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

采用机械合金化方法，将单质Cu和Ti粉末混合，得到Ti-43mol%Cu非晶合金。当非晶粉末在0.5K/s的恒定升温速率下进行热处理时，非晶相在640 K左右开始晶化，在670 K时晶化最活跃，因此非晶合金的粉末挤压在低于晶化温度的温加工温度范围内进行。在633 K挤压过程中，非晶基体中形成了平衡TiCu相。将非晶Ti-Cu合金与纯Al粉末混合进行机械合金化，研究了机械合金化过程中合金组织的变化。长时间机械合金化使铝基体的晶粒尺寸变得非常细小，在铝与非晶相的界面处形成Al-Ti和Al-Cu系金属间化合物。采用机械合金化方法制备的铝基复合材料，可以获得非晶颗粒弥散分布的高强度复合材料。

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.