Microstructure, hardness, toughness and oxidation resistance of Al2O3–ZrB2 composite with different Ti percentages prepared by in-situ SHS dynamic compaction
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Abstract
Abstract Effect on microstructure, hardness, modulus, fracture toughness and oxidation behaviour of Al 2 O 3 –ZrB 2 composite with different percentages of Titanium as diluents during the SHS reaction has been studied. It was observed that Ti addition leads to formation of different phases such as TiB 2 , ZrO 2, TiB besides ZrB 2 and Al 2 O 3 . The hardness and modulus were found to be around 21 GPa and 350 GPa, respectively for 10 wt.% Ti addition in dynamic depth indentation. Oxidation study of the sample having 25 wt.% Titanium showed no significant change in phase and mechanical properties after 700 °C oxidation. The toughness of 20 wt.% Ti sample showed highest fracture toughness.
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