Structures of Liquid Al-Si Alloy Modified by Sr
Structures of Liquid Al-Si Alloy Modified by Sr
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DOI：
10.4028/www.scientific.net/msf.331-337.349
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发表时间：
2000-05
期刊：
影响因子：
--
通讯作者：
X. Bian;W. Wang;J. Qin
中科院分区：
文献类型：
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作者：
X. Bian;W. Wang;J. Qin
用高温X射线衍射仪测定了锶变质Al-Si液态合金的结构。利用径向分布函数得到了不同硅含量的液态Al-Si合金的结构因子和配位数，研究了共晶Al-Si合金变质前后的最近原子距离和配位数，并用5个高斯峰分解了液态Al-Si合金的径向分布函数。这些结果表明，液态共晶和过共晶合金中存在Si-Si共价键。液态Al-Si中的锶有能力削弱Si-Si的共价键，抑制共晶硅相的形核。
The structures of liquid Al-Si alloys modified by Sr were measured by using a high temperature x-ray diffractometer. The structure factor and the coordination numbers of liquid Al-Si alloys with different Si content have been obtained by Radial distribution functions, the nearest atomic distance and the coordination numbers of eutectic Al-Si alloys were studied, before and after being modified with Sr. The radial distribution functions of the liquid alloys were decomposed by 5 Gaussian peaks. These results show that Si-Si covalent bond exists in the liquid eutectic and hypereutectic alloys. Sr in the liquid Al-Si has a capability to weaken the covalent bonds of Si-Si, suppressing the nucleation of eutectic silicon phase.