ABSTRACT

The composition of precipitates in peak-aged Al-Zn-Mg-Cu alloys with various Zn/Mg ratios has been investigated by atom probe tomography (APT). The results show that the η′ and the T′ phases have different compositions with a similar Zn/Mg ratio in the same alloy. The Zn/Mg ratio within precipitates was shown to be positively correlated with the Zn/Mg ratio in the alloy. Moreover, the size dependency of composition for ageing precipitates in Al-Zn-Mg-Cu alloys has been determined. This study enriches the understanding of precipitate composition relative to that of the bulk in Al-Zn-Mg-Cu alloys.

中文翻译：

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Al-Zn-Mg-Cu合金中块体和析出物成分的相关性

摘要

通过原子探针断层扫描 (APT) 研究了具有各种 Zn/Mg 比的峰值时效 Al-Zn-Mg-Cu 合金中的析出物成分。结果表明，在同一合金中，η' 相和 T' 相具有不同的组成，具有相似的 Zn/Mg 比。析出物中的 Zn/Mg 比与合金中的 Zn/Mg 比呈正相关。此外，已经确定了 Al-Zn-Mg-Cu 合金中时效析出物成分的尺寸依赖性。本研究丰富了对 Al-Zn-Mg-Cu 合金中沉淀物成分相对于体相成分的理解。