| 快速凝固Fe62.1Sn27.9Si10合金的分层组织和偏晶胞形成机理 |
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| 引用本文： | 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):108101-108101. |
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| 作者姓名： | 李志强 王伟丽 翟薇 魏炳波 |
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| 作者单位： | 西北工业大学 应用物理系,西安 710072 |
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| 基金项目： | 国家自然科学基金(批准号:50971105)和西北工业大学基础研究基金(批准号:JC201050)资助的课题. |
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| 摘 要： | 采用自由落体和单辊急冷技术研究了三元Fe62.1Sn27.9Si10偏晶合金的相分离和组织形成规律,理论分析了两种快速凝固条件下合金的传热特性.自由落体条件下,由于Marangoni迁移和表面偏析势的作用,液滴凝固组织主要形成富Sn相包裹富Fe相的两层壳核结构.随着液滴直径减小,冷却速率和温度梯度增大,促进偏晶胞快速生长.在单辊急冷条件下,随着辊速的增大,冷却速率从1.1×107增大至6.5×107 K/s,合金熔体内部的液相流动和相分离受到抑制,凝固组织发生"九层结构→两层结构→无分层结构"的转变.同时,凝固过程中FeSn+L2→FeSn2包晶反应受到抑制,形成与自由落体条件下不同的相组成.EDS分析显示,αFe相在快速凝固过程中发生显著溶质截留效应.
关键词：
Fe-Sn-Si偏晶合金
相分离
快速凝固
溶质截留
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| 关 键 词： | Fe-Sn-Si偏晶合金 相分离 快速凝固 溶质截留 |
| 收稿时间： | 2010-10-13 |
Formation mechanism of layered microstructure and monotectic cell within rapidly solidified Fe62.1Sn27.9Si10 alloy |
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| Li Zhi-Qiang,Wang Wei-Li,Zhai Wei and Wei Bing-Bo.Formation mechanism of layered microstructure and monotectic cell within rapidly solidified Fe62.1Sn27.9Si10 alloy[J].Acta Physica Sinica,2011,60(10):108101-108101. |
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| Authors: | Li Zhi-Qiang Wang Wei-Li Zhai Wei and Wei Bing-Bo |
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| Affiliation: | Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China;Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China;Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China;Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China |
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| 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.Wi... |
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| Keywords: | Fe-Sn-Si monotectic alloy phase separation rapid solidification solute trapping |
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