物理学报2011，Vol.60Issue(10)：705-714,10.
快速凝固Fe62.1Sn27.9Si10合金的分层组织和偏晶胞形成机理
Formation mechanism of layered microstructure and monotectic cell within rapidly solidified Fe62.1Sn27.9Si10 alloy
摘要
Abstract
Ternary Fe62.1Sn27.9Si10 monotectic alloy is rapidly solidified in drop tube with the freely-falling-body techniqual and with melt spinning method separately.The phase separation,the microstructure characteristics,and the heat transfer of this alloy are investigated theoretically.Under free fall condition,the core-shell structure with two layers is formed because of Marangoni migration and surface segregation,where the Sn-rich phase is always located at droplet surface and the Fe-rich phase in the center.With the decrease of droplet diameter,both cooling rate and temperature gradient increase quickly,which facilitates the rapid growth of monotectic cell.With the increase of wheel speed,the cooling rate of alloy ribbon increases from 1.1×107 to 6.5×107 K/s,the fluid flow and the phase separation are suppressed to a great extent,and the ＂nine layers → two layers → no layer＂ structural transition occurs during the rapid solidification of Fe62.1Sn27.9Si10 alloy obtained by the melt spinning method.Meanwhile,the FeSn＋L2→FeSn2 peritectic transformation is also suppressed,thus resulting in different phase constitutions as compared with the case of free fall condition.The energy dispersive spectroscopy（EDS） analysis reveals that the αFe phase exhibits a conspicuous solute trapping effect during rapid solidification.关键词
Fe-Sn-Si偏晶合金/相分离/快速凝固/溶质截留Key words
Fe-Sn-Si monotectic alloy/phase separation/rapid solidification/solute trapping分类
矿业与冶金引用本文复制引用
李志强,王伟丽,翟薇,魏炳波..快速凝固Fe62.1Sn27.9Si10合金的分层组织和偏晶胞形成机理[J].物理学报,2011,60(10):705-714,10.基金项目
国家自然科学基金 （）
西北工业大学基础研究基金（批准号：JC201050）资助的课题 （）
