scholarly journals Texture Evolution and Control of 2524 Aluminum Alloy and Its Effect on Fatigue Crack Propagation Behavior

2021 ◽  
Vol 11 (12) ◽  
pp. 5550
Author(s):  
Yuqiang Chen ◽  
Chuang Xiong ◽  
Wenhui Liu ◽  
Suping Pan ◽  
Yufeng Song ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Cold Rolling ◽  
Texture Evolution ◽  
Cold Deformation ◽  
Solution Treatment ◽  
Second Phase ◽  
Fatigue Crack Growth Resistance ◽  
Volume Fractions

The influences of cold rolling and subsequent heat treatment on the microstructure evolution of 2524 alloy were investigated using an orientation distribution function (ODF) and electron back-scattered diffraction (EBSD). A preparation method of 2524-T3 aluminum alloy with a strong Brass texture was developed, and its effect on the fatigue properties of the alloy was investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that with the increase in cold rolling deformation from 0% to 80%, the volume fractions of Brass, copper, and S textures in the 2524-T3 alloy also increase, especially in the case of Brass and S textures. However, the volume fractions of cube and Goss textures are reduced significantly, especially for cube textures, which are decreased by 57.4%. Reducing coarse second-phase particles (CSPs) is conducive to the formation of a strong deformation texture during cold rolling. A 10% deformation at each rolling pass, followed by a step annealing, helps the preservation of a Brass texture even after solution treatment at 500 °C for 0.5 h, while a large cold deformation followed by high-temperature annealing helps the formation of a strong cube texture. The Brass texture can enhance the strength while decreasing the fatigue crack growth resistance of this alloy.

Microstructures and Properties of Twin-Roll Casting 7050 Aluminum Alloy Strip

2013 ◽  
Vol 652-654 ◽  
pp. 2397-2403 ◽  
Author(s):  
Chun Fu Li ◽  
Hong Bin Wang ◽  
Fan Lei Meng ◽  
Hong Yang Zhao
Keyword(s):  
Electron Microscopy ◽  
Aluminum Alloy ◽  
Solution Treatment ◽  
Second Phase ◽  
Alloy Strip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
7050 Aluminum Alloy ◽  
Second Phase Particles ◽  
Twin Roll

In this study, 7050 aluminum alloy strip was produced using the twin-roll casting technique. Microstructures and properties of the cast-rolling 7050 aluminum alloy were investigated by means of optical microscope (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Vickers hardness test. The results indicate that microstructures of cast-rolling 7050 alloy strip are inhomogeneous on the cross section. From the edge to the center, the size of grain decreases gradually and becomes more homogeneous, showing a transition from dendrite grains to equiaxed grains. There are undissolved second phase particles in grains and at grain boundaries. And the dendrite grains and second phase particles can be reduced by solution treatment, and the hardness of the cast-rolling strip can be improved by aging treatment.

The Effect of Fabrication Process on Microstructure Evolution of N18 Alloy Sheets

2010 ◽  
Author(s):  
Xun Dai ◽  
Hong Liu ◽  
Hongman Jiang ◽  
Ying Wang
Keyword(s):  
Cold Rolling ◽  
Hot Rolling ◽  
Texture Evolution ◽  
Cold Deformation ◽  
Rolling Plane ◽  
Second Phase ◽  
Rolling Pass ◽  
Before And After ◽  
Basal Pole ◽  
Volume Decrease

The microstructure and texture evolution of N18 sheets are studied after a series of fabrication processes which contain hot rolling at 780°C, cold rolling with the total deformation of 10% and recrystallized annealing at 580°C for 1.5h. The results show that grain size and the density of low angle grain boundaries of the fabricated sheets increase with the increase of hot rolling pass, and there is a little difference of grains for cold rolling and recrystallized sheets that deformed grain could be observed on both of them, which indicates that dynamic recrystallization occurs during hot rolling, but the cold deformation was so limited that the sheets could not be fully recrystallized because of lack of recrystallization driving force. Second phase precipitated particles (SPPs) in as-received N18 sheets are smaller than that in the fabricated sheets. It may because that part of SPPs are dissolved during hot rolling which lead to the volume decrease and supersaturation elements separate out to form SPPs again or primary SPPs grow up during recrystallization which lead to volume extending. The N18 sheets mainly have (0001) texture before and after fabrication and the density of basal pole which was along normal orientation on rolling plane increases as rolling pass increasing but decreases after cold rolling and increase again after recrystallization. After fabrication, the value of fND increases for N18 sheets, but there were a little difference among different rolling pass. EBSD analysis shows that the grains of rolling sheets mainly display orientations with <10 1¯ 0>//RD and {0001} <10 1¯ 0> texture was stronger, and the grains of recrystallized sheets mainly display orientations with <11 2¯ 0>//RD made {0001} <11 2¯ 0> texture increasing.

