Annealing Effect on the Microstructure and Mechanical Properties of AA 5182 Aluminum Alloy (original) (raw)
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Annealing Response of Aluminum Alloy AA6014 Processed By Severe Plastic Deformation
In this paper the study of micro structural stability during annealing with respect to time of conventionally grains (CG) and ultrafine-grained (UFG) of Aluminum AA6014 i s carried out. It has been observed that, the effect of the second phase magnesium-silicon particles in the CG and UFG AA6014 samples leads to a rapid hardness which increases from 40HV10 to 70HV10 within 7 days. Artificial aging shows that the material hardness even increased after 20 hours of annealing at 180°C. In total 30 hours of annealing, the hardness arrives at its maximum and then reduces due to the formation of Mg2Si precipitates, which rise in size and change their coherency. The precipitates cannot efficiently pin the dislocations and act as barriers to the dislocation motion which indicate an overall decrease in the hardness. It also has been found that the ultrafine-grained AA6014 alloy loses its thermal stability at approximately 200°C and recrystallized at 300°C. Thermal stability is strongly dependent on the material purity, second phase particles and/or oxide particles which may break up during rolling and lead to some dispersion strengthening.
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.
Archives of materials science and engineering, 2016
Purpose: The main goal of this paper is to present the investigation results of microstructural evolution and mechanical properties changes in commercial EN AW 6060) aluminium alloy after intensive plastic deformation, obtained by equal channel angular pressing (ECAP) techniques in an annealed state. Design/methodology/approach: Annealing heat treatment was used to remove various types of internal stress in a commercially available alloy in order to increase workability of the material. The evolution of its properties and material behaviour was evaluated after 2,4,6,and 8 passes of the ECAP process. Findings: It was found that the mechanical properties and microstructure during intensive plastic deformation, such as that during the ECAP process, were changed. Plastic deformation refined grains in the aluminium alloy and increased its mechanical properties. Research limitations/implications: The presented study shows results of the investigated material in an annealed state. Practica...
This study aims to characterize the microstructure and the evolution of the mechanical behavior after annealing of the AA1070 aluminum alloy cold pressed equal angular channels. The deformation was conducted via route A in five consecutive passes and the accumulated deformation was 5.95. The annealing was carried out at 200 ° C and 250 ° C for 5, 10, 15, 20, 25, 30, 45, 60 minutes. The starting material was derived from a slab of 610 mm thick chopped in multiple passes through hot rolling to final thickness of 32 mm. The microstructure of the material was characterized with the aid of scanning electron microscopy (SEM) in the secondary electron mode. Vickers hardness tests were conducted in order to evaluate the mechanical behavior of the material after pressing and along the heat treatment. The final gran sizes were 1.91µm and 2.07µm ate 200ºC and 250ºC, respectively. The microstructure morphology evolved to near equiaxial. After five consecutive passes of ECAP deformation the average hardness measured was 48.2. The final hardness values after annealing at 200 ° C and 250 ° C were 44.7 Vickers and 40.1Vickers. The reduction at the end of the heat treatment was 7% for the temperature of 200 ° C and 14% for the temperature of 250 ° C. The softening throughout the heat treatment times was due to the activation of the recovery and recrystallization mechanisms that led to changes in the microstructure in order to form a lower energy configuration. The analysis of hardness maps constructed from the data of the mechanical tests allowed concluding that the thermal treatment lead to a development of
Mokslas - Lietuvos ateitis
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.
Materials
A novel continuous process of severe plastic deformation (SPD) named continuous close die forging (CCDF) is presented. The CCDF process combines all favorite advances of multidirectional forging and other SPD methods, and it can be easily scaled up for industrial use. Keeping constant both the cross section and the length of the sample, the new method promotes a refinement of the microstructure. The grain refinement and mechanical properties of commercially pure aluminum (AA1050) were studied as a function of the number of CCDF repetitive passes and the previous conditioning heat treatment. In particular, two different pre-annealing treatments were applied. The first one consisted of a reheating to 623 K (350 °C) for 1 h aimed at eliminating the effect of the deformation applied during the bar extrusion. The second pre-annealing consisted on a reheating to 903 K (630 °C) for 48 h plus cooling down to 573 K (300 °C) at 66 K/h. At this latter temperature, the material remained for 3 h...
Characterization of 5052 Aluminum Alloy under Different Heat Treatments 1
EUROPEAN ACADEMIC RESEARCH, 2020
The use of aluminum alloys has grown considerably over the years, the fact occurs due to the inherent characteristics of the material, such as low density and corrosion resistance in the most varied environments. The present work proposes to characterize the microstructure of the aluminum alloy 5052, which is an aluminum and magnesium alloy that was subjected to different heat treatments. The proposal to study the league is justified by the use of it in sectors such as the naval and with that the analysis of its characteristics can bring possibilities of improvements to its properties, revealing positive and negative points, and improve the performance of the alloy during its applications. As a methodology to achieve the objective, four samples of 5052 aluminum were used, one was subjected to annealing, one to normalization, and two to solubilization (one cooled in water while the other in oil). Afterwards, the samples were embedded, sanded, polished and attacked with hydrochloric acid to visualize its microstructure in an optical microscope. As a result, four samples were obtained with different microstructures, the annealed sample showed a greater amount of α phase (rich in aluminum) and precipitated magnesium in the form of dark spots, the normalized sample presented
Characterization of 5052 Aluminum Alloy under Different Heat Treatments
Zenodo (CERN European Organization for Nuclear Research), 2020
The use of aluminum alloys has grown considerably over the years, the fact occurs due to the inherent characteristics of the material, such as low density and corrosion resistance in the most varied environments. The present work proposes to characterize the microstructure of the aluminum alloy 5052, which is an aluminum and magnesium alloy that was subjected to different heat treatments. The proposal to study the league is justified by the use of it in sectors such as the naval and with that the analysis of its characteristics can bring possibilities of improvements to its properties, revealing positive and negative points, and improve the performance of the alloy during its applications. As a methodology to achieve the objective, four samples of 5052 aluminum were used, one was subjected to annealing, one to normalization, and two to solubilization (one cooled in water while the other in oil). Afterwards, the samples were embedded, sanded, polished and attacked with hydrochloric acid to visualize its microstructure in an optical microscope. As a result, four samples were obtained with different microstructures, the annealed sample showed a greater amount of α phase (rich in aluminum) and precipitated magnesium in the form of dark spots, the normalized sample presented
The effect of solution annealing temperature on the change of microstructural and mechanical properties of EN AW 2024 aluminium alloy was investigated using a metallographic analysis, Vickers hardness measurement and tensile test. An intensive growth of solid solution grains was the result of the increase of solution annealing temperature by the finely dispersed particles dissolved during applied annealing process. The role of these finely dispersed particles was to inhibit the recrystallization process and grain growth of solid solution matrix through its pinning effect on the migrated solid solution grain boundaries. Observed changes of the microstructure involved the strength decline and plasticity enhancement of analysed alloy quenched after solution annealing as well as the hardness decrease of naturally aged alloy.