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- W3089443616 abstract "The superior fracture toughness of zirconia is closely correlated with stress-induced martensitic phase transformation around a crack tip. In this study, a modified phase field (PF) model coupling phase transformation and fracture is proposed to study the fracture behavior and toughening effect of tetragonal zirconia polycrystal (TZP). The stress-induced tetragonal to monoclinic (t-m) phase transformation around a static or propagating crack is characterized with PF simulations. It is shown that the finite size and shape of the transformation zone under different loads and ambient temperatures can be well predicted with the proposed PF model. The phase transformation may decrease the stress level around the crack tip, which implies the toughening effect. After that, crack propagation in TZP is studied. As the stress field is perturbed by the phase transformation patterns, the crack may experience deflection and branching in the propagation process. It is found that the toughness of the grain boundaries (GBs) has important influences on the crack propagation mode. For TZP with strong GBs, the crack is more likely to propagate transgranularly while, for TZP with weak GBs, intergranular crack propagation is prevalent. Besides that, the crystal orientation and the external load can also influence the topology of crack propagation." @default.
- W3089443616 created "2020-10-08" @default.
- W3089443616 creator A5036015135 @default.
- W3089443616 creator A5046240324 @default.
- W3089443616 creator A5061733763 @default.
- W3089443616 date "2020-10-05" @default.
- W3089443616 modified "2023-10-17" @default.
- W3089443616 title "Study of the Fracture Behavior of Tetragonal Zirconia Polycrystal with a Modified Phase Field Model" @default.
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- W3089443616 doi "https://doi.org/10.3390/ma13194430" @default.
- W3089443616 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7579669" @default.
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- W3089443616 hasPublicationYear "2020" @default.
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