Atomic force microscopy of transformation toughening in ceria-stabilized zirconia
Atomic force microscopy of transformation toughening in ceria-stabilized zirconia
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DOI：
10.1016/j.jeurceramsoc.2004.07.029
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发表时间：
2005-08-01
影响因子：
5.7
通讯作者：
Chevalier, M
中科院分区：
文献类型：
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作者：
Deville, S;El Attaoui, H;Chevalier, M
在这篇文章中，我们证明原子力显微镜可以成功地用来进一步深入了解CeO_2稳定的氧化锆相变增韧。相变是由双扭转试件扩展裂纹周围积累的应力引起的。原子力显微镜在样品表面提供的分辨率使观察到裂纹附近自适应马氏体对的形成成为可能。相变潜势随合金化加入量的增加而降低，16mol%CeO2-TZP样品的相变潜势被完全抑制。对马氏体对取向进行了统计分析，并讨论了其与外加应力场和应变场的关系。论证了相变诱发塑性在小净切变马氏体变配对形成过程中对相变增韧的贡献。最后讨论了合金加入量对相变增韧潜力和断裂韧度的影响。(C)2004爱思唯尔有限公司。保留所有权利。
We demonstrate in this paper that atomic force microscopy can be successfully used to gain further insights into the understanding of transformation toughening in ceria-stabilized zirconia. Transformation was induced by stresses accumulated in the region surrounding propagating cracks in double torsion samples. The resolution provided by AFM at the surface of the samples made it possible to observe the formation of self-accommodated martensite pairs in the near crack areas. The potential for transformation is found to decrease with increasing alloying addition, and is totally suppressed for 16 mol% CeO2-TZP samples. A statistical analysis of the martensite pair orientation is performed, and the relationship with the applied stress and strain fields is discussed. The contribution to transformation toughening by transformation-induced plasticity occurring in the formation of martensitic variant pairs with small net shear is demonstrated. The influence of alloying addition content on the potential for transformation toughening and fracture toughness values is finally discussed. (c) 2004 Elsevier Ltd. All rights reserved.