摘要
采用 Al-(3．4—15)%Bi(质量分数)难混溶合金进行了快速连续凝固实验,研究了 Bi 含量和凝固速率对快速连续凝固组织的影响．结果表明,少量富 Bi 相粒子尺寸随着 Bi 含量的增加而增大,提高凝固速率有助于制备少量富 Bi 相粒子均匀分布的难混溶合金．通过分析富 Bi 粒子尺寸分布,发现沿试样轴向和径向方向粒子平均直径变化不大,试样表层处粒子尺寸较小．研究表明,快速连续凝固是制备均质难混溶合金的有效途径．
The experiment of rapid continuous solidification of Al-Bi immiscible alloys with composition ranged from 3.4% to 15% （mass fraction） Bi has been carried out. The influences of the Bi content and the casting rate on the microstructure evolution during the rapid continuous solidification have been investigated. It has been indicated that the average size of the Bi-rich particles increases with the increase of the Bi content. Increasing the casting rate is in favor of the preparation of immiscible alloy with dispersed microstructure. The size distribution of the Bi-rich particles has been analyzed, and it was shown that the size variation of the Bi-rich particles along the axial and radial directions of the sample is not distinct, while on the sample surface the particle size is relative small. It is indicated that the rapid continuous solidification is a potential technique to be used in the manufacturing of immiscible alloy.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第1期67-72,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金项目50271076和50371092
中德科学基金项目GZ032/1资助~~
关键词
Al—Bi难混溶合金
快速连续凝固
凝固速率
显微组织
Al-Bi immiscible alloy, rapid continuous solidification, solidification rate,microstructure
