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在应变幅控制下，研究了桥用铝合金在两种热处理工艺下的循环特性及其微观结构的变化。结果表明：在应变幅为△ε＿ｔ／２＝０．４％～１．０％范围内，热处理工艺Ⅰ合金循环软硬化现象不明显，热处理工艺Ⅱ合金表现为循环硬化特性。ＴＥＭ分析表明，不同热处理工艺下合金循环断裂时均已形成结构清晰形状完整的胞状位错结构，影响胞结构形成的主要因素可能是层错能、应变幅等，与材料的组织状态没有关系。
Under the control of strain amplitude, the cycling characteristics and microstructure changes of bridge aluminum alloy under two heat treatment processes were studied. The results show that in the range of △ ε_t / 2 = 0.4% ~ 1.0%, the cycle hardening and tempering of the alloy Ⅰ is not obvious, and the alloy Ⅱ is characterized by cyclic hardening. TEM analysis shows that the cell disintegration structure with clear shape and shape has been formed during the cyclic rupture of alloy under different heat treatment processes. The main factors that affect the formation of cell structure may be the stacking fault energy, strain amplitude, etc., and have no relation with the tissue state of the material.