Microstructure Evolution during Solution Heat Treatment of Semisolid Cast 2024 Aluminum Alloy
Microstructure Evolution during Solution Heat Treatment of Semisolid Cast 2024 Aluminum Alloy
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DOI：
10.4028/www.scientific.net/amr.339.714
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
S. Pannaray;S. Wisutmethangoon;Thawatchai Plookphol;J. Wannasin
中科院分区：
文献类型：
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作者：
S. Pannaray;S. Wisutmethangoon;Thawatchai Plookphol;J. Wannasin
研究了半固态2024铝合金合适的固溶处理温度和时间。在450°C和480 °C下进行4 ~ 16 h的固溶热处理，然后在220 °C下进行1 h的人工时效，半固态铸造2024铝合金的显微组织主要为由基体-α（Al）和晶界-共晶（α+ Al 2CuMg/Al 2Cu）组成的球状晶粒组织。在480°C下固溶热处理14小时后，发现Eu 3 + GB相完全溶解，而在450°C下处理相同时间的样品溶液显示存在剩余的GB相。在两种温度下14小时后延长热处理导致在晶界处形成粗黑色颗粒，其被鉴定为Mg 2Si相。因此，本研究中合金的合适固溶处理是在480°C下持续14小时。
The aim of this study is to determine the appropriate solution treatment temperature and time of semi solid 2024 Al alloy. Solution heat treatment at 450°C and 480 °C for various times, from 4 hours to 16 hrs, were applied followed by artificial aging at 220 °C for 1 hr. Microstructure of the semi solid cast 2024 aluminum alloy mainly showed globular grain structure which consisted of matrix-α (Al) and grain boundary (GB) - eutectic phases (α+Al2CuMg/Al2Cu). Eutectic GB phases was found to completely dissolved after solution heat treatment at 480°C for 14 hrs while sample solution treated at 450°C for the same time showed the existence of remaining GB phases. Prolonging heat treatment after 14 hrs at both temperatures resulted in the formation of coarse black particles at the grain boundaries which were identified as Mg2Si phases. Therefore the suitable solution treatment of the alloy in this study was at 480°C for 14 hrs.