Abstract
High-purity high residual resistivity ratio niobium is used to fabricate particle accelerator cavities for advanced superconducting accelerators. This material has an unstable texture that causes different r values in different inplane directions, which evolve with deformation, making prediction of forming characteristics difficult. Thus, an evolutionary yield function having coefficients that evolve with plastic deformation is introduced to account for gradients in microstructure and texture that evolve differently in different layers of the material. With such a model, failure modes and locations are predicted accurately in more complex deformation conditions.
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Zamiri, A., Jiang, H., Bieler, T.R. et al. Applying evolutionary yield function to predicting the deformation of microstructure-sensitive high-RRR niobium. JOM 60, 70–75 (2008). https://doi.org/10.1007/s11837-008-0094-z
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DOI: https://doi.org/10.1007/s11837-008-0094-z