Effect of Carbon-Nanotube Addition on Thermal Stability of Ti-based Metallic Glass Composites

摘要

The preparation of Ti_(50)Cu_(28)Ni_(15)Sn_7 metallic glass composite powders was accomplished by the mechanical alloying of a pure Ti, Cu, Ni, Sn and carbon nanotube (CNT) powder mixture after 8 h milling. In the ball-milled composites, the initial CNT particles were dissolved in the Ti-based alloy glassy matrix. The thermal stability of the amorphous matrix is affected by the presence of the CNT particles. Changes in T_g and T_x suggest deviations in the chemical composition of the glassy matrix due to a partial dissolution of the CNT species in the amorphous phase. The bulk metallic glass composite was successfully prepared by vacuum hot pressing the as-milled CNT/ Ti_(50)Cu_(28)Ni_(15)Sn_7 metallic glass composite powders. A significant hardness increase with the CNT additions was observed for the consolidated composite compacts.