强磁场对Al-Si合金中共晶硅生长的影响  

Growing behavior of eutectic Si in Al-Si alloy with high magnetic field

作　　者：连峰[1,2] 李廷举[2] 

机构地区：[1]大连海事大学机电与材料工程学院,辽宁大连116026 [2]大连理工大学材料工程学院,辽宁大连116024

出　　处：《轻合金加工技术》2009年第10期17-20,共4页Light Alloy Fabrication Technology

基　　金：国家自然科学基金资助项目(50234020)

摘　　要：对亚共晶Al-6%Si合金进行钠盐变质处理后,分别在不施加与施加强磁场的条件下,在液相区740℃、固液两相区590℃和固相区470℃三个温度,使合金快速冷却,观察到了共晶硅的不同生长过程。磁感应强度B=0T时,共晶硅由短小的层片状至较长的层片状直至尖锐的纤维状;B=10T时,共晶硅由细小的弥散分布至复杂的丛簇状直至圆钝的颗粒状。即施加强磁场可以改变共晶硅的生长形态。After Na-salt modification of Al-6wt % Si, quickly cooling the samples from 74022 （liquid phase）, 59022 （solid-liquid phase） and 47022 （solid phase） under the conditions with and without magnetic filed respectively, then the different configurations of eutectic Si could be observed. When B = 0 T, the eutectic Si in solidified structure of the sample quickly cooled from 740℃ is short-layer-like. The eutectic Si in solidified structure of the sample quickly cooled from 590℃ is long-layer-like. The eutectic Si in solidified structure of the sample quickly cooled from 470℃ is sharped-acicnlar-like. When B = 10 T, the eutectic Si in solidified structure of the sample quickly cooled from 740℃ was thin and distributed evenly. The eutectie Si in solidified structure of the sample quickly cooled from 590℃ is cluster-like. The eutectic Si in the solidified structure of the sample quickly cooled from 470℃ was ball-particle-like and distributed evenly. It could be said that magnetic filed could improve the quality of the modification.

关 键 词：强磁场 AL-SI合金 共晶硅 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG244[金属学及工艺—金属材料]