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研究了等径弯曲通道变形过程中７４７５铝合金的组织细化及超细化，在７４７５铝合金中实现了亚微晶组织，晶粒尺寸达到 ０．４～０．６ μｍ；提出的 ＥＣＡＰ－Ａ晶粒细化工艺，可将 ７４７５铝合金的晶粒尺寸细化到６～８μｍ，而且相当稳定，这一指标优于以前的ＴＭＰ工艺和ＪＴＭＰＡ工艺．
The microstructure and the refinement of 7475 aluminum alloy during the deformation of equal-diameter curved channels were studied. The microstructure of the 7475 aluminum alloy was realized with the grain size of 0.4-0.6 μm. The proposed ECAP- A grain refinement process, 7475 aluminum alloy grain size can be refined to 6 ~ 8μm, and quite stable, this indicator is better than the previous TMP process and JTMPA process.