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Cellular energy absorbing TRIP-steel/Mg-PSZ composite: Honeycomb structures fabricated by a new extrusion powder technology

: Martin, U.; Ehinger, D.; Krüger, L.; Martin, S.; Mottitschka, T.; Weigelt, C.; Aneziris, C.G.; Herrmann, M.

Fulltext ()

Advances in materials science and engineering. Online journal (2010), Art. 269537, 6 pp.
ISSN: 1687-8442
ISSN: 1687-8434
Journal Article, Electronic Publication
Fraunhofer IKTS ()

Lightweight linear cellular composite materials on basis of austenite stainless TRIP- (TRansformation Induced Plasticity-) steel as matrix with reinforcements of MgO partially stabilized zirconia (Mg-PSZ) are described. Two-dimensional cellular materials for structural applications are conventionally produced by sheet expansion or corrugation processes. The presented composites are fabricated by amodified ceramic extrusion powder technology. Characterization of the microstructure in as-received and deformed conditions was carried out by optical and scanning electron microscopy.Magnetic balance measurements and electron backscatter diffraction (EBSD) were used to identify the deformation-induced martensite evolution in the cell wall material. The honeycomb composite samples exhibit an incr eased strain hardening up to a certain engineering compressive strain and an extraordinary high specific energy absorption per unit mass and unit volume, respectively. Based on improved property-to-weight ratio such linear cellular structures will be of interest as crash absorbers or stiffened core materials for aerospace, railway, or automotive applications.