Origin of the prepeak in the structure factors of liquid and amorphous Al-Fe-Ce alloys
Origin of the prepeak in the structure factors of liquid and amorphous Al-Fe-Ce alloys
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DOI：
10.1088/0953-8984/11/41/301
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发表时间：
1999-10
期刊：
影响因子：
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通讯作者：
Zhang Lin;Y. Wu;X. Bian;Li Hui;Weimin Wang;Jingguo Li;Lun Ning
中科院分区：
文献类型：
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作者：
Zhang Lin;Y. Wu;X. Bian;Li Hui;Weimin Wang;Jingguo Li;Lun Ning
在液态和非晶态Al-Fe-Ce合金的结构因子中发现了明显的预峰。液态合金中与预峰对应的化学短程有序结构尺寸随温度的降低而增大，玻璃形成后，结构尺寸更大，与预峰对应的结构数量随淬火温度的降低而增加，但结构单元尺寸保持不变。随着Ce浓度的增加，预峰的位置向较小的Q值移动。Ce的加入可以改善原子之间的相互作用，从而有利于铝基玻璃的成形性。对应于预峰的结构单元是以Fe作为间隙原子的二十面体准晶结构，并且预峰是由相当细（约0.5- 2.0nm）的二十面体团簇引起的衍射峰展宽。
Distinct prepeaks have been found in the structure factors of the liquid and amorphous Al-Fe-Ce alloys. The structural size of the chemical short-range order corresponding to the prepeak in the liquid alloy increases with decreasing temperature, and, after glass forming, the structural size is much bigger, and the amount of the structure corresponding to the prepeak increases with decreasing quenching temperature, but the structural unit size remains constant. The position of the prepeak shifts to smaller Q-values as the concentration of Ce increases. The addition of Ce can improve the interaction between atoms, so it is favourable to Al-based glass formability. The structural unit corresponding to the prepeak is an icosahedral quasicrystalline structure with Fe as the interstitial atom, and the prepeak is diffraction peak broadening caused by fairly fine (about 0.5-2.0 nm) icosahedral clusters.