How do the grains slide in fine-grained zirconia polycrystals at high temperature?

Details How do the grains slide in fine-grained zirconia polycrystals at high temperature? How do the grains slide in fine-grained zirconia polycrystals at high temperature?

2007-09-26

arxiv.org/abs/0709.4138v1

Appl. Phys. Lett. 91, 121904 (2007)

Physics

Condensed Matter

Materials Science

12 pages, 3 figures

Scientific paper

10.1063/1.2784210

Degradation of mechanical properties of zirconia polycrystals is hardly discussed in terms of solution-precipitation grain-boundary sliding due to experimental controversies over imaging of intergranular amorphous phases at high and room temperatures. Here, the authors applied the techniques of mechanical spectroscopy and transmission electron microscopy (TEM) to shed light on the amorphization of grain interfaces at high temperature where the interface-reaction determines the behaviour of fine-grained zirconia polycrystals. They present mechanical spectroscopy results, which yield evidences of an intergranular amorphous phase in silica doped and high-purity zirconia at high temperature. Quenching of zirconia polycrystals reveals an intergranular amorphous phase on TEM images at room temperature.

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