• CN:11-2187/TH
  • ISSN:0577-6686

›› 1989, Vol. 25 ›› Issue (2): 98-104.

• 论文 • 上一篇    

铈在铝铜合金凝固过程中的作用

刘立新;安阁英   

  1. 哈尔滨工业大学
  • 发布日期:1989-03-01

THE ROLE OF THE ELEMENT Ce IN THE SOLIDIFICATION PROCESS OF AI-Cu ALLOYS

Liu Lixin;An Geying   

  1. Harbin Institute o f Technology
  • Published:1989-03-01

摘要: 本文在定向凝固的条件下考察了稀土元素Ce对Al-Cu合金平面生长、胞状生长及枝晶生长的界面稳定性,一次及二次枝晶间距的影响;借此探讨了一般微量合金元素在凝固过程中的作用。研究表明,Ce降低Al-Cu合金的界面稳定性,平面生长时,临界G/V值与Ce含量关系的回归处理结果是:G/V=0.38[4.5+(2~3)C (Ce)](Al-4.5%Cu)。Ce含量较小时减小一次枝晶间距,但含量较大时反而增加一次枝晶间距。随着Ce含量的增加,二次枝晶间距减小。分析表明,只有当微量合金元素的平衡分配系数k很小及C 0/k较大时,才会对合金的凝固过程产生明显影响。

关键词: 定向凝固, 界面稳定性, 铝铜合金, 稀土元素, 枝晶间距

Abstract: The effects of Ce on the planar, cellular and dendritic interface stability, and the primary and secondary arm spacing have been investigated under directional solidification conditions in this paper. With the help of the investigation, the role of common elements in the solidification process is analysed and discussed. The results show that Ce decreases the stability of the interface; for planar growth, least squares linear regression analyses give the relationship between the critical value of G/V and Ce content as follows: G/V = 0.38[4.5+ (2~3) Cce] (A1-4.5%Cu). Ce decreases the primary arm spacing for the low Ce content regime but increases the primary spacing for the high Ce content regime. The secondary arm spacing decreases with the increase in Ce content. The analyses show that the microelements have apparent effects on the solidification process of alloys only for them to have very small equilibrium distribution coefficients k and large Co/k.

Key words: 定向凝固, 界面稳定性, 铝铜合金, 稀土元素, 枝晶间距