laser冲击3 Y- TZP陶瓷的纳秒时间分辨X射线衍射研究
Reversible phase transition in laser-shocked 3Y-TZP ceramics observed via nanosecond time-resolved X-ray diffraction
摘要：
亚稳四元氧化锆的高压相稳定性仍有争议。利用纳秒时间分辨X射线衍射直接研究了Y_2O_3（3mol%）稳定的四元氧化锆陶瓷在激光冲击压缩下的相变动力学。马氏体相变的单斜相，这是在环境压力和室温下的纯氧化锆的稳定相，已被观察到在5 GPa压缩20 ns内没有任何中间体。该单斜相在压力释放期间回复到四斜相。结果表明，由于添加Y_2O_3的稳定效果是否定的压缩下的剪切应力。
英文摘要：
The high-pressure phase stability of the metastable tetragonal zirconia is still under debate. The transition dynamics of shocked Y2O3 (3 mol%) stabilized tetragonal zirconia ceramics under laser-shock compression has been directly studied using nanosecond time-resolved X-ray diffraction. The martensitic phase transformation to the monoclinic phase, which is the stable phase for pure zirconia at ambient pressure and room temperature, has been observed during compression at 5 GPa within 20 ns without any intermediates. This monoclinic phase reverts back to the tetragonal phase during pressure release. The results imply that the stabilization effect due to addition of Y2O3 is negated by the shear stress under compression.
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