Effect of Ultrasonic Vibration Assistance on the Tensile Properties and Microstructure of 6061 Aluminium Alloy

LYU Yuan; PAN Xixiang; YI Cong; YANG Pingchuan; LIN Xinyi; LI Xin; WANG Yan; WANG Yifan

doi:10.3969/j.issn.1674-6457.2025.06.015

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 143-149. DOI: 10.3969/j.issn.1674-6457.2025.06.015

Light Alloy Forming

Effect of Ultrasonic Vibration Assistance on the Tensile Properties and Microstructure of 6061 Aluminium Alloy

LYU Yuan¹, PAN Xixiang¹, YI Cong¹, YANG Pingchuan², LIN Xinyi², LI Xin², WANG Yan¹, WANG Yifan¹

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Abstract

The work aims to study the changes in tensile properties and microstructure of 6061 aluminium alloy materials under ultrasonic vibration assisted conditions with different amplitudes. Ultrasonic-assisted tensile tests were carried out under different ultrasonic amplitude conditions and different tensile rates respectively. The hardness of the tensile specimens was measured by the microhardness tester. The scanning electron microscope was used to observe and analyze the fracture morphology. The metallographic microscope was used to observe the changes in the microstructure of the material under the effect of ultrasonic vibration. The microhardness of the tensile specimens increased significantly with the application of ultrasonic vibration, and the increase in the microhardness was proportional to the ultrasonic amplitude and the duration of vibration application. The size of the ligamentous nests and the number of ligamentous nests in the fracture of the specimens increased significantly. The number of large-sized grains decreased significantly and the number of fine grains increased continuously. There was a significant decrease in the flow stress during stretching, with the yield strength decreasing from 285.01 MPa to 264.51 MPa, the tensile strength decreasing from 355.71 MPa to 336.09 MPa, and the change in elongation being small. The ultrasonic vibration has a hardening effect in the auxiliary tensile process, and the main factors affecting the hardening effect are the amplitude size of ultrasonic vibration and the duration ultrasonic action. The reason for the ultrasonic hardening effect is that the number of small-sized grains of the material is significantly increased by ultrasound, which results in the strengthening effect of fine grains leading to the enhancement of the mechanical properties.

Key words

6061 aluminum alloy / tensile properties / ultrasonic vibration / microstructure / acoustic softening effect

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LYU Yuan, PAN Xixiang, YI Cong, YANG Pingchuan, LIN Xinyi, LI Xin, WANG Yan, WANG Yifan. Effect of Ultrasonic Vibration Assistance on the Tensile Properties and Microstructure of 6061 Aluminium Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 143-149 https://doi.org/10.3969/j.issn.1674-6457.2025.06.015

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