Abstract
It is quite obvious that the spectrum of structure-sensitive properties of superconducting ceramics is caused directly by essential inhomogeneous structure, consisting of superconducting grains, secondary phases, pores and microdefects, as a rule disposed on intergranular boundaries. The microstructure formation and fracture occur during sintering, causing internal (residual) stresses and during the material loading by different thermo-mechanical and electromagnetic fields. Based on computer simulation, a joint study of sintering, cooling and fracture of the structure-heterogeneous material allows a prediction and an optimization of superconductor properties depending on the parameters, including composition, heat rate, initial porosity of material.
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Notes
- 1.
However, in contrast to infinite growth of the process zone, stated in [928], even for grain sizes, which are smaller than the critical one, in reality the process zone must be finite. This contradiction is the consequence of the selected model in [928] for array of hexagonal grains, in which all grain boundaries have the same length, l, and on each of them the triple point (microcrack nucleus) exists. Therefore, for \( l \to l_{c}^{S} \) the condition h m  → ∞ is reached. Our model is free from the above shortcoming.
- 2.
In particular, the tetragonal–orthorhombic phase transition in YBCO superconductor demands oxygen diffusion into crystalline lattice [473].
- 3.
For example, the foams which expand in transverse cross-section when they are subjected to tension relates to the materials with negative Poisson’s ratio. Negative Poisson’s ratio is demonstrated by also several mono-crystals and layered structures [965]. Hierarchical layered structures [1701] can demonstrate values of Poisson’s ratio achieving −1 [1153]. The foam materials with negative Poisson’s ratio possessing non-convex cellular structure have been already designed and processed [963]. Moreover, there have been developed and prepared similar 2D structures [985, 1812]. The value of Poisson’s ratio which is equal to −1 could be achieved in chiral cellular structure [1398].
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© 2012 Springer-Verlag Berlin Heidelberg
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Parinov, I.A. (2012). Computer Simulation of HTSC Microstructure and Toughening Mechanisms. In: Microstructure and Properties of High-Temperature Superconductors. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34441-1_10
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DOI: https://doi.org/10.1007/978-3-642-34441-1_10
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