Identification of AlSi10Mg matrix behavior by nanoindentation
(2021) ESAFORM2021 — Location: Online Conference (14.April.2021)
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- Abstract
- Laser powder bed fusion is an additive manufacturing technique that is widely used to produce AlSi10Mg parts with a good strength-to-weight ratio and a very fine microstructure thanks to high cooling rates. However, to obtain better mechanical properties, a good ductility and higher fatigue resistance, post-treatments have to be performed. In this work, friction stir processing, a thermomechanical post-treatment, is applied on an as-built plate of 5 mm thickness. This post-treatment leads to a decrease of the percentage of porosities and to modification of the microstructure: globularised Si-rich particles are surrounded by the α-Al phase. The method presented uses nanoindentation to determine the behaviour of the different phases present in the material for future numerical simulations and a better understanding of the relation between microstructure and fatigue strength. The Bucaille's method is used (Bucaille et al., Acta Mater., 2003) to determine the links between indentation curves and elastoplastic parameters. Three different pyramidal indenters are used: Berkovich, cube corner and an indenter with a centerline-to-face angle of 50°. From the post processing of the loading/unloading curves, the Young's modulus, the representative strain and the associated stress are determined. With the three different indenters and their three true stress/true strain points, a good description of the elastoplastic behavior can be defined.
- Affiliations
Université de Liège Science des Matériaux métalliques Université de Liège Mécanique des Solides et des Matériaux
Citations
Dedry, O., Bouffioux, C., Tran, H. S., Santos Macias, J. G., Habraken, A. M., & Mertens, A. (2021). Identification of AlSi10Mg matrix behavior by nanoindentation. ESAFORM2021, Online Conference. https://hdl.handle.net/2078.5/114724