Research on the Second Phase of Spray Forming Al-8.5Fe-1.3V-1.7Si Aluminum Alloy

2014 ◽  
Vol 886 ◽  
pp. 36-40
Author(s):  
Rong Hua Zhang ◽  
Bao Hong Zhu ◽  
Xiao Ping Zheng
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transmission Electron Microscopy ◽  
Aluminum Alloy ◽  
Room Temperature ◽  
Spray Forming ◽  
Heating Process ◽  
Second Phase ◽  
Transmission Electron ◽  
Second Phases

Heat-resistant Al-8.5Fe-1.3V-1.7Si aluminum alloys were prepared by spray forming technique. The phase transition of deposited alloys from room temperature to 500°C was measured by Differential Scanning Calorimeter. The organization and the second phases of the alloys were observed and studied by transmission electron microscopy. The research results show that No endothermic peak appears in the deposited alloys during heating process, there is no phase transition occur in the alloy during the heating process from room temperature to 500°C. The deposited alloys mainly include α-Al and α-Al12(Fe,V)3Si phase. Under the transmission electron microscopy, there are also a small amount of slug, fan-shaped, needle-like, block, strip second phases, these phases are Al12Fe3Si, Al8Fe2Si, θ-Al13Fe4, Al9FeSi3, Al6Fe.

Effects of Thermomechanical Treatment Process on the Microstructure and Properties of 7A04 Aluminum Alloy

2011 ◽  
Vol 335-336 ◽  
pp. 805-808 ◽  
Author(s):  
Shi Xing Zhang ◽  
Hai Hong Wu ◽  
Gang Yi Cai
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Thermomechanical Treatment ◽  
Ageing Time ◽  
Solution Treatment ◽  
Second Phase ◽  
Microstructure And Properties ◽  
Treatment Processes ◽  
Phase Precipitate ◽  
Peak Value

The mechanical properties of a 7A04 aluminum alloy were improved by deformation strengthening and phase transformations strengthening adopting thermomechanical treatment, whose process include solution treatment, deformation treatment and ageing treatment in turn. The paper focuses on the influences of deforming degree and ageing process on microstructure and properties of 7A04 aluminum alloy. The experimental results show that hardness increased with increasing deformation ratio, and the value are greatly higher than that of samples after solution treatment. The results of ageing after deformation show that the hardness enhanced with prolonging the ageing time, which reach the peak value at 16 hours. In addition, the microstructure became more homogeneous and the grain was refined obviously by metallography microscope observation. The second phase precipitate dispersedly to strengthen the alloy. Above all, in order to obtain the better mechanical properties, the optimal thermomechanical treatment processes are solution treatment at 470°C for 2h, deformation with ratio of 40% as well as ageing at 120°C for 16h.

Effects of Thermomechanical Treatment Process on the Microstructure and Properties of Al-Zn-Mg Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 847-850
Author(s):  
Gang Yi Cai ◽  
Yu Yong Yang ◽  
Xiao Hua Li
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Thermomechanical Treatment ◽  
Ageing Time ◽  
Solution Treatment ◽  
Second Phase ◽  
Microstructure And Properties ◽  
Treatment Processes ◽  
Phase Precipitate ◽  
Peak Value

The mechanical properties of Al-Zn-Mg aluminum alloy were improved by deformation strengthening and transformations strengthening adopting thermomechanical treatment, whose process are solution treatment, preageing treatment, deformation treatment and ageing treatment in turn. The paper focuses on the influences of deforming degree and ageing process on microstructure and properties of Al-Zn-Mg aluminum alloy. The experimental results show that hardness increased with increasing deformation ratio, and the value are greatly higher than that of samples after solution treatment. The results of ageing after deformation show that the hardness enhanced with prolonging the ageing time, which reach the peak value at 16 hours. In addition, the microstructure became more homogeneous and the grain was refined obviously by metallography microscope observation. The second phase precipitate dispersedly to strengthen the alloy. Above all, in order to obtain the better mechanical properties, the optimal thermomechanical treatment processes are solution treatment at 470°C for 2h, preageing treatment at 140°C for 24h, deformation with ratio of 40% as well as ageing at 120°C for 16h.

