Microscale deformation of intermetallic-Mg interface under shear loading
Abstract
While intermetallic (IM)-metal interfaces in metallic alloys are critical for tuning mechanical properties, they can also act as failure sites, underscoring the importance of determining their strength. This study reports on a novel microshear geometry, and demonstrates its applicability for testing the strength and deformation behavior of IM-metal interfaces in Mg-Al-Ca alloys, a key material for light weight automotive applications. The shear tests are applied to a model bi-layered system grown by magnetron sputtering, comprising of a CaMg2 film deposited onto a Mg layer. A parametric study was performed using finite element modeling to optimize the specimen dimensions. Subsequently, in situ microshear tests conducted inside a scanning electron microscope revealed an interface shear strength of ~136 MPa, and provided insights into the stages of deformation progression. Post mortem examination of the sheared interface revealed an irregular surface indicating ductile deformation at room temperature.
Authors 7
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Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Max Planck Institute for Sustainable Materials , 40237 Düsseldorf , Germany
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Affiliation as printed
Materials Chemistry , RWTH Aachen University , 52074 Aachen , Germany
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Affiliation as printed
Materials Chemistry , RWTH Aachen University , 52074 Aachen , Germany
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Affiliation as printed
Materials Chemistry , RWTH Aachen University , 52074 Aachen , Germany
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Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Max Planck Institute for Sustainable Materials , 40237 Düsseldorf , Germany
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Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Max Planck Institute for Sustainable Materials , 40237 Düsseldorf , Germany
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