Effect of Phase architecture on mechanical properties of interpenetrating metal/ceramic composites
The aim of this article is to compare the influence of the phase architecture on the mechanical properties of two interpenetrating MMCs with same metallic and ceramic phases and similar phase contents. One of the composites was fabricated by infiltrating freeze-cast alumina preforms, while the other composite was fabricated by infiltrating open porous alumina foam. Tests were carried out to determine the three longitudinal elastic constants, elastic-plastic flow behavior under compression and mechanism of internal load transfer under compression. Results show that phase morphology has a significant influence on the composite mechanical properties. Highest stiffness and compressive strengths are observed along the freezing direction in the freeze-cast MMC and this result from the significantly higher fraction of load carried by the alumina phase in this MMC type. Foam based MMC shows more isotropic behavior and its properties lie between the longitudinal and transverse properties for freeze-cast MMC.
Keywords:Interpenetrating MMC Freeze-casting Anisotropy Load transfer
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The authors thank T. Waschkies, R. Oberacker and M. J. Hoffmann at IAM-KM, Karlsruhe Institute of Technology for fabricating the freeze-cast preforms. Financial support from German Research Foundation (DFG) under grant number RO 4164/1-1 is thankfully acknowledged.
- 1.Chawla N, Chawla KK (2006) Metal matrix composites. Springer, New YorkGoogle Scholar
- 2.Clyne TW, Withers PJ (1993) An introduction to metal matrix composites. Cambridge university Press, CambridgeGoogle Scholar
- 3.Prielipp H, Knechtel M, Clausen N et al (1995) Strength and fracture toughness of aluminum/alumina composites with interpenetrating networks. Mater Sci Eng A 197: 19-30Google Scholar
- 4.Roy S, Wanner A (2008) Metal/ceramic composites from freeze-cast ceramic preforms: domain structure and elastic properties. Compos Sci Technol 68: 1136–1143Google Scholar
- 5.Roy S, Butz B, Wanner A (2010) Damage evolution and domain-level anisotropy in metal/ceramic composites exhibiting lamellar microstructures. Acta Mater 58: 2300-2312Google Scholar
- 6.Roy S, Gibmeier J, Kostov V, Weidenmann KA, Nagel A, Wanner A (2011) Internal load transfer in a metal matrix composite with a three dimensional interpenetrating structure. Acta Mater 59: 1424-1435Google Scholar
- 7.Roy S, Stoll O, Weidenmann KA, Nagel A, Wanner A (2011) Analysis of the elastic properties of an interpenetrating AlSi12-Al2O3 composite using ultrasound phase spectroscopy. Compos Sci Technol 71: 962-968Google Scholar
- 8.Wanner A (1998) Elastic modulus measurements of extremely porous ceramic materials by ultrasonic phase spectroscopy. Mater Sci Eng A248: 35-43Google Scholar
- 9.Roy S, Gebert J-M, Stasiuk G, Piat R, Weidenmann KA, Wanner A (2011) Complete determination of elastic moduli of interpenetrating metal/ceramic composites using ultrasonic techniques and micromechanical modelling. Mater Sci Eng A528: 8226-8235Google Scholar
- 10.Roy S, Gibmeier J, Wanner A (2009) In situ study of internal load transfer in a novel metal/ceramic composite exhibiting lamellar microstructure using energy dispersive synchrotron X-ray diffraction. Adv Eng mater 11: 471-477Google Scholar
- 11.Roy S, Gibmeier J, Kostov V, Weidenmann KA, Nagel A, Wanner A (2012) Internal load transfer and damage evolution in a 3d interpenetrating metal/ceramic composite. Mater Sci Eng A551: 272-279Google Scholar
- 12.Wanner A, Dunand DC (2000) Synchrotron X-ray study of bulk lattice strains in externally loaded Cu-Mo composites. Met Mater Trans 31A: 2949-2960Google Scholar