METALS AND METAL MATRIX COMPOSITES |
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Effect of Homogenization Treatment on Microstructure and Properties of 2A12 Aluminum Alloy |
HE Cuiyun, MO Wenfeng, LUO Binghui, BAI Zhenhai, ZHANG Xin
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School of Materials Science and Engineering, Central South University, Changsha 410083,China |
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Abstract In order to obtain excellent mechanical properties and improve the quality of milling surface, the effect of homogenization of 2A12 aluminum alloy on microstructure evolution, precipitation behavior, chemical milling surface quality and mechanical properties were investigated by using diffe-rential scanning calorimetry (DSC), scanning electron microscope(SEM),transmission electron microscope(TEM), tensile, surface roughness measurement. The results show that the non-equilibrium constituent existing in the alloy ingot is the S phase, the θ phase and the high melting point AlCuFeMn phase, and the residual second phase on the grain boundary affects the quality of the alloyed milling surface. After the alloy was homogenized by 495 ℃/12 h+505 ℃/18 h, a large amount of non-equilibrium constituent was dissolved back into the matrix. In the T6 alloy, the S phase was densely distributed in the form of a sheet, and the T phase was distributed in a rod shape. The best homogenization was 495 ℃/12 h+505 ℃/18 h, the milling surface roughness was (1.18±0.06) μm, and the tensile strength, yield strength and elongation were (469±3.5)MPa,(396±4.8)MPa and (11.8±0.1)%, respectively.
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Published: 29 May 2020
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Fund:The work was financially supported by Military Industry Cooperative Project (JPPT-Y2017-3). |
About author:: Cuiyun He is a postgraduate student. She is studying at the School of Materials Science and Engineering, Central South University. She is focusing on the microstructure and properties of 2A12 aluminum alloy. Binghui Luo, professor of Central South University,doctoral supervisor, member of the Committee of Solid Internal Consumption and Mechanical Spectrum of the Chinese Physical Society. He has presided more than 20 scientific research projects. He has published more than 100 papers in well-known academic journals, many of which have been cited by famous materials science scholars in many countries. His research interests are advanced metal structure-functional materials theoretical research and mate-rial research and development. He has done a lot of work in high-strength, high-tough materials research, corrosion-resistant materials research, advanced composite materials and high-damping materials. |
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