Effect of Extrusion Temperature on Microstructure and Mechanical Properties of 7A36 Aluminum Alloy

2020 ◽  
Vol 993 ◽  
pp. 108-115
Author(s):  
Ze Yu Zhou ◽  
Xiang Xiao ◽  
Kang Du ◽  
Cheng Liu ◽  
Dan Lv ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Aluminum Alloy ◽  
Dynamic Recrystallization ◽  
Deformation Texture ◽  
Extrusion Temperature ◽  
Second Phase ◽  
Final State ◽  
Electron Back Scattered Diffraction ◽  
Scanning Electron

The microstructure, texture distribution, tensile property and fracture toughness of 7A36 aluminum alloy profile were investigated by optical microscopy (OM), scanning electron microscopy (SEM), electron back scattered diffraction (EBSD), tensile and toughness tests, respectively. The results show that when extrusion temperature increased from 410 °C to 430 °C, the second phase grew and the intensity of aging state alloy increased. With the extrusion temperature increased, the fracture toughness and elongation increased firstly and the decreased. The fracture toughness KICcan reach to 46.47 MPa·m1/2 at 420 °C. The extruded and final state of the 7A36 profile was dominated by the textured texture (Brass, S, and Copper), accompanied by a small amount of recrystallized type texture (Cube and Goss). As the extrusion temperature increased, the hard deformation texture increased, resulting in an increase in strength. The increase of extrusion temperature led to the increase of dynamic recrystallization fraction. The dynamic recrystallization fraction of the extruded state was 2.26 % when extrusion temperature was 430 °C. The change in KIC performance is the combined result of re-crystallization, second phase and texture.

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.

Effect of Processing Techniques on the Mechanical Property of New Zirconium Alloy Strip

2019 ◽  
Vol 944 ◽  
pp. 99-103
Author(s):  
Peng Fei Zhang ◽  
Xu Kun Hu ◽  
Guo Cheng Sun ◽  
Bo Gao ◽  
Bin Xu
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Cold Rolling ◽  
Zirconium Alloy ◽  
Cold Deformation ◽  
Second Phase ◽  
Alloy Strip ◽  
Deformation Degree ◽  
Deformation Amount ◽  
Cold Rolling And Annealing

In this paper, a typical new zirconium alloy (Zr-Sn-Nb system) was used as the research object. The zirconium alloy strip was prepared from a series of production processes from smelting. By optimizing the process of cold processing with the change of the deformation amount and the intermediate heat treatment, the mechanical properties of the zirconium alloy were studied by different processing. The results are as follows: (1) The mechanical properties of the new zirconium alloy have reached the mechanical properties of Zirlo alloy with the optimization of the alloy composition, and (2) The zirconium alloy can refine the grain strength by the control of deformation degree and annealing temperature during cold deformation. The larger of the cold deformation, the smaller the average of the grains and the higher the yield strength of the material. The yield strength of the material was decreased by cold rolling and annealing more than once; (3) The larger the cold rolling variable of the zirconium alloy in cold deformation, it is beneficial to the second phase to be fine, dispersed and uniformly distributed, thus improving the strength of the material.

Effect of Cold Deformation on Precipitation of 7050 Aluminum Alloy during Aging Process

2015 ◽  
Vol 1120-1121 ◽  
pp. 1014-1018
Author(s):  
Hong Wei Yan ◽  
Liang Zhen ◽  
Jian Tang Jiang
Keyword(s):  
Electron Microscopy ◽  
Aluminum Alloy ◽  
Aging Process ◽  
Cold Deformation ◽  
Research Topic ◽  
Strengthening Mechanisms ◽  
Scanning Calorimetry ◽  
Main Research ◽  
Transmission Electron ◽  
7050 Aluminum Alloy

Strengthening of aluminum alloy has always been an interesting research topic. There might be interactions between different strengthening mechanisms. In this paper, the effect of large cold deformation on the precipitation of as-quenched 7050 aluminum alloy was studied. Differential scanning calorimetry was used as the main research technique, accompanied by tensile test and transmission electron microscopy. It was found that clusters and precipitation had formed in the cold deformation, and dislocations accelerated the precipitation dynamics.

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