle pattern interferometry (ESPI). The in-plane velocity field caused by monotonic tensile loading is monitored continuously via the contour analysis method of ESPI. In the plastic regime, the peak-aged specimen exhibits a macroscopically uniform deformation behavior, while the annealed specimen exhibits non-uniform deformation characterized by a localized shear band. The occurrence of the shear band is explained by the transition of the material’s elastic resistive mechanism from the longitudinal force dominant to shear force dominant mode. The shear force is interpreted as the frictional force that drives mobile dislocations along the shear band. The dynamic behavior of the shear band is explained as representing the motion of a solitary wave. The observed decrease in the solitary wave’s velocity is accounted for by the change in the acoustic impedance with the advancement of plastic deformation.

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Characterization of the microstructure, texture and mechanical properties of 7075 aluminum alloy in early stage of severe plastic deformation

Materials Characterization ◽

10.1016/j.matchar.2016.07.026 ◽

2016 ◽

Vol 119 ◽

pp. 137-147 ◽

Cited By ~ 39

Author(s):

M. Moghaddam ◽

A. Zarei-Hanzaki ◽

M.H. Pishbin ◽

A.H. Shafieizad ◽

V.B. Oliveira

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Aluminum Alloy ◽

Severe Plastic Deformation ◽

Early Stage ◽

7075 Aluminum Alloy

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Study of Forging Forming of 7075 Aluminum Alloy Bicycle Pedal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.579.101 ◽

2012 ◽

Vol 579 ◽

pp. 101-108 ◽

Cited By ~ 1

Author(s):

Dyi Cheng Chen ◽

Fung Ling Nian ◽

Jiun Ru Shiu ◽

Wen Hsuan Ku

Keyword(s):

Plastic Deformation ◽

Finite Element ◽

Aluminum Alloy ◽

Effective Strain ◽

High Strength ◽

Mold Temperature ◽

Grain Structure ◽

7075 Aluminum Alloy ◽

Rigid Plastic ◽

Plastic Deformation Behavior

Forging is simple and inexpensive in mass production. Metallic materials are processed through plastic deformation. This not only changes the appearance but also changes the internal organization of materials that improve mechanical properties. However, regarding manufacturing of plastic products, many processing factors must be controlled to obtain the required plastic strain and desired tolerance values. In this paper, we employed rigid-plastic finite element (FE) DEFORMTM software to investigate the plastic deformation behavior of an aluminum alloy (A7075) workpiece as it used to forge bicycle pedals. First we use Solid works 2010 3D graphics software to design the bicycle pedal of the mold and appearance, moreover import finite element (FE) DEFORMTM 3D software for analysis. The paper used rigid-plastic model analytical methods, and assuming mode to be rigid body. A series of simulation analyses in which the variables depend on different temperatures of the forging billet, round radius size of ram, punch speed, and mold temperature were revealed to confirm the predicted aluminum grain structure, effective stress, effective strain, and die radial load distribution for forging a bicycle pedal. The analysis results can provide references for forming bicycle pedal molds. Finally, this study identified the finite element results for high-strength design suitability of a 7075 aluminum alloy bicycle pedal.

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Particle cracking and rotation during plastic deformation of 7075 aluminum alloy

Metals and Materials International ◽

10.1007/s12540-009-0591-9 ◽

2009 ◽

Vol 15 (4) ◽

pp. 591-596 ◽

Cited By ~ 2

Author(s):

Soon Gi Lee

Keyword(s):

Plastic Deformation ◽

Aluminum Alloy ◽

7075 Aluminum Alloy ◽

Particle Cracking

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A 3D Coupled Thermo-Mechanical FE Model for Friction Stir Welding of 7075 Aluminum Alloy Plate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.314-316.346 ◽

2011 ◽

Vol 314-316 ◽

pp. 346-350 ◽

Cited By ~ 1

Author(s):

Zheng Hua Guo ◽

Gang Yao Zhao ◽

Li Ming Ke ◽

Li Xing ◽

Shun Feng Zhu

Keyword(s):

Plastic Deformation ◽

Aluminum Alloy ◽

Friction Stir Welding ◽

Bottom Surface ◽

Fe Model ◽

7075 Aluminum Alloy ◽

Alloy Plate ◽

Friction Stir ◽

Plastic Deformation Behavior ◽

Aluminum Alloy Plate

Friction stir welding(FSW), a new solid-state joining process, is wildly used in the fields of aviation, aerospace and other high technology industries for many advantages over traditional fusion welding. Computer modeling is an important tool for the prediction and optimization of the FSW process. According to the characteristics of FSW of 7075 aluminum alloy plate, a 3D coupled thermo-mechanical FE model of this process was built under the ABAQUS/explicit environment based on the solution of several key techniques, such as heat boundary condition treating, material properties definition, ALE adaptive meshing technology, etc., and validated experimentally. Then, simulation and analysis of the complex plastic deformation behavior of the process were carried out. The results show that in the stable stage of the welding, the zone of equivalent plastic deformation decreases from the top surface of weld to the bottom surface; the plastic deformation of metal ahead of the welding tool is larger than that behind the welding tool; moreover the zone of equivalent plastic deformation is concentrated behind the tool.

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