Evolution of microstructures and mechanical properties in similar and dissimilar friction stir welding of AA5086 and AA6061
Evolution of microstructures and mechanical properties in similar and dissimilar friction stir welding of AA5086 and AA6061
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DOI：
10.1016/j.msea.2011.07.056
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发表时间：
2011-10-25
期刊：
影响因子：
6.4
通讯作者：
Kokabi, A. H.
中科院分区：
文献类型：
--
作者：
Aval, H. Jamshidi;Serajzadeh, S.;Kokabi, A. H.
研究了AA6061-T6和AA5086-O相似和不同搅拌摩擦焊的热力学行为和显微组织演变。首先，利用三维有限元软件ABAQUS预测了材料在相似和不同摩擦焊工况下的热力学行为，然后结合实验观察和模型预测研究了焊接试样的力学性能和形成的显微组织。研究发现，AA5086和AA6061的强化机制不同，导致焊接断面硬度变化复杂，其中相似的AA5086- o接头的硬度变化主要依赖于焊缝熔核的再结晶和细晶粒的产生，而AA6061/AA6061和AA6061/AA5086接头焊缝区的硬度变化受后续时效现象的影响。实验和预测数据均表明，与采用相同焊接参数的其他接头相比，AA6061/AA6061的FSW峰值温度最高。(C) 2011 Elsevier B.V.版权所有
In this work, thermo-mechanical behavior and microstructural evolution in similar and dissimilar friction stir welding of AA6061-T6 and AA5086-O have been investigated. Firstly, the thermo-mechanical behaviors of materials during similar and dissimilar FSW operations have been predicted using three-dimensional finite element software, ABAQUS, then, the mechanical properties and the developed microstructures within the welded samples have been studied with the aid of experimental observations and model predictions. It is found that different strengthening mechanisms in AA5086 and AA6061 result in complex behaviors in hardness of the welded cross section where the hardness variation in similar AA5086-O joints mainly depends on recrystallization and generation of fine grains in weld nugget, however, the hardness variations in the weld zone of AA6061/AA6061 and AA6061/AA5086 joints are affected by subsequent aging phenomenon. Also, both experimental and predicted data illustrate that the peak temperature in FSW of AA6061/AA6061 is the highest compared to the other joints employing the same welding parameters. (C) 2011 Elsevier B.V. All rights reserved.