Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第11卷    第1期    总第40期    2001年2月

[PDF全文下载]        

    

文章编号:1004-0609(2001)01-0006-04
快速凝固高硅铝合金粉末的热挤压过程
张大童, 李元元, 罗宗强, 邱 诚

(华南理工大学 机电工程系, 广州 510640)

摘 要: 通过分析快速凝固高硅铝合金粉末在热挤压过程中的密度、微观组织和相结构的变化,对粉末热挤压成形机理进行了探讨。结果表明,快速凝固高硅铝合金粉末热挤压过程分为2个阶段,即填充挤压阶段和稳态流动阶段,粉末生坯的致密化主要在第一阶段完成。粉末颗粒中初晶Si相受到加热长大和挤压破碎两方面的综合作用,最终得到的挤压材料中的Si颗粒与原始粉末相比没有明显的粗化。合金的相组成在挤压前后没有发生变化,快速凝固合金的组织结构特征基本得以保留。

 

关键字: 快速凝固; 高硅铝合金; 热挤压

Hot extrusion process of rapidly solidified hypereutectic

aluminumsilicon alloy powder

ZHANG Da-tong, LI Yuan-yuan, LUO Zong-qiang, QIU Cheng

Department of Mechanotronic Engineering, South China University of Technology,
Guangzhou 510640, P.R.China

Abstract:By analyzing the changes of the density, microstructures and phase during the hot extrusion process of rapidly solidified (RS) hypereutectic aluminumsilicon powder, the mechanism of powder hot extrusion was studied. Experimental results show that the powder hot extrusion process can be divided into two stages, hot compress process and stable flow process. The density of the billet increases greatly at the first process. Two effects decide the primary silicon particle size: growing due to heating and breaking due to extrusion. However, no change of phase is detected after hot extrusion, and the powder's RS characteristics remain unchanged.

 

Key words: rapid solidification; hypereutectic Al-Si alloy; hot extrusion

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com