Effect of Ultrasonic Vibration on Grain Size and Precipitated Phase Distribution of 6061 Aluminum Alloy Welded Joint

Sui, Chufan; Zhengjun, Liu; Ai, Xingyu; Liu, Changjun; Zou, Zongxuan

doi:10.3390/cryst12020240

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…The size of α-Cu matrix gradually decreases with the application of mechanical vibration. In addition, since the mechanical vibration promotes heterogeneous nucleation below the liquidus temperature [22,23], the amount of δ phase significantly increases and distributes more evenly as shown in Figure 2(f–i). Meanwhile, the vibrational field intensifies the flow of the melt, resulting in a more uniform distribution of the initial nuclei.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterisation of tin bronze/steel composites by solid–liquid bonding with vibration

Dong

Peng

Sun

et al. 2023

Materials Science and Technology

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In the present study, mechanical vibration was applied in the preparation of the tin bronze/steel bimetal composite by the solid–liquid bonding, and the effects on the microstructure and mechanical properties were investigated. The results show that mechanical vibration refines the microstructure of tin bronze and accelerates the interdiffusion between the two components, resulting in the improvement of the bonding strength and Brinell hardness. With the vibration frequency of 30 Hz, the composite strength and hardness are significantly improved. The finite element method further shows that the exciting force and homogeneous temperature field caused by the vibration are the main reasons for the microstructure optimisation. HIGHLIGHTS The tin bronze/1010 steel bimetallic layered composites with homogeneous microstructure are prepared by solid–liquid bonding under the mechanical vibration field. The interface thickness can be increased by applying mechanical vibration to the solid–liquid bonding process of the bimetals. Combined with the results of finite element simulation, the effect mechanism of the mechanical vibration in the preparation process was discussed. With the application of mechanical vibration, the hardness and interfacial bonding strength of the bimetals are obviously improved, and there is an optimal vibration parameter.

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Section: Resultsmentioning

confidence: 99%

Preparation and characterisation of tin bronze/steel composites by solid–liquid bonding with vibration

Dong

Peng

Sun

et al. 2023

Materials Science and Technology

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“…The first of these is that the bubbles collapse and generate shock waves under the action of sound pressure exceeding a critical threshold. These shock waves break the crystallized and grown grains and cause the grains to become finer [107]. The second theory is explained by the local melting point increase resulting from the high-pressure shock wave caused by cavitations.…”

Section: Ultrasonic Treatmentmentioning

confidence: 99%

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

Yolcu,

Kahraman

2023

Mater. Res. Express

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Joining aluminum alloys with arc welding methods is frequently subject to literature and industrial applications. Although aluminum alloys have different difficulties in the arc welded process, the formation and elimination of solidification cracking defects is a more complex phenomenon. Since avoidance of this defect requires specific approaches and methods, special attempts and improvements have been studied frequently on this subject in recent years. Studies in the literature have clearly shown that this defect, which is often encountered in aluminum alloys, takes place along the grain boundaries. Therefore, the major approach to eliminate this defect is activating nucleation and decreasing the grain size. In this context, modification approaches in the literature, which are frequently used for arc welding of aluminum alloys, have been developed to use three different mechanisms including heterogeneous nucleation, dendrite fragmentation, and grain detachment. While it is aimed to increase heterogeneous nucleation by reinforcing filler metals with compounds in the inoculation approach; dendrite fragmentation and grain detachment are also aimed in the approaches where external effects and forces are used. Within the frame of references, it is also possible to review the external factors aiming to improve weld pool convection and thermal conditions under two headings, which are weld pool stirring and pulsed arc current approaches. The weld pool stirring approach also includes ultrasonic treatment and magnetic arc oscillation methods. In this study, solidification cracking defect that frequently occurs in the arc welding of aluminum alloys is explained fundamentally and the attempts to eliminate this defect are presented as a review paper in a comprehensive manner.

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“…The well-known industrial light metal aluminum alloy, which has the advantages of low density, high specific strength, ease of processing, and excellent corrosion resistance, is extensively employed in ships, automobiles, aerospace, and hydraulic machinery. [1][2][3] In these hydraulic systems, cavitation occurs due to local pressure fluctuations that induce bubbles to form in the fluid. The growth and collapse of cavitation bubbles can cause surface erosion and material loss 4 due to shock waves 5,6 or microjets, 7,8 which restricts engineering applications of aluminum alloy material.…”

Section: Introductionmentioning

confidence: 99%

A study on surface microgrooves in cavitation test of 6061 aluminum alloy

Wang

Cheng

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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Microgrooves of different widths and microgrooves structures with varying widths were engraved on the surface of 6061 aluminum alloy using fiber laser marking equipment. In order to investigate the influence of the width of microgrooves on its cavitation behavior, cavitation tests on the microgroove structure were performed using an ultrasonic vibration apparatus. The hardness, the surface roughness, and the microscopic morphology of the samples were examined with a digital microhardness tester, a digital three-dimensional video microscope, and a scanning electron microscope, respectively. The results demonstrated that, increasing microgroove size was conducive to inhibition of cavitation erosion while decreasing microgroove size had an opposite effect. The surface microgrooves group elongated the incubation period of aluminum alloy in the cavitation tests, and noticeably increased the cavitation resistance of the aluminum alloy. It was also concluded that, the microgrooves group could transform microjets aiming at the alloy surface to the inside of microgrooves, and absorbed the impacted energy from microjets, leading to a remarkable anticavitation effect.

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Effect of Ultrasonic Vibration on Grain Size and Precipitated Phase Distribution of 6061 Aluminum Alloy Welded Joint

Cited by 8 publications

References 34 publications

Preparation and characterisation of tin bronze/steel composites by solid–liquid bonding with vibration

Preparation and characterisation of tin bronze/steel composites by solid–liquid bonding with vibration

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

A study on surface microgrooves in cavitation test of 6061 aluminum alloy

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