本文用TEM及HREM研究了A1 -Cu -Mg合金中S系列时效强化相.研究发现2024铝合金在T62制度时效下的S相顶端存在共生有序结构与应变场.相应的OFT分析表明有序结构产生附加衍射斑点。通过对时效序列和时效机制的讨论,作者提出了与以往有所不同的观点:1.S系列时效强化相的时效序列:G.P(1)G.P(2)S+共生有序结构S+SS。2. S相生长遵循一个循环过程:
Abstract
The precipitate strengthening phases in AA2024-T62 have been investigated by TEM and HREM.It has been found that S' phase coexists with an ordered structore surrounded by strain field.The corresponding OFT analysis proves that the ordered structure produces additional diffraction spots.The aging process and aging mechanism of the A1-Cu-Mg Alloy have been discussed, Unlike current view,the aging process and growing process of S' phase can be described as follows:1.G.(1)G.P(2)S'+co-existing ordered structureS'+SS.2.Strain fieldCu,Mg atoms richco-existing ordered structureS'.
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