scholarly journals Effects of Deformation Parameters on Microstructural Evolution of 2219 Aluminum Alloy during Intermediate Thermo-Mechanical Treatment Process

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1496 ◽  
Author(s):  
Lei Liu ◽  
Yunxin Wu ◽  
Hai Gong
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Mechanical Treatment ◽  
Treatment Process ◽  
Solution Treatment ◽  
Deformation Parameters ◽  
Solid Solution Treatment ◽  
2219 Aluminum Alloy ◽  
Thermo Mechanical Treatment ◽  
Storage Energy

To explore the effective way of grain refinement for 2219 aluminum alloy, the approach of ‘thermal compression tests + solid solution treatment experiments’ was applied to simulate the process of intermediate thermo-mechanical treatment. The effects of deformation parameters (i.e., temperature, strain, and strain rate) on microstructural evolution were also studied. The results show that the main softening mechanism of 2219 aluminum alloy during warm deformation process is dynamic recovery, during which the distribution of CuAl2 phase changes and the substructure content increases. Moreover, the storage energy is found to be decreased with the increase in temperature and/or the decrease in strain rate. In addition, complete static recrystallization occurs and substructures almost disappear during the solid solution treatment process. The average grain size obtained decreases with the decrease in deforming temperature, the increase in strain rate, and/or the increase in strain. The grain refinement mechanism is related to the amount of storage energy and the distribution of precipitated particles in the whole process of intermediate thermal-mechanical treatment. The previously existing dispersed fine precipitates are all redissolved into the matrix, however, the remaining precipitates exist mainly by the form of polymerization.

scholarly journals Thermo-mechanical treatment regulation of microstructure and comprehensive performance in Al-Zn-Mg-Cu alloy

2020 ◽  
Vol 326 ◽  
pp. 05004
Author(s):  
Zhiguo Chen ◽  
Chenghua Lu ◽  
Jing Peng ◽  
Zhengui Yuan
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Anodic Dissolution ◽  
Intergranular Corrosion ◽  
Mechanical Treatment ◽  
Cu Alloy ◽  
Comprehensive Performance ◽  
Thermo Mechanical Treatment ◽  
Strength And Ductility ◽  
Intergranular Corrosion Resistance

The comprehensive performance of Al-Zn-Mg-Cu alloy can be significantly improved by a proposed novel thermo-mechanical treatment (NTMT). The influence of the NTMT on the properties and microstructure was investigated by tensile test, corrosion resistance test, X-ray diffraction (XRD), and transmission electron microscopy (TEM). Results show that Al-Zn-Mg-Cu alloy treated by the NTMT can obtain an excellent combination of strength and ductility. The highest yield strength and ultimate tensile strength reached 643 MPa and 664 MPa respectively, and the elongation was 9.7%. Meanwhile, electrochemical corrosion resistance and intergranular corrosion resistance in the aluminum alloy can be improved after the NTMT. The mechanism of the excellent combination of strength and ductility is thought to be the synergistic effect of dislocations substructures, texture configuration, and nanoprecipitates. The improvement of intergranular corrosion resistance of the aluminum alloy is caused by changes in the micro-morphology of grain boundary precipitates after the NTMT, which can block anodic dissolution channels along grain boundaries to reduce the rate of anodic dissolution and avoid hydrogen embrittlement.

scholarly journals Grain Coarsening and Texture Evolution of Pre-Stretched 2219 Aluminum Alloy Sheets during Subsequent Solution Treatment

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 530 ◽  
Author(s):  
Lihui An ◽  
Jiguang Li ◽  
Shijian Yuan
Keyword(s):  
Aluminum Alloy ◽  
Grain Growth ◽  
Texture Evolution ◽  
Solution Treatment ◽  
Optical Microscope ◽  
Stretch Forming ◽  
Forming Process ◽  
Deformation Degree ◽  
Grain Structures ◽  
2219 Aluminum Alloy

During the two-pass stretch forming process for manufacturing of thin-walled aluminum alloy sheet components, abnormal grain growth may happen if an improper pre-deformation degree was conducted before solution heat treatment, which is negative to the performance and surface quality of the final components. In order to overcome this problem, the effect of pre-stretching deformation was investigated on the change of grain structures of 2219 aluminum alloy sheets. The 2219 aluminum alloy sheets were pre-stretched with various deformation degrees, and then were heated to 540 °C for about 50 min for solution treatment. The grain structures before and after solution treatment were characterized using an optical microscope (OM) and electron back scattering diffraction (EBSD). Results show that the grains grew up gradually during the solution treatment with an increase of pre-stretching. The critical pre-stretching degree is about 3%. Once the pre-deformation exceeds 3%, the grain growth is significant, especially when it reaches 5%. Moreover, the pre-stretching has little influence on the orientation distribution. Some near a copper texture {112}<111> were generated as the pre-stretching degree was increased to 5%. All the results suggest that the pre-stretching before solution treatment cannot be larger than 3% in the two-pass stretch forming of a 2219 aluminum sheet.

Effects of Precipitated Particles on Microstructure Evolution during Thermo-Mechanical Processing of Al-Zn-Mg-Cu Alloy

2016 ◽  
Vol 879 ◽  
pp. 318-323
Author(s):  
Hui Qin Chen ◽  
Kun Zhang ◽  
Xiao Dong Zhao
Keyword(s):  
Solid Solution ◽  
Microstructure Evolution ◽  
Hot Deformation ◽  
Mechanical Treatment ◽  
Solution Treatment ◽  
Mechanical Processing ◽  
Final Solution ◽  
Multi Scale ◽  
Cu Alloy ◽  
Solid Solution Treatment

Two intermediate thermal mechanical treatment (ITMT) Processes were designed for investigation the influence of multi-scale precipitated particles on microstructure evolution during thermo-mechanical processing of Al-7.6Zn-1.5Mg-1.75Cu-0.12Zr alloy by hot compressive experiments and microstructure testing of OM and EBSD. It is found that the size and distribution of precipitated particles preprocessed by over-aging at 400°C for14h can meet the particle stimulated nucleation of recrystallization. Refined and uniform grains present in the sample after hot deformation at about 20 of LnZ up to 80% reduction and subsequent final solid solution treatment. But for samples preprocessed by solid solution at 435°C for 2h and aging at 200°C for 12h, Refined uniform recrystallized grains or recovery sub-grains in elongated grains present in the samples after hot deformation at about 25 of LnZ up to 60% reduction followed by annealing at 350°C for 0.5h and final solution treatment.

Effects of Solution Treatment on the Microstructure and Properties of 7003 Aluminum Alloy

2010 ◽  
Vol 123-125 ◽  
pp. 1219-1222
Author(s):  
Xiao Ming Chen ◽  
Ren Guo Song
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Aluminum Alloy ◽  
Solution Treatment ◽  
Solution Temperature ◽  
X Ray ◽  
Microstructure And Properties ◽  
Solid Solution Treatment ◽  
Before And After ◽  
Scanning Electron

The microstructure and properties of 7003 aluminum alloy before and after aging under various solid solution treatment parameters have been studied by electronic tensile machine, scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS). It’s showed that the strength decreased while the ductility increased with raising the solid solution temperature before aging; the strength decreased and then increased while the ductility increased and then decreased with increasing the solid solution time. The strength of 7003 aluminum alloy after aging were evidently higher than those before aging, and the samples solutioned at 743 K for 70 min were of the best mechanical properties with YS=286 MPa, UTS=345 MPa, E=15.5%, which are higher than those of the original alloy by 2.1%, 1.5% and 29.1% respectively. Hence 743 K/70 min is one of the best solid solution regimes.

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