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Abstract

Charpy impact behaviour of SiC fibre reinforced titanium composites (TMCs)has been examined at a range of temperatures on specimens with fibres orientated longitudinally [0]₈ and transversely [90]₈ to the impact direction. Corresponding monolithic alloys have also been studied. Although monolithic Ti–6Al–4V has the superior ‘bend’ strength at room temperature, Timetal 834 is superior at the operating temperatures of gas-turbine components. The TMCs follow the same trends as the monolithic alloys, but their impact strengths are inferior to the monolithic alloys by an order of magnitude. This is attributed to the low impact strength of the SiC fibres, which dominates in [0]₈ specimens, and the low strength of the fibre/matrix interface, which dominates in [90]₈ specimens. For [0]₈ specimens, Ti-6-4 reinforced with carbon coated SiC fibres (Sigma SM1140+) has consistently superior impact strength compared with the other three TMCs. For [90]₈ specimens, Timetal 834 reinforced with TiB_x/carbon coated SiC fibres (SM1240) exhibits the best impact strength at intermediate temperatures.

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Charpy impact behaviour of Sigma fibre reinforced titanium composites

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