Grain structure and dislocation density measurements in a friction-stir welded aluminum alloy using X-ray peak profile analysis
Grain structure and dislocation density measurements in a friction-stir welded aluminum alloy using X-ray peak profile analysis
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DOI：
10.1016/j.msea.2008.08.007
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发表时间：
2008-12
期刊：
影响因子：
6.4
通讯作者：
W. Woo;L. Balogh;T. Ungár;H. Choo;Zhili Feng
中科院分区：
文献类型：
--
作者：
W. Woo;L. Balogh;T. Ungár;H. Choo;Zhili Feng
采用高分辨率微束X射线衍射仪测定了6061-T6铝合金搅拌摩擦焊接头的位错密度和晶粒结构随距焊缝中心线距离的变化。X射线峰形分析结果表明，焊缝区内部位错密度约为1.2× 1014 m − 2，焊缝区外部位错密度约为4.8× 1014 m − 2。两个区域的平均亚晶尺寸约为180 nm。与母材相比，搅拌摩擦焊动态再结晶区位错密度明显降低，这与TEM观察结果有很好的相关性。还讨论了位错密度对拉伸变形过程中应变硬化行为的影响。
The dislocation density and grain structure of a friction-stir welded 6061-T6 aluminum alloy were determined as a function of distance from the weld centerline using high-resolution micro-beam X-ray diffraction. The results of the X-ray peak profile analysis show that the dislocation density is about 1.2×1014m−2inside and 4.8×1014m−2outside of the weld region. The average subgrain size is about 180nm in both regions. Compared to the base material, the dislocation density was significantly decreased in the dynamic recrystallized zone of the friction-stir welds, which is in good correlation with the TEM observations. The influence of the dislocation density on the strain hardening behavior during tensile deformation is also discussed.