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Unusual fatigue behavior of friction-stir welded Al-Mg-Si alloy

机译：搅拌摩擦焊接Al-Mg-Si合金的异常疲劳行为

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摘要

In this work, high-cycle fatigue behavior of friction-stir welded AA6061-T6 was studied. An emphasis has been made on the inter-relationship between microstructure, residual stress and fatigue resistance. The welds were produced under optimized conditions, including a combination of relatively high welding temperature and rapid cooling rate, and subsequently undergone a standard post-weld aging heat treatment. The optimized welds exhibited excellent fatigue performance that was comparable (or even superior) to that of the base material. This result was attributed to a considerable grain refinement in the stir zone, subtle material softening in the heat affected zone as well as to significant residual stress generated during the optimized FSW.
机译：在这项工作中，研究了搅拌摩擦焊AA6061-T6的高周疲劳行为。已经强调了微观结构，残余应力和抗疲劳性之间的相互关系。焊缝是在优化的条件下生产的，包括较高的焊接温度和快速的冷却速度，随后进行了标准的焊后时效热处理。经过优化的焊缝具有出色的疲劳性能，可与基础材料媲美（甚至更好）。该结果归因于搅拌区的大量晶粒细化，热影响区的细微材料软化以及优化的FSW期间产生的显着残余应力。

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