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13卷    第6期    总第57期    2003年12月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1004-0609(2003)06-1441-06
离心铸造Mg2Si和Si自生增强的锌基合金复合材料
王渠东, 尉胤红, 陈文周, 朱燕萍, 翟春泉, 马春江,丁文江

(上海交通大学 金属基复合材料国家重点实验室, 上海 200030)

摘 要: 采用热模金属型工艺, 离心铸造自生增强的Zn-27Al-6.3Mg-3.7Si合金复合材料。 研究结果表明: 该合金内层聚集大量块状初生Mg↓2Si、 少量块状初生Si, 中层不含初生Mg2Si和初生Si, 外层含少量初生Mg2Si和初生Si; Zn-27Al-6.3Mg-3.7Si合金在凝固过程中, 先后经历了初生Si和初生Mg↓2Si的析出、 富Al的固溶Zn相析出、 Mg-Zn化合物的析出, 以及发生三元或四元共晶反应; 初生Mg2Si和初生Si的位置、 数量和分布决定于其内浮速度和离心力场作用下的凝固速度;含有初生Mg2Si和初生Si的内层和外层比中层具有更高的硬度和耐磨性。

 

关键字: 离心铸造; Zn-27Al-Mg-Si 合金; 自生复合材料; Mg2Si; Si

In-situ (Mg2Si+Si)/Zn matrix composite fabricated by centrifugal casting
WANG Qu-dong, WEI Yin-hong, CHEN Wen-zhou, ZHU Yan-ping,
ZHAI Chun-quan, MA Chun-jiang, DING Wen-jiang

State Key Laboratory of Metal Matrix Composites,
Shanghai Jiaotong University, Shanghai 200030, China

Abstract:In-situ composite of Zn-27Al-6.3Mg-3.7Si alloy was fabricated by centrifugal casting using the heated permanent mold. This kind of composite is consisted of three layers, inner layer segregates lots of blocky primary Mg2Si and a little blocky primary Si, middle layer contains no primary Mg2Si and primary Si, outer layer contains a little. Zn-27Al-6.3Mg-3.7Si alloy solidifies according to following steps: firstly, the precipitation of primary Si and primary Mg2Si, secondly, the precipitation of Zn-phase enriched by Al, thirdly, the precipitation of Mg-Zn compound, and lastly, the occurrence of ternary or quaternary eutectic reaction. The position, quantity and distribution of primary Mg2Si and primary Si are determined by solidification velocity under the effect of centrifugal force and their floating velocity inward. The inner and outer layer contained primary Mg2Si and primary Si exhibit much higher hardness and wear resistance than the middle layer.

 

Key words: centrifugal casting; Zn-27Al-Mg-Si alloy; in-situ composites; Mg2Si; Si

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@mail.csu.edu.cn