Synthesis of Ternary Machinable Al₂O₃/Ti₂AlC Composites by High Energy Milling and In Situ Hot-Pressing Method

Abstract:

Al2O3/Ti2AlC composites were synthesized by high energy milling and hot-pressing at 1200°C in a vacuum furnace with a pressure of 4.8×10-2 Pa, using Ti, Al and C powder as raw materials. The effect of sintering temperature on the reactions, phase composition and microstructure of the synthesized products were investigated. The results show that the TiC and TiAl intermetallics composite powders were synthesized during the milling process. After the hot pressing, Ti2AlC phase was formed by the reaction between TiC and TiAl. A small amount of Al2O3 was also produced because of the oxidation of Al in the hot press process, which formed Al2O3/Ti2AlC composite together with the Ti2AlC at 1200°C. The fine grained Al2O3 particles disperse within Ti2AlC uniformly, which play a important role to strengthen Ti2AlC matrix, resulting in the increase of flexural strength and fracture toughness from 250 to 275.4MPa, 9.8 to 10.5MPa•m1/2, respectively.

• Periodical: Materials Science Forum (Volume 658)
• Pages: 169-172
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.658.169
• Online since: July 2010
• Authors: Fen Wang, Bo Bo Liu, Jian Feng Zhu, Ya Ling Li
• Keywords: Al₂O₃/Ti₂AlC, High Energy Milling (HEM), Hot-Pressing, Microstructure

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