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The phase transition of multi-component (TiZrVNb)C ceramics - EurekAlert


A series of (TiZrVxNb)C0.8 ceramics with different V content were fabricated by spark plasma sintering (SPS). The influence of the V content on the phase compositions, microstructural evolution, and mechanical properties was investigated in detail. The transition behavior from single phase to multiple phases is discovered and discussed. The formation of the Zr-rich phase and Zr-poor phase can be attributed to the increase of lattice distortion and mixed enthalpy by adding the V element. The obtained nanometer lamellar structure with a semi-coherent interface via in-situ decomposing is reported for the first time in multi-component carbide ceramics. The semi-coherent interfaces with the high dislocation density and strain concentration have an effective influence on the improvement of mechanical properties as well as grain refinement and multi-phase formation. This work offers a potential approach to adjusting microstructure from single phase to multiple phases in multi-component carbide ceramics for achieving novel mechanical properties.

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