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金属学报  1996, Vol. 32 Issue (2): 113-119    
  论文 本期目录 | 过刊浏览 |
利用Marangoni对流制备均质偏晶合金
冼爱平;张修睦;李忠玉;刘清泉;陈继志;李依依
中国科学院国际材料物理中心;中国科学院金属研究所
PREPARATION OF HOMOGENEITY IMMISCIBLE ALLOY BY MARANGONI CONVECTION
XIAN Aiping; ZHANG Xiumu; LI Zhongyu; LIU Qingquan; CHEN Jizhi;LI Yiyi(International Center for Materials Physics; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-06-06; in revised form 1995-11-07)
引用本文:

冼爱平;张修睦;李忠玉;刘清泉;陈继志;李依依. 利用Marangoni对流制备均质偏晶合金[J]. 金属学报, 1996, 32(2): 113-119.
, , , , , . PREPARATION OF HOMOGENEITY IMMISCIBLE ALLOY BY MARANGONI CONVECTION[J]. Acta Metall Sin, 1996, 32(2): 113-119.

全文: PDF(544 KB)  
摘要: 利用温度场下第二相液滴的Marangoni运动,设计了一种在地球重力场下制备均质偏晶合金的"控制铸造"新技术。在这种技术中,偏晶合金凝固界面前沿的第二相液滴将在重力场下作Stokes运动和在温度梯度场下作与重力方向相反的Marangoni运动。合成运动的净速度与第二相液滴的尺寸有关:尺寸较小时,液滴以Marangoni运动为主;反之则以Stokes运动为主。当液滴净速度为零时,第二相液滴生长到一个临界尺寸,控制其动态稳定性,就可能获得第二相粒子均匀分布的偏晶合金。对第二相液滴的临界尺寸进行了估计,它可以表达为对Al-Bi和Al-Pb偏晶合金控制铸造的初步试验结果表明,Al基体上第二相Pb或Bi的粒子分布与根据上式计算所得的估计在数量级范围大体相当,文中还提出了沉淀孕育期的新概念。
关键词 偏晶合金铸造凝固偏析流体物理    
Abstract:A new control casting technique was designed for making homogeneity immiscible alloy in earth gravity field by Marangoni migration of the secondary phase drops in the melting alloy under a temperature gradient. In the technique, the droplet of the secondary phase ahead the solid-liquid interface of the melt of the immiscible alloy will make Stokes movement in gravity field and Marangoni movement in the opposite direction of gravity field in temperature gradient field. As a result, the net velocity of the droplets in the melt will be dependent on the size of the droplets. When the size of the droplets is very small,Marangoni movement of the droplets will dominate, otherwise Stokes movement will dominate. When the net velocity is zero, there will be a critical size of the droplet. By controlling the stability of the solidification process, an ingot with uniform distribution of the dropletscan be obtained. The critical size of the secondary phase droplets was estimated by the following equation Solidification test on Al-Bi and Al-Pb alloy showed that the size of the Bi or Pb particles in Al matrix is roughly the same order of magnitude as that obtained by above equation.Finally, a new conception, precipitation incubation period, was suggested in the discussion.(Correspondent. XIAN Aiping. professor, Institute of Metal Research, Chinese Academy of Scienoes, Shenyang110015)
Key words immiscible alloy    casting    solidification    segregation    fluid physics
收稿日期: 1996-02-18     
基金资助:中国科学院和国家自然科学基金
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