Influence of Surface Nanocrystallization and Partial Amorphization Induced by Ultrasonic Shot Peening on Surface Properties of 7075 Aluminum Alloy

Zhu, Lihua; Guan, Yanjin; Wang, Zongshen; Lin, Jianguo; Zhai, Jiqiang; Xie, Zhendong

doi:10.1007/s11665-020-05219-5

Cited by 10 publications

(2 citation statements)

References 37 publications

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“…Through the research on the effect of the shot peening process on the surface integrity of a 7075 aluminum alloy sample, Li et al [55] found that mechanical shot peening could improve the surface microhardness, and its value increased with the increase in shot peening pressure and shot size. Zhu et al [56] investigated the effect of ultrasonic shot peening on the surface microhardness of 7075 aluminum alloy. It was found that with the decrease in shot peening distance, the surface microhardness of 7075 aluminum alloy gradually increased and the average hardening rate increased.…”

Section: Surface Microhardnessmentioning

confidence: 99%

Effects of the Shot Peening Process on Corrosion Resistance of Aluminum Alloy: A Review

et al. 2022

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The high humidity of marine atmosphere and the existence of corrosive chloride ions lead to the premature corrosion failure of aluminum alloy components. The development of surface-strengthening technology provides an opportunity to prolong their service life spans. As a mature surface-strengthening technology, the shot peening process is widely used, owing to its advantages over other strengthening technologies, including its easy operation and high production rate. The shot-peened surface integrity depends on shot peening variables that introduces the thermomechanical effect to the deformed surface layer. When the inappropriate shot peening parameters are adopted, the shot-peened surface integrity could be deteriorated, which further weakens the corrosion performance of the surface. Therefore, it is essential to optimize shot peening process variables with the consideration of the material and its application. In this paper, the strengthening mechanism of the shot peening process was firstly elaborated, and then the effects of process parameters on the surface integrity of aluminum alloy were reviewed. The relationship between the surface integrity and corrosion resistance was also revealed. Two directions, including the application of the surface temperature rise during the shot peening process and the shot-peened surface roughening, are proposed.

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Section: Surface Microhardnessmentioning

confidence: 99%

Effects of the Shot Peening Process on Corrosion Resistance of Aluminum Alloy: A Review

et al. 2022

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“…As an aging heat treatment reinforced aluminum alloy, (Al–Zn–Mg–Cu) 7075 aluminum alloy exhibits high specific strength, good fracture toughness, and excellent low cycle fatigue resistance among other characteristics; it is widely used in the fields of transportation, aerospace, and aviation [ 1 , 2 , 3 , 4 ]. Tungsten inert gas welding, metal inert gas welding [ 5 ], plasma arc welding and laser welding are usually used for this alloy.…”

Section: Introductionmentioning

confidence: 99%

Improving the Properties of Laser-Welded Al–Zn–Mg–Cu Alloy Joints by Aging and Double-Sided Ultrasonic Impact Compound Treatment

Chen¹,

Liu²

2021

Materials

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To improve the loose structure and serious porosity of (Al–Zn–Mg–Cu) 7075 aluminum alloy laser-welded joints, aging treatment, double-sided ultrasonic impact treatment (DSUIT), and a combination of aging and DSUIT (A–DSUIT) were used to treat joints. In this experiment, the mechanism of A–DSUIT on the microstructure and properties of welded joints was analyzed. The microstructure of the welded joints was observed using optical microscopy, scanning electron microscopy, and electron backscatter diffraction (EBSD). The hardness and tensile properties of the welded components under the different processes were examined via Vickers hardness test and a universal tensile testing machine. The results showed that, after the aging treatment, the dendritic structure of the welded joints transformed into an equiaxed crystal structure. Moreover, the residual tensile stress generated in the welding process was weakened, and the hardness and tensile strength were significantly improved. After DSUIT, a plastic deformation layer of a certain thickness was generated from the surface downward, and the residual compressive stress was introduced to a certain depth of the joint. However, the weld zone unaffected by DSUIT still exhibited residual tensile stress. The inner microhardness of the joint surface improved; the impact surface hardness was the largest and gradually decreased inward to the weld zone base metal hardness, with a small improvement in the tensile strength. Compared with the single treatment process, the microstructural and mechanical properties of the welded joint after A–DSUIT were comprehensively improved. The microhardness and tensile strength of the welded joint reached 200 HV and 615 MPa, respectively, for an increase of 45.8% and 61.8%, respectively. Observation of the fractures of the tensile specimens under the different treatment processes showed that the fractures before the aging treatment were mainly ductile fractures while those after were mainly brittle fractures. After DSUIT of the welded joints, a clear and dense plastic deformation layer was observed in the fracture of the tensile specimens and effectively improved the tensile properties of the welded joints. Under the EBSD characterization, the larger the residual compressive stress near the ultrasonic impact surface, the smaller the grain diameter and misorientation angle, and the lower the texture strength. Finally, after A–DSUIT, the hardness and tensile properties improved the most.

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Effect of Surface Mechanical Attrition Treatment on Surface Topography and Dry Sliding Wear Performance of AA7075‐T6

Yarar,

Erturk,

Karabay

2024

Adv Eng Mater

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Surface roughness significantly impacts the service life of materials, particularly in relation to fatigue and wear behavior. This study investigates the effects of surface mechanical attrition treatment (SMAT) on the wear performance and surface topography of AA7075‐T6 aluminum alloy. Experimental investigations are conducted using a specially designed vibration table to apply SMAT at low speeds, varying shot amount, and shot diameter. Surface roughness is measured using a 3D optical profilometer, and wear performance is evaluated through friction coefficient, wear rate, and microstructural analysis via scanning electron microscope. The results highlight several key findings. First, SMAT demonstrates the capability to yield smoother surfaces compared to equivalent processes, enhancing performance and applicability in engineering contexts. Second, SMATed samples exhibit increased surface roughness compared to untreated samples, underscoring the influence of SMAT on surface topography and its potential implications for wear resistance and frictional behavior. The comparative analysis shows that SMAT treatment increases surface roughness from 0.14 μm to a maximum of 0.24 μm. Finally, a notable reduction in friction coefficient, up to 22%, is observed in SMATed AA7075‐T6 samples, indicating the effectiveness of SMAT in improving tribological properties and enhancing component longevity subjected to frictional forces.

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Influence of Surface Nanocrystallization and Partial Amorphization Induced by Ultrasonic Shot Peening on Surface Properties of 7075 Aluminum Alloy

Cited by 10 publications

References 37 publications

Effects of the Shot Peening Process on Corrosion Resistance of Aluminum Alloy: A Review

Effects of the Shot Peening Process on Corrosion Resistance of Aluminum Alloy: A Review

Improving the Properties of Laser-Welded Al–Zn–Mg–Cu Alloy Joints by Aging and Double-Sided Ultrasonic Impact Compound Treatment

Effect of Surface Mechanical Attrition Treatment on Surface Topography and Dry Sliding Wear Performance of AA7075‐T6

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