液态Al—Si合金中的共价键及Sr的影响

THE COVALENT BOND IN LIQUID Al-Si ALLOY AND EFFECT OF Sr ON THE BOND

采用液态金属X射线衍射仪分析了不同成分Al-Si合金的液态结构，获得了结构因子曲线，径向分布函数及配位数，对不同成分液态合金径向分布函数进行了5个Gauss峰分解，同时考察了Sr对Al—12．5％Si合金的液态结构的影响．结果表明，在共晶及过共晶的合金的液态结构中，存在着Si—Si共价键，Sr有削弱这些共价键的倾向．

By using high temperature X--ray dffractometer, the structure factor S(Q),radial distribution function 4 and total coordination number of the liquid Al-Si alloy were presented. Radial distribution function of alloy was decomposed by 5 Gaussian peaks, and the elfed of Sron the alloy's liquid structure was investigated. The result showed that Si--Si covalent bond eAsts in the melt of eutectic and hyper--eutectic alloy and Sr has capability to weaken the coto bond.