Microstructure mapping in friction stir welds of 7449 aluminium alloy using SAXS
Microstructure mapping in friction stir welds of 7449 aluminium alloy using SAXS
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DOI：
10.1016/j.actamat.2006.06.015
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发表时间：
2006-10
期刊：
影响因子：
9.4
通讯作者：
M. Dumont;A. Steuwer;A. Deschamps;M. Peel;P. Withers
中科院分区：
文献类型：
--
作者：
M. Dumont;A. Steuwer;A. Deschamps;M. Peel;P. Withers
本文介绍了时效硬化的高强度7449铝合金搅拌摩擦焊的微观组织响应。使用两种焊接工具平移速度焊接自然老化（T3）和过老化（T79）条件下的板。通过空间分辨的小角度X射线散射在焊接板的横截面上获得沉淀物的体积分数和尺寸的地图，并通过透射电子显微镜进行直接观察。对焊缝特征区域的析出物体积分数和尺寸的空间变化进行了定量评估，并得到了补充硬度测量的支持。讨论了初始显微组织和焊接速度的影响，特别是在热影响区和热机械影响区。
This paper describes the microstructural response of an age-hardenable, high-strength 7449 aluminium alloy to friction stir welding. Plates in the naturally aged (T3) and over-aged (T79) conditions were welded using two weld tool translation speeds. Maps of precipitate volume fraction and size were obtained by spatially resolved small-angle X-ray scattering over a cross-section of the welded plate, complemented by direct observations made by transmission electron microscopy. The spatial variations of precipitate volume fraction and size were assessed quantitatively for the characteristic zones of the welds, and supported by complementary hardness measurements. The effect of initial microstructure and welding speed, in particular in the heat-affected and thermomechanically affected zones, is discussed.