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8122 |
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Wednesday, May 01, 2024, Blue 1 2:40 PM Additive Manufacturing II |
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The effect of powder particle size on mechanical and fracture properties of cold sprayed Al |
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Ondrej Kovarik* / Czech Technical University, Czech Republic Thomas Klassen / Helmut-Schmidt-Universität/Universität der Bundeswehr Hamburg, Germany Chunjie Huang/ Helmut-Schmidt-Universität/Universität der Bundeswehr Hamburg, Germany Levke Wiehler/ Helmut-Schmidt-Universität/Universität der Bundeswehr Hamburg, Germany Jan Cizek/ Institute of Plasma Physics of the CAS, Czechia Frank Gärtner/ Helmut-Schmidt-Universität/Universität der Bundeswehr Hamburg, Germany Filip Wick/ FNSPE, CTU, Czechia Alexanber List/ Helmut-Schmidt-Universität/Universität der Bundeswehr Hamburg, Germany |
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Thick deposits were produced from pure Al powder of three different particle sizes using cold spraying at the same process parameters. The in-plane mechanical and fracture properties of these deposits were investigated using bending of small specimens. It was shown that increasing the Al particle size by ~50% and ~100% leads to different sizes, qualities and geometries of the features at particle-particle interfaces. Particularly the sizes of non-bonded interfaces are reflected by a statistically significant decrease of yield strength and ultimate tensile strength. The cyclic loading at near-threshold stresses did not show any significant relation to the particle size, but at static and high amplitude cyclic loading, the fracture properties were actually better for the coarser powders. This finding can be attributed to two different fracture mechanisms in the cold sprayed deposits: a trans-particular fracture in the near-threshold fatigue regime, i.e., a limited effect of the particle interfaces, which changed to the particle decohesion at higher loads. Here, the different particle interface morphology and local mechanical properties shaped the respective fracture modes. |