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Fracture Description of AZ61 Mg-Al2O3 Materials Studied by “In Situ Tensile Test in SEM“

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Abstract:

In situ observation of AZ61 Mg alloy with 5 wt. % of Al2O3 in the SEM was performed to study influence of the weight fraction of Al2O3 particles on the deformation and fracture description during the tensile test. Structure of the experimental materials was also analysed; microstructures were heterogeneous, with randomly distributed globular Al2O3 particles (average diameter of 25 nm) and Mg17Al12 intermetallic phase (average diameter of 0.4 mm). It was shown that during the tensile deformation the failure of Mg17Al12 particles and decohesion of the matrix-Al2O3 particles interphase boundary started simultaneously. Decohesion resulted from the different physical properties of matrix and Al2O3 particles. The influence of the Al2O3 weight fraction on the final fracture was evident; for the material with 5 wt. % of Al2O3, the fracture surface was approximately perpendicular to the loading direction. The fracture surface had transcrystalline ductile character.

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Periodical:

Key Engineering Materials (Volume 674)

Pages:

165-172

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.674.165

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Online since:

January 2016

Authors:

Michael Besterci*, Štefan Nagy, Song Jeng Huang, Oksana Velgosová, Katarína Sülleiová, Priit Kulu

Keywords:

AZ61 Mg – Al2O3, In Situ Tensile Test in SEM, Microstructure, Model of Fracture Mechanism

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