The structure and the properties of S-phase in AlCuMg alloys
The structure and the properties of S-phase in AlCuMg alloys
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DOI：
10.1016/j.actamat.2011.08.009
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发表时间：
2011-11
期刊：
影响因子：
9.4
通讯作者：
Ziran Liu;Jian Chen;S. B. Wang;D. Yuan;M. Yin;C. Wu
中科院分区：
文献类型：
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作者：
Ziran Liu;Jian Chen;S. B. Wang;D. Yuan;M. Yin;C. Wu
s相是高强度2xxx （AlCuMg）铝合金中重要的强化相之一。尽管如此，s相的晶体结构仍然存在争议，因此其物理性质几乎是未知的。利用电子显微镜的原子分辨率成像和第一性原理能量计算，最终证实了Perlitz和Westgren于1943年提出的结构模型是发育良好的s相沉淀的唯一正确模型。1943年Perlitz和Westgren提出的结构模型是唯一正确的模型。对s相结构的详细计算分析表明，结构中Cu-Mg键和Cu-Al键的基本特征是金属键，但由于原子间的电子电荷转移而具有离子特征，导致s相析出物具有较大的弹性模量，对AlCuMg合金具有强化作用。
The S-phase is one of the key strengthening precipitate phases in high-strength 2xxx (AlCuMg) aluminum alloys. Nonetheless, the crystal structure of the S-phase remains controversial, and therefore its physical properties are almost unknown. Using atomic-resolution imaging in electron microscopy and first-principles energy calculations, it was confirmed at last that the structure model proposed by Perlitz and Westgren in 1943 is the only right model for well-developed S-phase precipitates. The structure model proposed by Perlitz and Westgren in 1943 is the only right model. Detailed calculations analysis of the S-phase structure reveals that the characteristics of Cu–Mg bonding and Cu–Al bonding in the structure are basically metallic, but with an ionic character due to electron charge transfer between atoms, leading to a large elastic modulus for the S-phase precipitates to strengthen AlCuMg alloys.