Al-Si合金的成分和其凝固收缩率与摩尔体积的关系  

The Relationship of Chemical Compositions, Solidification Shrinkage and Molar Volume of Al-Si Alloys

作　　者：李少博 坚增运[1] 许军锋[1] 朱满[1] 党博[1] 

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021

出　　处：《铸造》2015年第7期609-614,共6页Foundry

基　　金：国家自然科学基金(No.51171136,No.51371133,No.51401156)

摘　　要：依据阿基米德原理,通过测量合金在熔盐中所受浮力,对不同硅含量铝硅合金的凝固收缩率、液相的摩尔体积及Al在铝硅合金中的偏摩尔体积进行了研究。结果发现:铝硅合金的凝固收缩率随着硅含量的增大而减小;硅含量超过25%后,铝硅合金凝固后表现为体积膨胀;当合金硅含量在12.6%至25%之间时,不同铝硅合金在各自液相线温度下熔体的摩尔体积和在754℃下熔体的摩尔体积均随硅含量的增大而减小,当合金硅含量由25%增大至30%时,上述两种摩尔体积均随硅含量的增大而增大;随着硅含量由12.6%增大至25%,754℃时Al在不同硅含量铝硅合金熔体中的偏摩尔体积增大。The study of the solidifice.tion shrinkage, the liquid molar volumes and the partial molar volumes of A1 content of aluminum silicon alloys is performed by measuring the buoyancy forces of alloys sinking in molten salt, according to Archimedes principle. It＇s found that the shrinkage decreases with the increase of Si content. When the Si content is above 25wt.%, the A1-Si alloys will expand after solidification. When the Si content increases from 12.6wt.% to 25wt.%, the molar volumes of A1-Si alloy melts at each liquidus temperature tend to decrease, so does the molar volumes of melts at 754 ℃, but when the Si content increases from 25wt.% to 30wt.%, an opposite tendency appears. The partial molar volumes of aluminum in A1-Si alloy melts at 754 ℃ increase along with the increase of Si content from 12.6wt.% to 25wt.%.

关 键 词：AI-Si合金 凝固收缩率 熔盐 摩尔体积 

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]