超重力对Pb-Sn合金偏析行为的影响  

Effect of Supergravity on Segregation Behavior of Pb-Sn Alloy

作　　者：李京伟[1] 孙士瞳[1] 郭占成[1] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《有色金属（冶炼部分）》2012年第12期47-51,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51174187);国家科技支撑计划项目(2011BAE03B01)

摘　　要：以Pb-Sn合金为例,利用离心旋转加热炉研究了超重力对金属凝固组织偏析行为的影响。结果表明,在超重力条件下,不同比例Pb-Sn合金凝固组织均出现分层现象,其中密度较小的富锡相富集在试样上部,而密度较大的富铅相则沉降在试样底部,中间为共晶组织,而且随着重力系数的增加这种分层现象也愈加明显。在存在密度差的情况下,超重力可以实现Pb-Sn合金中不同组织的偏析和分层。The effect of supergravity on the segregation behavior of solidification microstructure of m was studied within the centrifugal furnace with Pb-Sn alloy as a sample. The results show that vis stratification occurs on Pb-Sn alloys which solidify under different supergravity fields. Under etal ible supergravity field, Pb-rich （the denser solid） particles precipitate toward to the bottom of the sample and Sn-rich particles float to the its top. The segregation also becomes obvious with increase of gravity coefficient. Segregation and stratification of microstructure on Pb-Sn alloy could be realized under superg- ravity.

关 键 词：超重力 PB-SN合金 偏析 凝固组织 分层 

分 类 号：TG146.12[一般工业技术—材料科学与工程] TG146.14[金属学及工艺—金属材料]