Abstract
The oxidation tests of Ti 3 AlC 2 were conducted at 1100 and 1200 °C in air for 48 and 360 h, respectively, and the effects of high temperature oxidation on the flexural strength and hardness of Ti 3 AlC 2 were investigated. The microstructure, grain size and phase compositions of Ti 3 AlC 2 substrate didn't change after oxidation, hence the oxide removed Ti 3 AlC 2 substrate maintained its initial flexural strength and hardness. However, the flexural strength of oxide retained Ti 3 AlC 2 decreased by about 5%. Acoustic emission monitoring indicated that during the process of three-point bending test, the formed Al 2 O 3 scale on Ti 3 AlC 2 surface fractured firstly in a cleavage manner, then the substrate/oxide interface cracked, and finally the Ti 3 AlC 2 substrate fractured. The mechanical degradation was caused by the preferential formation of cracks in brittle Al 2 O 3 scale as well as at defective and lacunose grain boundaries of the substrate where stress concentration generated. The mechanical degradation was insensitive to oxidation temperature and time in the present conditions. In addition, the surface hardness increased significantly after oxidation due to the formed hard Al 2 O 3 scale on the surface of Ti 3 AlC 2 substrate.
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