Deformation Character of the Aluminum Alloy AA 6063 Depending on the Homogenization State (original) (raw)
Related papers
2021
The hot deformation behavior of the heat-treated AA6061 and AA 6063 aluminum alloys by T6-1, T6-2 artificial aging treatment, and O annealing treatment were studied by compression testing over a temperature range of 350–550°C and strain rates of 0.005-0.1 s-1. It was observed that the flow stresses of the studied aluminum alloys treated by the T6-1 and T6-2 heat treatments were significantly higher than those of the O annealing treatment. Moreover, the stress-strain curves of the heat-treated alloys by the T6-1, T6-2, and O heat treatments demonstrated significant softening during deformation at the lowest strain rate under any of the deformation conditions. For several strains, the activation energy of hot deformation was specified and obtained to vary significantly with strain for the heat-treated alloys by the T6-1 and T6-2 treatments. The stress-strain data calculated from a linear equation, with strain-dependent parameters, shows a great fit with the experimental data for the h...
Various AA3xxx alloys (e.g. AA3003, AA3102) were homogenized in the temperature range of 500-600°C for various times to produce different volume fractions and distribution of dispersoids in the microstructure. After the homogenization treatment, the materials were compression tested in the temperature range of 300 to 600 °C with strain rates in the range of 10-1 to 10 s-1 to simulate hot extrusion conditions. The flow stress model based on the work of Chen and Kocks was found to well describe the experimental results for the steady-state flow stress. It was observed that the steady state flow stress was dependent on the manganese solid solution level and the distribution of the dispersoids. Finally, a series of trials was conducted on a fully instrumented extrusion press to determine the effect of homogenization treatment on the extrusion force. It was found that the extrusion force could be correlated very well with the steady-state flow stress values predicted by the Kocks/Chen model. A simple relationship was developed to predict extrusion pressure based on the prior homogenization treatment.
The effect of deformation degree on the microstructure of the 6060 aluminium alloy
Archives of Materials Science and Engineering, 2017
Purpose: All results obtained in the present study allowed to analyse the changes in the microstructure and texture of the commercial 6060 aluminium alloy, after deformation process by severe plastic deformation. There were compare two deformation degree samples received by cumulative hydrostatic extrusion. Design/methodology/approach: The samples of the 6060 alloy were subjected to a onepass and three-passes extrusion process and next the age hardening. The microstructure changes were investigated by using transmission and scanning electron microscopy. To study the texture evolution the X-ray diffraction were made. Findings: The microscopic observations results presented the refinement of microstructure as a result of deformation process. The evolution of fibrous character of texture was observed. There were noted the disappearance of fibrous component <100> during subsequent deformation processes and generation the fibrous component <111> after high deformation degree....
IMPROVEMENT ON THE STRENGTH OF 6063 ALUMINUM ALLOY BY MEANS OF SOLUTION HEAT TREAMENT
The paper examines the solution heat treatment of an extruded 6063 aluminum alloy. The study shows that the strength and fracture resistance of this metal alloy can be influenced to an appreciable extent by the solution heat treatment used in this investigation. The ultimate tensile strength (UTS) increases as the solution time increases from 6 to 20 hours for treatment temperature of 90 o C. The maximum UTS (198.8MPa and 188.6 MPa) occur at 120 o C and 150 o C respectively at the solution holding time of 10hours. While, at 120 o C and 10hrs, the UTS are relatively the same as the as-received specimen, though the latter exhibits a higher fracture stress. Annealing at 470 o C results to lower UTS value (114.3MPa) and poor fracture resistance (522MPa). The results of the experiment are found to be in near perfect agreement with Voce Empirical Model. These observations have shown that solution treatment at 150 o C for 10 hrs can produce significant plastic flow before fracture of 6063 aluminum alloys. Irrespective of the treatment process adopted, the stress-strain behavior is essentially the same for strains within the range 0 0.005.
European Journal of Science and Technology, 2021
Aluminium alloys are one of the most preferred materials in the automotive industry due to their properties such as easy recyclability, easy formability and high specific strength. 6XXX alloys are especially used in automotive parts due to their good mechanical properties such as high corrosion and high fatigue strength.6XXX alloys are cast as billets or ingots by continuous casting methods. The alloys are subjected to homogenization heat treatment and shaped by extrusion, respectively. During extrusion forming, fibers are formed in the profile in the direction of extrusion. It has been observed that the coarseness of these fibers formed in the extrusion process causes undesirable deep tears, cracks and distortion of surface when the aluminium profiles are subjected to the cold forming process. In this study, cracking and surface deformations are completely eliminated that occurred after cold forming thanks to alloy improvements and heat treatment. The cold forming process is modeled with the finite element method in order to control surface deformations due to cold forming. Alloy enhancement and homogenization heat treatment applied samples were subjected to cold forming process. As a result, the homogenization heat treatment applied to the part produced from the alloy with improved chemical composition eliminated the deep tears, residual stresses and invisible heterogeneities in the grain structure.
Bendability and Fracture Behaviour of Heat-treatable Extruded Aluminium Alloys
2010
Three-point bending tests of extruded aluminium alloys have shown lower bendability when the bending axis is aligned with the extrusion direction compared to the transverse direction. In an attempt to explain the observed anisotropy in the mechanical behaviour, the microstructure of underaged and overaged fibrous extruded 7xxx aluminium alloys has been studied with respect to distribution of primary particles and fracture propagation. The microstructure of the deformed materials reveals different fracture mechanisms depending on the direction of the bending axis. These mechanisms are independent of the ageing condition, indicating that the grain morphology and alignment of primary particles give rise to the observed anisotropy.
2019
This study aims to understand the influence of heat treatment on behavior of AA6061 aluminum alloy at room temperature for various heat treatment. Two experimental parameters for this alloy are defined: micro hardness and the electrical resistivity, as a function of heat treatment at ambient temperature. The results show that the heat treatment conditions have an effective influence in mechanical properties of Al-Mg-Si aluminum alloy. This variation of the mechanical properties is the result of microstructural changes which have been observed using optical microscopy. When the material is subjected to a solution heat treatment followed by quenching and artificial aging, its mechanical properties, especially micro hardness and electrical resistivity, reach their highest levels and become very good compared to the other heat treatment applied to the same alloy.
Study of the Mechanical Properties of Heat Treated 6063 Aluminum Alloy
Recent Patents on Mechanical Engineering, 2010
Aluminum alloy has an extensive range of industrial applications due to its consistent mechanical properties and structural integrity. Aluminum alloy 6063 was given various heat treatment on the solution treatment, artificial aging & natural aging. The study, also outlining recent patents, has been conducted on the mechanical properties upon agehardening treatment to the mentioned alloy. The mechanical properties, namely tensile properties were investigated according to standard procedures. Different heat treatment processes have been applied to reduce the cost of heat treatment of aluminum alloy by optimizing the solution heat treatment process. Two different annealing processes showed that the aluminum alloy did not significantly strengthen. The highest mechanical properties have been achieved by considering the artificial ageing heat treatment process.