Simultaneous improvement of strength and ductility of Al-Mg-Si alloys by combining equal-channel angular extrusion with subsequent high-temperature short-time aging
Simultaneous improvement of strength and ductility of Al-Mg-Si alloys by combining equal-channel angular extrusion with subsequent high-temperature short-time aging
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DOI：
10.1016/j.msea.2008.02.051
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发表时间：
2009-03-15
期刊：
影响因子：
6.4
通讯作者：
Krueger, L.
中科院分区：
文献类型：
--
作者：
Hockauf, M.;Meyer, L. W.;Krueger, L.
研究了室温等通道转角挤压(ECAE)前固溶处理的6060铝合金在较宽的温度、时间和ECAE预应变范围内的时效行为。结果表明，高温短时时效对提高钢的强度和塑性最为有效。与商用的粗晶峰值时效条件相比，在170℃下一次挤压时效18min后，极限抗拉强度和均匀延伸率均提高了35%左右。竞争回复和析出活性对提高Al-Mg-Si合金的塑性起着重要作用。这项工作展示了一种高效加工具有优异机械性能的UFG铝合金的策略。(C)2008爱思唯尔B.V.保留所有权利。
The aging behaviour after room temperature (RT) equal-channel angular extrusion (ECAE) of the pre-ECAE solid-solution treated 6060 Al alloy was investigated in wide ranges of temperature, time, and ECAE prestrain. It is shown that high-temperature, short-time aging is most effective in improving both strength and ductility. Compared to the commercially available peak aged condition with coarse grains, an increase of similar to 35% in both ultimate tensile strength and uniform elongation was obtained after one extrusion and aging at 170 degrees C for 18 min. Competing recovery and precipitation activity play a significant role in enhancing the ductility of Al-Mg-Si alloys. This work demonstrates a strategy for an efficient processing of UFG Al alloys with outstanding mechanical properties. (c) 2008 Elsevier B.V. All rights reserved.