Formation and structure of icosahedral and glassy phases in melt-spun Al-Si-Mn.
Formation and structure of icosahedral and glassy phases in melt-spun Al-Si-Mn.
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DOI：
10.1103/physrevb.35.3715
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发表时间：
1987-03
期刊：
影响因子：
--
通讯作者：
Chen;Koskenmaki
中科院分区：
文献类型：
--
作者：
Chen;Koskenmaki
快淬Al-Si-Mn合金的X射线散射和电子透射显微镜表明，Al-Mn二十面体相本身可以在16 - 20原子的组成范围内一致生长。Mn和Si原子选择性地取代Al原子。线宽ΔQ的Q依赖性表明Hendrick-Teller无序占主导地位，然而，也存在常规无序。玻璃态Al-Si-Mn合金在Qp = 1.6 A <$− 1处显示出明显的预峰，在主峰的低Q侧（Qp = 3.0 A <$− 1）有一个明显的肩峰，表明在结晶金属间相中存在着强的化学有序性。
X-ray scattering and electron-transmission microscopy of melt-spun Al-Si-Mn alloys reveal that the Al-Mn icosahedral phase itself can grow congruently over a range of composition varying from 16 to 20 at.? Mn, and Si atoms substitute Al atoms selectively. The Q dependences of linewidth ΔQ suggest that Hendrick-Teller disorder is dominant; however, the conventional disorders are also present. The glassy Al-Si-Mn alloys show a pronounced prepeak at Q p≊ 1.6 A ̊− 1 and a marked shoulder at the low-Q side of the main peak (Q≊ 3.0 A ̊− 1), suggesting a strong chemical order persisting in the crystalline intermetallic phases.