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Strain-Rate Dependent Deformation Behavior in WC-10 wt%Ni 3Al Cermet Micropillars Under Uniaxial Compression

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Document pages: 14 pages

Abstract: The strain-rate dependent deformation behavior in WC-10 Ni3Al cermet micropillars was studied by in-situ uniaxial compression. The results show that compression at high strain rates exhibits a relatively smooth stress-strain response compared with that at low strain rates. Microstructural characterization suggests that at high strain rates, grain boundary sliding is the dominant mechanism of deformation, while at low strain rates, dislocation annihilation plays a dominant role. The strain rate sensitivity index also varies with strain rate, confirming that the dominant deformation mechanisms have changed.

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