Rapidly solidified Al-Si-Mg alloy

被引：0

作者：

Rios, CT ^{[1
]}

Bolfarini, C ^{[1
]}

Botta, WJ ^{[1
]}

Kiminami, CS ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil

来源：

ISMANAM 2003: METASTABLE, MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS | 2004年 / 20-21卷

关键词：

Al-Si-Mg system; intermetallic compounds; rapid solidification;

D O I：

暂无

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Rapid solidification processes, RSP, are powerful tools to induce microstructural modifications, which may improve mechanical properties of metallic alloys. In this paper the influence of rapid solidification on the formation of the undesirable brittle intermetallic compounds promoted by Mg, Si and Fe in Al-9Si-0.7Mg (A359-type) alloy have been investigated by using of water-cooled wedge-copper mould for the rapid solidification process. The microstructures have been evaluated by using a combination of X-ray diffraction (XRD), optical (OM), scanning (SEM) and transmission electron microscopy (TEM), and by Vickers microhardness. By increasing the cooling rate the secondary dendritic arm spacing decreased and the formation of Mg2Si and Al8Si6Mg3Fe phases were suppressed. At the same time an increase in the hardness was observed. These microstructural and mechanical properties changes associated with the rapid solidification process might be attributed to the increased solid solution content of the alloying elements in the Al matrix.

引用

页码：594 / 598

页数：5

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