Al-Si 16%合金的过热温度与结晶行为  

RELATION OF SUPERHEATING TEMPERATURE AND SOLIDIFI CATION IN Al Si 16% ALLOY

作　　者：王伟民[1] 边秀房[1] 秦敬玉[1] 鲁典照 

机构地区：[1]山东工业大学材料学院 [2]青岛生建机械厂

出　　处：《机械工程学报》1999年第3期16-19,共4页Journal of Mechanical Engineering

基　　金：国家自然科学基金

摘　　要：研究了不同过热温度对Ａｌ－Ｓｉ１６％结晶组织的影响，发现当过热温度超过９００℃后，试样中的初晶硅尺寸与数目大量增加，共晶硅的尺寸变小。ＤＳＣ分析表明，一定程度的过热增加了Ａｌ－Ｓｉ１６％的结晶潜热。液态Ｘ射线研究发现，在９００℃以下，Ａｌ－Ｓｉ１６％的平均配位数比相同温度纯铝低，而在９００℃以上，合金的平均配位数要高。１２５０℃温度过热后，合金熔体在液相线上方就已出现与硅晶态相对应的衍射峰。过热温度对结晶行为的影响可用Ａｌ－Ｓｉ１６％熔体中Ａｌ－Ｓｉ原子团在较高过热温度下向Ｓｉ－Ｓｉ原子集团转化的机制来解释。The effect of superheating on the solidification in Al Si 16% alloy is investigated. It is showed that the amount and size of the primary silicon phase increased greatly after superheating of high temperature (>900 ℃). The latent heat and initial temperature of primary solidification also increased obviously after high temperature superheating (>900 ℃) by DSC analysis. By the way of X ray diffractometer, it is found that the atomic coordination number of Al Si 16% alloy is higher than pure Al at high temperature (>900 ℃) and less than pure Al at low temperature (<900 ℃). The peaks implied solid Si phase appeared on diffraction intensity cure of liquid Al Si 16% alloy after superheating of high temperature while they were absent in the case of low temperature superheating.

关 键 词：过热温度 结晶 铝硅合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG292[金属学及工艺—金属材料]