MICROSTRUCTURE OF A SINTERED 16.5 MOL PERCENT CEO2-ZRO2 ALLOY AT CRYOGENIC TEMPERATURE

摘要

The microstructure of a fine grained 16.5 mol % CeO2 - stabilized tetragonal zirconia polycrystal (Ce-TZP) has been investigated by transmission electron microscopy observations. The results show that the samples fractured at 298, 77 and 4.2 K change significantly. At 298 K, there is no stress-induced martensite but a few anti-phase boundaries (APB) in the tetragonal (t) parent phase. With a decrease in testing temperature, monoclinic (m) product, or martensite within retained t phase, appears. Its morphologies are characterized as lenticular and block-like at 77 K and as lenticular and butterfly-like at 4.2 K. The relationship between microstructure and mechanical properties is also discussed. [References: 17]