Abstract

The aging hardening and evolution of precipitation phase of 7136 aluminum alloy during aging treatment were investigated. The research revealed that hardness of 7136 aluminum alloy firstly increases and then slightly decreases with increasing aging time, and reaches maximum values, which are about 198 HB when aging for 24 h. In addition, the dissolution peak of GP zones shifts towards high temperatures and coincides with that is characteristic of the dissolution peak of η' phase in the DSC curve; meanwhile, the dissolution peak area of η′ phase enlarges with increasing aging time. During aging progressing, the GP zones formed at first, then gradually dissolved, transformed into the η' phase, and eventually evolved into the η phase. Furthermore, the average size of the precipitated phase within the crystal increased from 3 to 5 nm, and the average size of grain boundary precipitation phase particles increases from 10 nm to about 20 nm with increasing aging time.

中文翻译：

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7136铝合金时效处理的组织演变过程

摘要

研究了7136铝合金在时效处理过程中的时效硬化和析出相的演变。研究表明，7136铝合金的硬度随着时效时间的增加先增加后略有下降，达到最大值，时效24h时约为198HB。此外，GP区的溶解峰向高温移动，与DSC曲线中η'相的溶解峰特征一致；同时，η'相的溶解峰面积随着老化时间的增加而增大。在时效过程中，GP 区首先形成，然后逐渐溶解，转变为 η' 相，最终演化为 η 相。此外，晶体内析出相的平均尺寸从 3 nm 增加到 5 nm，