Effect of retrogression and reaging treatment on the microstructure and fatigue crack growth behavior of 7050 aluminum alloy thick plate
Effect of retrogression and reaging treatment on the microstructure and fatigue crack growth behavior of 7050 aluminum alloy thick plate
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DOI：
10.1016/j.matdes.2013.09.063
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发表时间：
2014-03
影响因子：
8.4
通讯作者：
Yi Lin Wang;Q. Pan;Li Wei;Bo Li;Ying Wang
中科院分区：
文献类型：
--
作者：
Yi Lin Wang;Q. Pan;Li Wei;Bo Li;Ying Wang
采用扫描电镜（SEM）、透射电镜（TEM）和电子背散射衍射（EBSD）等手段，研究了回归再时效（RRA）处理对7050铝合金厚板组织和疲劳裂纹扩展行为的影响。结果表明，RRA组织与T6处理的相似，但晶粒内部略致密、粗化，且本质上更稳定。晶界析出相明显粗化，呈不连续孤立分布。无沉淀区（PFZ）比T6样品的宽，比T7451样品的窄。RRA处理可以保持与T6峰时效处理相同的强度，并提高与T7451过时效处理相同的抗疲劳裂纹扩展能力。
Effect of Retrogression and Reaging (RRA) treatment on the microstructure and fatigue crack growth behavior of 7050 aluminum alloy thick plate was investigated by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The results showed that the RRA microstructure is similar to that for T6 treatment inside the grains, but is slightly denser and coarser and more stable in nature. Also grain boundaries precipitates (GPBs) coarsen obviously, distributing discontinuously and isolated. The precipitation free zones (PFZs) are broadened than that of the T6 sample, and narrower than that of the T7451 sample. And maintaining strength equal to that for the T6 peak-aged treatment and enhanced fatigue crack growth resistance to that for the T7451 overaged treatment can be achieved for RRA treatment.