scholarly journals Influence of Retrogression and Reaging Treatment on Microstructure and Microhardness of the 3A21/7075 Aluminum Alloy Cladding Material

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ming Hu ◽  
Xiaoxue Ren ◽  
Jianbo Sun ◽  
Yunlong Zhang
Keyword(s):  
Aluminum Alloy ◽  
Energy Dispersive Spectrometer ◽  
Engineering Application ◽  
Hardness Test ◽  
7075 Aluminum Alloy ◽  
Electron Backscattered Diffraction ◽  
Compound Casting ◽  
Retrogression And Reaging ◽  
The Impact ◽  
Cladding Material

The 7075 aluminum alloy was an important structural material in the field of aeronautics and astronautics. With the development of this field, the requirements for its comprehensive properties were increasing. A novel casting method, the impact jet solid-liquid compound casting, was adopted to fabricate the 3A21/7075 aluminum alloy cladding material. Retrogression and reaging (RRA) treatment was further applied to the 3A21/7075 aluminum alloy cladding material in order to investigate the influence of RRA on microstructure and microhardness of the 3A21/7075 aluminum alloy cladding material. Then, the electron backscattered diffraction (EBSD) technique and the transmission electron microscope (TEM) together with the energy dispersive spectrometer (EDS) and the hardness test were utilized to analyze the influence of RRA treatment on microstructure and hardness of the 3A21/7075 aluminum alloy cladding material. The research results showed the 3A21/7075 aluminum alloy cladding material had better deformability. The amount of fine and dispersed phases precipitated in grains was in favor of improving the comprehensive mechanical properties of the 3A21/7075 aluminum alloy cladding material. This research might provide data and a theoretical approach for the engineering application of the 3A21/7075 aluminum alloy cladding material.

scholarly journals Fabrication and microstructural analysis of 3A21/7075 aluminum alloy cladding material based on impact jet solid–liquid compound casting

2021 ◽  
Vol 30 ◽  
pp. 2633366X2093448
Author(s):  
Hu Ming ◽  
Ren Xiaoxue ◽  
Sun Jianbo ◽  
Zhang Yunlong ◽  
Teng Chunfeng ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Energy Dispersive Spectrometer ◽  
Microstructural Analysis ◽  
7075 Aluminum Alloy ◽  
Cladding Layer ◽  
Compound Casting ◽  
Depth Analysis ◽  
Solid Liquid ◽  
Impact Jet ◽  
Cladding Material

To solve thickness problem for high-strength aluminum alloy used as plastic mold materials and eliminate oxide film on the surface of aluminum alloy, a new compound casting, namely impact jet solid–liquid compound casting, was developed to fabricate 3A21/7075 aluminum alloy cladding material. Then, optical microscope (OM), electron-backscattered diffraction (EBSD) technique, and transmission electron microscope (TEM) together with energy-dispersive spectrometer (EDS) were used to analyze microstructure of 3A21/7075 aluminum alloy cladding material. The OM and EBSD results showed that the 3A21/7075 aluminum alloy cladding material was composed of 3A21 cladding layer, fusion zone (FZ), heat-affected zone, and 7075 matrix. The grain morphology on both sides of FZ had great differences. Moreover, the TEM and EDS results showed that the 3A21 cladding layer showed a bulk phase and lots of fine and dispersed granular phases, while the 7075 matrix appeared undetermined strip phases and amounts of fine and dispersed rod-like phases. Moreover, FZ existed a great deal of fine and dispersed granular phases and rod-like phases. The 3A21/7075 aluminum alloy cladding material could effectively solve the problems mentioned above and the in-depth analysis of microstructures of 3A21/7075 aluminum alloy cladding material was of great importance in terms of engineering value and academic significance.

Influence of Laser Shot Peening Parameters on the Surface Hardness and Roughness of 7075 Aluminum Alloy

2018 ◽  
Vol 920 ◽  
pp. 83-88
Author(s):  
Jun Hao Zhang ◽  
Xiu Quan Cheng ◽  
Qin Xiang Xia ◽  
Jia Yu Li
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Shot Peening ◽  
Surface Hardness ◽  
Laser Shot ◽  
7075 Aluminum Alloy ◽  
Alloy Specimen ◽  
Structural Parts ◽  
The Impact ◽  
Overlap Rate

The laser shot peening has the widely application prospect in aircraft structural parts repairment. The influence of laser shot peening parameters on the surface hardness and surface roughness has guiding significance for laser shot peening process. The variation law of surface hardness and surface roughness in the peening area of 7075 aluminum alloy were obtained based on the experiment research. The results show that the surface hardness improves effectively after laser shot peening, and the maximum hardness is 205.4HV, which is improved by 19.49% compared with the original hardness. Besides, the surface roughness of the rough specimen decreases; whereas, those of the smooth specimen increases after laser shot peening. However, both the surface hardness and surface roughness tend to be saturated when the impact times exceeds 3 times or the overlap rate exceeds 50%. Therefore, a good repairment effect can be obtained with 3 impact times and 50% overlap rate for the 7075 aluminum alloy specimen.

The Effect of Two-Step Aging on the Electrical Properties of 7075 Aluminum Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 3075-3078
Author(s):  
Jian Hua Zhong ◽  
Yin Ping Xiao ◽  
Hong Bin Zhu ◽  
Kai Feng
Keyword(s):  
Aluminum Alloy ◽  
Electrical Properties ◽  
Aging Process ◽  
Aging Treatment ◽  
Cast Aluminum Alloy ◽  
7075 Aluminum Alloy ◽  
Cast Aluminum ◽  
Casting Condition ◽  
The Impact

This experiment has taken a research on the conductivity changes of 7075 aluminum alloy after being extruded and two-step aging treatment,and has done a analysis on the theory and rules of the impact on conductivity performance under the two-step aging treatment.Compared to cast aluminum alloy and extruded aluminum alloy without two-step aging process,the experiment showed that extruded alloy with two-step aging treatment has the highest conductivity about 44% IACS, 33.3% more than under casting condition and 22.2% more than only being extruded.

Characterizations of Electrospark Deposition TA2 Alloy Coating on 7075 Aluminum Alloy Surface

2013 ◽  
Vol 821-822 ◽  
pp. 873-876
Author(s):  
Ming Wei Wang ◽  
Wen Xin ◽  
Xiu Jun Zhao ◽  
Qin Yi Ma ◽  
Shu Li
Keyword(s):  
Aluminum Alloy ◽  
Electrode Materials ◽  
Hardness Test ◽  
Alloy Coating ◽  
7075 Aluminum Alloy ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Electrospark Deposition ◽  
Gradient Distribution ◽  
Electrical Pulses

Electro-spark deposition (ESD) is a microwelding process that utilizes short duration of electrical pulses to deposit electrode materials to a metallic substrate. In this paper, taking TA2 bar as electrode, a deposition layer of thickness up to 40μm was built up to on 7075 aluminum alloy substrate by means of ESD. The deposition layer is metallurgical bonded to the substrate. The microstructure, phase composition, and micro-hardness of TA2 coating were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness test. The microstructure of the coating was mainly composed of TiN phase, Al3Ti phase, AlN phase and Al phase. Its micro-hardness reached 295 HV0.05, about 2 times as high as that of the substrate. The hardness at the cross-section of the entire deposition layer showed a gradient distribution.

Effect of ultrasonic melt treatment on the tribological behavior of 7075 aluminum alloy

2020 ◽  
Vol 62 (12) ◽  
pp. 1243-1250
Author(s):  
Fahri Vatansever ◽  
Alpay Tamer Erturk ◽  
Erol Feyzullahoglu
Keyword(s):  
Aluminum Alloy ◽  
Tribological Behavior ◽  
7075 Aluminum Alloy ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment

scholarly journals Effects of equal channel angular pressing and heat treatments on the microstructures and mechanical properties of selective laser melted and cast AlSi10Mg alloys

2021 ◽  
Vol 21 (3) ◽  
Author(s):  
Przemysław Snopiński ◽  
Mariusz Król ◽  
Marek Pagáč ◽  
Jana Petrů ◽  
Jiří Hajnyš ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Equal Channel Angular Pressing ◽  
Heat Treatments ◽  
Electron Backscattered Diffraction ◽  
Angular Pressing ◽  
Low Temperature Annealing ◽  
Transmission Electron ◽  
Before And After ◽  
The Impact

AbstractThis study investigated the impact of the equal channel angular pressing (ECAP) combined with heat treatments on the microstructure and mechanical properties of AlSi10Mg alloys fabricated via selective laser melting (SLM) and gravity casting. Special attention was directed towards determining the effect of post-fabrication heat treatments on the microstructural evolution of AlSi10Mg alloy fabricated using two different routes. Three initial alloy conditions were considered prior to ECAP deformation: (1) as-cast in solution treated (T4) condition, (2) SLM in T4 condition, (3) SLM subjected to low-temperature annealing. Light microscopy, transmission electron microscopy, X-ray diffraction line broadening analysis, and electron backscattered diffraction analysis were used to characterize the microstructures before and after ECAP. The results indicated that SLM followed by low-temperature annealing led to superior mechanical properties, relative to the two other conditions. Microscopic analyses revealed that the partial-cellular structure contributed to strong work hardening. This behavior enhanced the material’s strength because of the enhanced accumulation of geometrically necessary dislocations during ECAP deformation.

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