Influence of gravity on the microstructure of directionally solidified Ag-Si eutectic alloy
Influence of gravity on the microstructure of directionally solidified Ag-Si eutectic alloy
复制标题
重力对定向凝固Ag-Si共晶合金显微组织的影响
DOI：
10.2320/matertrans1989.40.27
复制
发表时间：
1999
影响因子：
1.2
通讯作者：
H. Nakae
中科院分区：
文献类型：
--
作者：
Ichiro Aoi;M. Yoshida;H. Fukunaga;H. Nakae
为了研究重力对Ag-Si和Al-Si合金共晶生长的影响，进行了向下（重力方向）和向上（与重力方向相反）的单向凝固实验。在U.D.S.向下的情况下，熔融金属被限制在坩埚和固体之间。这不可避免地在凝固过程中在固/液界面处产生缩孔。在这项研究中，区域熔化技术被用来避免这种空腔的形成。研究结果表明：（1）在U.D.S.在Ag-Si合金中，共晶硅相呈不连续生长，分散在α-Ag相中，直径约为几微米。这是由银和硅相之间的比重差异大所引起的。另一方面，在U.D.S.上升的情况下，硅相连续生长，其形态显示出典型的小面/非小面共晶。(2)Al-Si合金中的共晶硅相无论生长方向如何都是连续生长的。U.D.S.向上和向下之间没有形态学差异。标本
In order to study the influence of gravity on the eutectic growth of Ag-Si and Al-Si alloys, both the downward (direction of gravity) and upward (opposite to direction of gravity) unidirectional solidifications were carried out. In the case of the downward U.D.S., the molten metal is confined between the crucible and solid. This inevitably produces the shrinkage cavity at the solid/liquid interface during solidification. In this study, the zone-melting technique was used to avoid this cavity formation. The results of this study were as follows: (1) In the case of the downward U.D.S. of the Ag-Si alloy, the eutectic silicon phase grew discontinuously and dispersed in the α-Ag phase with a diameter of several micrometers. This is caused by the large difference in specific density between silver and the silicon phase. On the other hand, in the case of the upward U.D.S., the silicon phase grew continuously and its morphology showed the typical faceted/non-faceted eutectic. (2) The eutectic silicon phase of the Al-Si alloy grew continuously regardless of growth direction. There was no morphological difference between the upward and downward U.D.S. specimens.