Herein, the strain rate–dependent deformation mechanism of WC–10 wt% Ni₃Al cermet micropillars is 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, whereas at low strain rates, dislocation annihilation plays the dominant role. The strain rate sensitivity index also varies with the strain rate from 1 × 10⁻² to 5 × 10⁻³ s⁻¹, confirming that the dominant deformation mechanisms change in this range.

中文翻译：

---

WC–10 wt％Ni3Al硬质合金的微柱压缩与应变率相关的变形机理研究

本文中，通过原位单轴压缩研究了WC–10 wt％Ni ₃ Al金属陶瓷微柱的应变率依赖性变形机理。结果表明，与低应变速率相比，高应变速率下的压缩表现出相对平稳的应力-应变响应。显微组织表征表明，在高应变速率下，晶界滑动是变形的主要机制，而在低应变速率下，位错an没起主要作用。应变速率敏感性指数也随着应变速率从1×10 ^-2到5×10 ^-3  s ^-1变化，证实了主要的变形机制在该范围内变化。