A Developed Method for Fabricating In-Situ TiC (p)/Mg Composites by Using Quick Preheating Treatment and Ultrasonic Vibration

作者：Liu, Z. W.^*; Rakita, M.; Han, Q.; Li, J. G.

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2012, 43A(6): 2116-2124.

DOI：10.1007/s11661-011-1041-0

• MATRIX COMPOSITES
• MOLTEN MAGNESIUM
• DIFFUSION
• TITANIUM
• ALUMINUM
• LAYER
• ALLOYS
• GROWTH
• TIAL3
• AL

Quick preheating treatment of the Al-Ti-C pellets and high-intensity ultrasonic vibration are introduced in the fabrication of in-situ TiC (p) /Mg composites. Al-Ti-C pellets are preheated for about 130 seconds in the furnace at 1023 K (750 A degrees C), in which magnesium is melted as well. In this process, plenty of heat can be accumulated due to the reactive diffusion between liquid aluminum and solid titanium in Al-Ti-C, and a small amount of Al3Ti phase is formed as well. After adding the preheated Al-Ti-C into the molten magnesium, thermal explosion takes place in a few seconds. In the meantime, high-intensity ultrasonic vibration is applied into the melt to disperse in-situ formed TiC particles into the matrix and degas the melt as well. Microstructural characterization indicates that in-situ formed TiC particles are spherical in morphology and smaller than 2 mu m in size. Furthermore, a homogeneous microstructure with low porosity of the magnesium composite is obtained due to the effect of ultrasonic vibration. A novel approach using the quick preheating treatment technique and high-intensity ultrasonic vibration to synthesize in-situ TiC (p) /Mg composites is proposed in our research.

• 出版日期2012-6
• 单位上海交通大学