Based on theoretical analyses, the effect of electric current density on stability of solidification interface mor-phology of QAl24 alloy was studied experimentally. The results show that the experimental results agree well with the theoretical analyses, and the following conclusions can be drawn: the increase of electric current density improves the stability of the solidification interface morphology under the condition of no convection of the liquid metal. Otherwise this convection will slow down the trend of solidification interface developing to stability caused by increasing electric current density.

When current passes through the solid-liquid interface, the growth rate of crystal, solid-liquid interface energy and radius of curvature at dendritic tip will change. Based on this fact, the theoretical relation between the distribution of solute at solid-liquid interface and current density was established, and the effect of current on the distribution coefficient of solute through effecting the rate of crystal growth, the solid-liquid interface energy and the radius of curvature at the dendritic tip was discussed. The results show that as the current density increases, the distribution coefficient of solute tends to rise in a whole, and when the former is larger than about 400 A/ cm-, the latter varies significantly.

A continuous unidirectional solidification equipment with the advantages of electric-slag remelting, induction heating, continuous casting and unidirectional solidification was built to study the QAl924 Cu-Al alloy. The results show that the electro-slag induction continuous unidirectional solidification process can be used for the steady continuous unidirectional solidification of QAl924, and revitalizes the down-pulling continuous unidirectional solidification process; that the temperature distribution in the mold wall reflects that of the molten metal in the mold, thus the temperature distribution in the mold wall can be used to control the electric-slag induction continuous unidirectional solidificationprocess; and that the mutual matching of the technological parameters is the key to stabilize the solidification process.

近年来出现轧辊复合层连续铸造工艺方法，使生产的复合轧辊的强韧性和耐磨性显著提高。轧辊复合层连续铸造法是将轧辊心垂直放在水冷铸型中，将金属液浇注到复合层结晶器与轧辊心的间隙中，通过加热器的加热，使金属液熔合轧辊心外表面，并经冷却器后顺序向上凝固，将凝固部分连续向下拉拔，实现连续铸造复台层。

退火成矿环境研究是近年来矿床学发展的新方向之一，丰富多彩的退火结构、构造现象在越来越多的热液矿床中被发现，足以说明退火环境在热液矿床成矿过程中的重要性，然而这些理论研究以往并未得到实验的验证。本项目通过退火模拟实验，成功地再现了凡口矿区的矿石和围岩的退火结构、构造和独特的球状闪锌矿晶粒的重结晶加大现象，证实了退火重结晶作用是凡口特大型铅锌矿床成矿作用的一个重要方面，开拓了矿床学研究的新领域。