Publications in Scientific Journals:

E. Marks, G. Requena, H.P. Degischer, E. Boller:
"Microtomography and creep modeling of a short fiber reinforced aluminum piston alloy";
Advanced Engineering Materials, 13 (2011), 3; 199 - 207.

English abstract:
Short fibre reinforced metals (SFRM) have shown promising mechanical properties at elevated temperature, leading to applications for combustion engines where some components locally reinforced with short fibres (SF) have been developed. To ensure the reliability of such materials under long-term temperature/load exposure, the mechanisms controlling their thermomechanical behaviour are to be known.
In previous studies, a short fibre reinforced AlSi12CuMgNi alloy showed a decrease in stationary creep rate with the creep exposure time extending several thousand hours at 300 C. Microtomographic evaluations revealed microstructural changes of the Si phase, specially of the interconnectivity between Si, SFs and intermetallics.
Models of creep behaviour of SFRM have focused on the spatial arrangement of the fibres, the influence of damage, the work hardened zone between matrix and fibres, and the constitutive creep law of the matrix material but few have studied the influence of the interpenetrating architecture of the rigid phases.
In the present investigation a three-dimensional unit cell finite element (FE) model is proposed in order to study the influence of the 3D connectivity between Si and SFs on the creep resistance of AlSi-based SFRM. This simple model is based on 3D microstructural features and it is correlated with experimental results.

"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)

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