Grain Size-Effect on Intergranular Cracking in Shape Memory Zirconia During Cyclic Martensitic Transformations

Crystal, Isabel R.; Schuh, Christopher A.

doi:10.2139/ssrn.3681175

Cited by 2 publications

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“…In the case of SMAs, previous work has investigated the tendency of Cu-based SMAs to fracture along grain boundaries due to strain incompatibilities there [16][17][18]. In SMCs, grain boundary strain incompatibility is less studied, although recent work has provided significant insights [9,[19][20][21]. Pang et al [19] investigated the two-dimensional compatibility of the martensiteaustenite interface via the application of the cofactor conditions as a possible factor controlling the cracking of bulk polycrystalline zirconia-based SMCs.…”

Section: Introductionmentioning

confidence: 99%

“…The same authors [20] analyzed the differences in thermally-induced transformation behaviors between ZrO 2 -CeO 2 oligocrystalline powders and sintered pellets. The role of grain boundaries in the damage evolution of yttria-doped zirconia subject to thermal cyclic loading was also discussed in [9,21]. However, these works focused on the thermally triggered transformation, which involves more degrees of freedom in the selection of transformation variants as compared with a stress-triggered transformation such as is relevant for superelasticity.…”

Section: Introductionmentioning

confidence: 99%

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Phase transformation and incompatibility at grain boundaries in zirconia-based shape memory ceramics: a micromechanics-based simulation study

et al. 2022

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Zirconia-based shape memory ceramics (SMCs) exhibit anisotropic mechanical response when undergoing elastic deformations as well as during austenite–martensite phase transformation. This behavior results in different types of strain incompatibility at grain boundaries, which we study here using a micromechanical model. A single-crystal model is implemented to provide a full mechanistic three-dimensional description of the anisotropic elastic as well as martensitic transformation stress–strain response, including non-Schmid behavior caused by the significant volume change during martensitic transformation. This model was calibrated to and validated against compression tests of single-crystal zirconia micro-pillars conducted previously, and then used to model bi-crystals. Upon the introduction of a grain boundary, the simulation provides detailed information on the nucleation and evolution of martensite variants and stress distribution at grain boundaries. We identify bi-crystal configurations which result in very large stress concentrations at very low deformations due to elastic incompatibility, as well as others where the elastic incompatibility is relatively low and stress concentrations only occur at large transformation strains. We also show how this approach can be used to explore the misorientation space for quantifying the level of elastic and transformation incompatibility at SMCs grain boundaries. Graphical abstract Micromechanics models provide insights on grain boundary elastic and phase transformation strain incompatibility in shape memory zirconia

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