J041031 Effect of high strength on grain refinement of 7075 aluminum alloy

2011 ◽  
Vol 2011 (0) ◽  
pp. _J041031-1-_J041031-5
Author(s):  
Yasuhiro KITANO ◽  
Masafumi NODA ◽  
Kunio FUNAMI
Keyword(s):  
Aluminum Alloy ◽  
Grain Refinement ◽  
High Strength ◽  
7075 Aluminum Alloy

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.

Dynamic Recrystallization Microstructure Grain Size Prediction of 7075 Aluminum Alloy Piston Prepared by Isothermal Extrusion

2014 ◽  
Vol 1042 ◽  
pp. 81-86 ◽  
Author(s):  
Yue Wu ◽  
Wen Lin Chen ◽  
Yan Gao ◽  
Rui Zhou
Keyword(s):  
Grain Size ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Theoretical Calculation ◽  
Grain Refinement ◽  
Extrusion Process ◽  
7075 Aluminum Alloy ◽  
Lateral Extrusion ◽  
Element Simulation ◽  
Isothermal Extrusion

According to the structure features of the piston, the method of combining application of finite element simulation and theoretical analysis was explored to determine the extrusion process program and the extrusion process parameters. Theoretical calculation shows that a longitudinal extrusion and a lateral extrusion can form piston. The result comparing simulative prediction with theoretical calculation demonstrates that there is a good fit between the two and the theoretical calculation is right. The result of simulative prediction demonstrates that the grain size of piston after extrusion is about 17.8 μm and the refining rate reaches 55%. The grain size on both sides of the piston skirt and piston internal floor place is about 27 μm, so the refining effect is less obvious than other parts. However, the grain refinement in the piston pin holes is more obvious, the grain is refined to 13 μm and the refining rate is about 67.5%.The result comparing simulative prediction with the experimental analysis demonstrates that there is a good fit in grain refinement between the two.

scholarly journals Warm sheet metal forming of energy-absorbing elements made 7075 aluminum alloy in the hardened state T6

2022 ◽  
Author(s):  
Karol Jaśkiewicz ◽  
Mateusz Skwarski ◽  
Paweł Kaczyński ◽  
Zbigniew Gronostajski ◽  
Sławomir Polak ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Process Parameters ◽  
Large Deviation ◽  
High Strength ◽  
Motor Vehicles ◽  
Conventional Heating ◽  
7075 Aluminum Alloy ◽  
Shape Deviation ◽  
Energy Absorbing ◽  
Absorbing Elements

AbstractThe article covers experimental research on the forming of products made of 7075 aluminum alloy. This aluminum alloy grade is characterized by high strength, but due to its low formability in T6 temper, its use in the stamping processes of complex structural elements is limited. The authors have manufactured a U-shaped element at an elevated temperature and determined the optimal parameters of the process. Conventional heating of the sheet and shaping it at the temperature of 100 and 150 °C allowed to obtain a product of high strength similar to the T6 state, above 540 MPa. Due to the excessive springback of the sheet during forming, these products were characterized by a large deviation of the shape geometry, exceeding the allowable values of + / − 1 mm. Only the use of an alternative method of heating the sheet to temperatures of 200 and 240 °C (between plates at 350 °C, heating time 2 min, heating rate 1.8 °C/s) allowed to obtain a product that meets both the strength and geometric requirements. The determined optimal process’ parameters were later transferred to the stamping process of elements of a more complex shape (lower part of the B-pillar). The sheet was heated up and formed in the previously pre-heated tools. In the subsequent series of tests, the heating method and the blank’s temperature were being analyzed. In the case of the foot of the B-pillar, it was necessary to lower the initial blank temperature to 200 °C (heating in a furnace with a temperature of 340 °C, heating speed 0.5 °C/s). The appropriate combination of the process parameters resulted in the satisfactory shape deviation and reaching the product’s strength comparable to the strength of the material in as-delivered T6 temper. Using electron microscopy, it was verified that the structure of the finished product contained particles MgZn2 that strongly strengthen the alloy. The obtained results complement the data on the possibility of using 7075 aluminum alloy to produce energy-absorbing elements of motor vehicles.

Microstructure of 7075 Aluminum Alloy by Homogenization

2020 ◽  
Vol 993 ◽  
pp. 138-145
Author(s):  
Yun Fan Dong ◽  
Bing Hui Ren ◽  
Kang Wang ◽  
Jin Feng Leng
Keyword(s):  
Aluminum Alloy ◽  
High Strength ◽  
Phase Evolution ◽  
Optical Microscope ◽  
Second Phase ◽  
7075 Aluminum Alloy ◽  
X Ray ◽  
First Order ◽  
Energy Spectrometer ◽  
Equiaxial Crystal

A 7075 aluminum alloy is widely used in the fields of transportation and aerospace because of its high strength and low density. In this paper, the effect of homogenization annealing on the microstructure of 7075 aluminum alloy was studied. The microstructure and second phase evolution of 7075 aluminum alloy were analyzed by optical microscope (OM), X-ray diffractometer (XRD), scanning electron microscope (SEM), energy spectrometer (EDS) and differential scanning calorimeter (DSC). The results showed that the as-cast microstructure of 7075 aluminum alloy was equiaxial crystal, and non-equilibrium eutectic microstructure Mg(Zn, Cu, Al)2 produced along the grain boundary. In the subsequent first-order homogenization annealing, part of Mg(Zn,Cu,Al)2 was converted to Al2CuMg phase. However, the transformation was not fully complete. Mg(Zn,Cu,Al)2 was then completely converted to Al2CuMg phase in the second order homogenization annealing.

scholarly journals Non-symmetric Hollow Extrusion of High Strength 7075 Aluminum Alloy

2014 ◽  
Vol 81 ◽  
pp. 622-627 ◽  
Author(s):  
Quang-Cherng Hsu ◽  
Yu-Liang Chen ◽  
Tsung-Hsien Lee
Keyword(s):  
Aluminum Alloy ◽  
High Strength ◽  
7075 Aluminum Alloy

Microstructure Control and Mechanical Properties of Multipass Friction Stir Processed High Strength Aluminum Alloy

2012 ◽  
Vol 735 ◽  
pp. 316-321 ◽  
Author(s):  
Yutaka Matsuda ◽  
Goroh Itoh ◽  
Yoshinobu Motohashi
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Base Metal ◽  
Friction Stir Processing ◽  
Superplastic Deformation ◽  
High Strength ◽  
7075 Aluminum Alloy ◽  
Friction Stir ◽  
High Strength Aluminum Alloy ◽  
Equiaxed Grains

Friction stir processing (FSP) causes fine-equiaxed microstructure[1]. In this study, microstructure and mechanical properties of a 7075 aluminum alloy subjected to multipass FSP, MP-FSP, are assessed. A new zone, PBZ, has been discovered between stir zones, SZs. The SZs are composed of fine-equiaxed grains, while PBZs are composed of two types of (fine-equiaxed and coarse-elongated) grains, both of which are still finer than those of base metal. Elongation at 773K of MP-FSPed specimen becomes larger than that of base metal, based on superplastic deformation due to the finer microstructure. Local elongation is smaller in PBZ than in SZ.

Study of Forging Forming of 7075 Aluminum Alloy Bicycle Pedal

2012 ◽  
Vol 579 ◽  
pp. 101-108 ◽  
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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