Effect of Al content and homogenization on microstructure and damping properties of Mg-Al binary alloys

doi:10.13251/j.issn.0254-6051.2024.07.011

Abstract

Abstract: Effects of Al content (0.25%, 0.5% and 1.0%, mass fraction) and homogenization (420 ℃ for 24 h) on microstructure, mechanical properties and damping properties of as-cast Mg-Al alloys were investigated by using optical microscope, X-ray diffractometer, scanning electron microscope and tensile testing machine. The results show that the addition of Al element reduces the average grain size of the alloy, and the more the addition, the smaller the average grain size, while the average grain size significantly increases after homogenization. The mechanical properties of as-cast Mg-Al alloy gradually increase with the increase of Al content, and the tensile strength, yield strength and elongation of the Mg-1.0%Al alloy are 148.320 MPa, 135.862 MPa, and 8.467%, respectively. After the homogenization, the mechanical properties of Mg-Al alloy decrease due to the increase of average grain size, while the elongation of Mg-0.5%Al and Mg-1.0%Al alloys is increased compared to the as-cast state. The damping properties of the Mg-Al alloys decrease with the increase of Al content, and the critical strain amplitude gradually increases, the damping value Q^-1 for the as-cast Mg-1.0%Al alloy at ε_0.1 is 0.1160, which belongs to the category of highly damped magnesium alloys (Q^-1≥0.01), meanwhile, the damping values of the Mg-Al alloys after homogenization is all higher than that of as-cast state. The damping properties decreases with the increase of Al content for a specific frequency, and decreases with the increase of frequency when the Al content is constant, and the effect of homogenization on the damping properties at high temperatures is not apparent.

Key words: Mg-Al alloy, Al content, homogenization, mechanical properties, damping properties

CLC Number:

TG146.2⁺2

Liu Huashen, Sun Youping, He Jiangmei, Luo Guojian, Pei Mengyu. Effect of Al content and homogenization on microstructure and damping properties of Mg-Al binary alloys[J]. Heat Treatment of Metals, 2024, 49(7): 70-77.

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