Fundamental Study on Preparation of Ultra-Fine-Grained Metal-Matrix Composite Materials by Plastic Working of Amorphous Crystalline and Its Crystallization Treatment

采用机械合金化的方法，将元素铜和钛混合粉末进行机械合金化，得到了非晶态的Ti-43mol%Cu合金。当非晶粉末在0.5K/S恒定升温速率下热处理时，非晶相在640K左右开始晶化，在670K时晶化最活跃。因此，在低于晶化温度的温加工温度范围内对非晶合金进行了粉末挤压。然而，在633K的挤压过程中，非晶基体中形成了平衡的TiCu相。对非晶态Ti-Cu合金与纯铝粉的混合物进行了机械合金化，并研究了该过程中的组织变化。经过长时间的机械合金化，铝的晶粒度变得非常细小，在铝与非晶相的界面处形成了Al-Ti和Al-Cu系金属间化合物。通过对机械合金化粉末的挤压可以制备出由非晶态颗粒在铝基中弥散分布的结构组成的高强度复合材料。

An amorphous Ti-43mol%Cu alloy was obtained by mechanical alloying of mixture of elemental copper and titanium powders. When the amorphous powder was heat-treated under a constant heating-rate of 0.5K/s, the crystallization from amorphous phase starts at about 640K and it becomes to most active at 670K.So, powder-extrusion of the amorphous alloy was carried out at warm-working temperature range of less than the crystallization temperature. However, equilibrium TiCu phase formes in the amorphous matrix during the extrusion at 633K.The mechanical alloying of mixture of the amorphous Ti-Cu alloy and pure aluminum powders was carried out and the structural change with this process was investigated. The grain size of aluminum matrix becomes to extremely fine and the intermetallic compounds of Al-Ti and Al-Cu systems are formed at interface between aluminum and amorphous phases by the mechanical alloying for prolonged time. High-strengthen composite material consisting of the structure with dispersion of amorphous particles in the aluminum matrix can be to product by the extrusion of the mechanically alloyed powder.