您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 4    August 2006

[PDF Download]    [Flash Online]

    

Microstructure evolution of Cu-Pb monotectic alloys during directional solidification
CUI Hong-bao(崔红保), GUO Jing-jie(郭景杰), SU Yan-qing(苏彦庆),
DING Hong-sheng(丁宏生), WU Shi-ping(吴士平), BI Wei-sheng(毕维生),
XU Da-ming(徐达鸣), FU Heng-zhi(傅恒志)

School of Materials Science and Engineering, Harbin Institute of Technology,
Harbin 150001, China

Abstract: Planar, cellular and dendrite morphologies were observed at different concentrations in the directional solidification of Cu-Pb monotectic alloys. In Cu-Pb hypomonotectic alloys, the directional solidification microstructure changes from columnar dendrite to the irregular rod composite structure with increasing lead content and growth rate. In Cu-Pb hypermonotectic alloys, the structure changes from the band structure and elongated droplets to irregular rod composite structure with increasing growth rate. The range of composition of forming the rod composite structure around the monotectic points increases with the increasing growth rate. The transient morphology of Cu-Pb alloys in the directional solidification was obtained. The solid/liquid interface of Cu-Pb alloys presents planar and the second liquid droplets are pushed by growing front under the high temperature gradient. With increasing growth rate or decreasing temperature gradient the planar interface becomes unstable and the cellular structures with L2 phase at the cell boundaries are developed.

 

Key words: copper-lead monotectic alloy; directional solidification; transient morphology; microstructure evolution

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn