Miniaturization effects on the tensile behavior of multicrystalline and polychristalline nickel-based superalloy: Influence of grain size, free surface and precipitation state
October 2 – 7, 2022
Surface effects on the mechanical response of polycrystalline materials are particularly important for miniaturized components due to their high surface-to-volume ratio. The influence of a free surface on the mechanical response of materials has been extensively studied on different polycrystalline model materials. A significant decrease of the tensile properties (yield strength, ultimate tensile strength, strain-to-failure) has been observed with the reduction of the specimen thickness [1-4]. This evolution in tensile properties is called polycrystalline-to-multicrystalline transition by A. Thompson  and is mainly attributed to the presence of the free-surface allowing the escape of dislocations. This leads to a significant decrease in the density of dislocations in the surface grains compared to the core grains [3,4]
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Damien Texier, Vincent Velay, Antonio Castro Moreno, Daniel Monceau, Daniel Hourcade, and Eric Andrieu, "Miniaturization effects on the tensile behavior of multicrystalline and polychristalline nickel-based superalloy: Influence of grain size, free surface and precipitation state" in "Nanomechanical Testing in Materials Research and Development VIII", Sandra Korte-Kerzel, RWTH Aachen University, Germany Eds, ECI Symposium Series, (2022). https://dc.engconfintl.org/nanomechtest_viii/104