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首页> 外文期刊>Philosophical Magazine Letters >High-resolution characterization of the precipitation behavior of an Al-Zn-Mg-Cu alloy
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High-resolution characterization of the precipitation behavior of an Al-Zn-Mg-Cu alloy

机译：Al-Zn-Mg-Cu合金析出行为的高分辨率表征

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The metastable particles in an Al-Zn-Mg-Cu alloy have been examined at atomic-resolution using high-angle annular dark field (HAADF) imaging. In under-aged conditions, thin ?' plates were formed with a thickness of seven atomic planes parallel to the {111}_(al) planes. The five inner planes of the ?' phase appear to be alternatively enriched in Mg and Zn, with two outer planes forming distinct Zn-rich interfacial planes. Similar Zn-rich interfacial enrichment has also been identified for the ? phase, which is a minimum 11-plane thick structure. In rare instances, particles less than seven planes were found indicating a very early preference for seven-layer particle formation. Throughout the aging, the plate thickness appears constant, while the plate radius increases and no particles between 7 and 11 planes were observed. Based on the HAADF contrast, our observations do not support the ?' models previously set forth by other authors. Clear structural similarities between ?' and ? were observed, suggesting that drawing distinctions between ?' and ? phases may not be necessary or useful.
机译：已使用高角度环形暗场（HAADF）成像以原子分辨率检查了Al-Zn-Mg-Cu合金中的亚稳颗粒。在未成年人的情况下，瘦吗？形成具有平行于{111} _（al）平面的七个原子平面的厚度的金属板。 ？的五个内平面相似乎交替富集了Mg和Zn，两个外平面形成了截然不同的富锌界面平面。还发现了类似的富锌界面富集。相，这是最小的11面厚度的结构。在极少数情况下，发现少于七个平面的颗粒表明非常早地偏爱七层颗粒形成。在整个时效过程中，板厚呈现恒定，而板半径增加，并且未观察到7至11个平面之间的颗粒。根据HAADF的对比，我们的观察结果不支持？'。其他作者先前提出的模型。之间明显的结构相似性和？被观察到，这暗示了？'之间的区别。和？阶段可能没有必要或无用。

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