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金属学报  2004, Vol. 40 Issue (1): 20-26     
  论文 本期目录 | 过刊浏览 |
包晶合金定向凝固平界面前沿的形核分析
李双明;刘林;李晓历;傅恒志
西北工业大学凝固技术国家重点实验室
Nucleation At Plane Front In Directionally Solidified Peritectic Alloys
LI Shuangming; LIU Lin; LI Xiaoli; FU Hengzhi
State Key Laboratory of Solidification Processing; Northwestern Polytechnical University
引用本文:

李双明; 刘林; 李晓历; 傅恒志 . 包晶合金定向凝固平界面前沿的形核分析[J]. 金属学报, 2004, 40(1): 20-26 .
, , , . Nucleation At Plane Front In Directionally Solidified Peritectic Alloys[J]. Acta Metall Sin, 2004, 40(1): 20-26 .

全文: PDF(185 KB)  
摘要: 利用成分过冷和充分形核判据以及定向凝固中相稳定生长的最高界面温度假设, 在包 晶合金定向凝固初始过渡区及其之后两相低速平界面凝固时建立了初生相和包晶相界面前 沿发生第二相形核转变所满足的成分条件, 确定了不同凝固距离下出现两相平界面 凝固带状组织的成分区间. Fe--Ni和Pb--Bi包晶合金理论计算结果与现有的实验 结果进行了对比, 两者吻合较好.
关键词 成分过冷定向凝固包晶合金    
Abstract:The directionally solidified microstructures of peritectic alloys are affected markedly by the nucleation and growth conditions. By using nucleation and constitutionalsupercooling criterion and assuming that the maximum interface growth temperature of phase growth is more stability in the directional solidification process, the composition range is theoretically developed for predicting the nucleation at the plane-front growth of properitectic and peritectic phases in an initial transient zone. The band--like microstructure occurs as a function of solidification distance and composition range is described on the basis of the purely diffusivemodel. The calculated results of Fe--Ni and Pb--Bi peritectic alloys are in agreement with their experimental data.
Key wordsconstitutional supercooling    directional solidification
收稿日期: 1900-01-01     
ZTFLH:  TG111.4  
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