PSI - Issue 77

Valeria Lemkova et al. / Procedia Structural Integrity 77 (2026) 279–291 Valeria Lemkova and Florian Schaefer / Structural Integrity Procedia 00 (2026) 000–000

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Fig. 8. 2D plane strain FE simulation of isotropic elastic (a) SiO 2 and (b) Al 2 O 3 particles in elastic isotropic Ni matrix. The main shear stress component is shown.

It was shown that the mechanical contrast must be considered in a more complex way than proposed in literature. Ceramics are not sti ff er than a metal matrix per se. However, this di ff erence in sti ff ness has a considerable influence on the dispersion process and therefore on the development of the microstructure via Zener pinning. The process of dispersion during HPT is still a matter of debate. It is important to consider the mechanical contrast between matrix and particle since this contrast determines the excess stresses at particle edges and therefore particle erosion. Non the less, the HPT route can be considered to manufacture smart materials. The ceramic particles can be further functionalized and hence add besides mechanical and thermal enhancements a multipurpose to the embedments.

Acknowledgements

We are indebted to the Graduate School of Saarland University (GradUS) for financial support with travel costs during specimen preparation. We thank Andrea Bachmaier and Peter Kurtlesa from Erich Schmid Institute Leoben (A) for their help during the project and their assistance with specimen manufacturing and we thank Christoph Pauly from Saarland University for doing the TEM lift-outs as well as Christian Motz from Saarland University for many fruitful discussions.

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