Abstract
Deformation and fracture of Saffil fiber (SF) reinforced Mg, Mg-8 wt.% Li and Mg-12 wt.% Li composites was monitored by means of in-situ scanning electron microscopy during 3-point bend tests. Mg and MgLi matrix composites (10 vol.% SF) were prepared by the melt infiltration technique. Poor interfacial bond causes premature failure of the SF/Mg composite that is usually triggered by the debonding of perpendicular fibers at the convex composite surface. Strong interfaces in SF/Mg12Li composite result in multiple cross-breakage of aligned fibers which is indicative of their participation in the composite strengthening. Resultant composite strengthening is frustrated by massive stress relaxation of the Mg12Li matrix. Strong interfaces and fairly high strength of the Mg8Li matrix cause remarkable strengthening of SF/Mg8Li composites. The cleavage of phases in two-phase Mg8Li matrix plays an insignificant role in the composite failure.
References
[1] S.Kúdela: Int. J. Mater. Prod. Techn.18 (2003) 91–115.10.1504/IJMPT.2003.003587Search in Google Scholar
[2] S.Kúdela, S.Oswald, S.KúdelaJr., S.Baunack, K.Wetzig: J. Alloys Comp.378 (2004) 127–131.10.1016/j.jallcom.2003.10.090Search in Google Scholar
[3] A.A.Nayeb-Hashemi, J.B.Clark, A.B.Pelton: Bull. Alloy Phase Diagrams5 (1984) 365–374.10.1007/BF02872951Search in Google Scholar
[4] K.Schemme: Entwicklung superleichter Magnesium-Werkstoffe, VDI-Vortschritt-Berichte Nr. 293/Reihe 5, VDI-Verlag GmbH, Düsseldorf (1993).Search in Google Scholar
[5] K.Wetzig, D.Schulze: In-situ Scanning Electron Microscopy in Materials Research, Akademie-Verlag, Berlin (1995).Search in Google Scholar
[6] T.W.Clyne, P.J.Withers: An Introduction to Metal Matrix Composites, Cambridge University Press (1995).10.1017/CBO9780511623080Search in Google Scholar
[7] M.E.Drits, F.M.Yelkin, I.I.Gurev, B.I.Bondarev, V.F.Trokhova, A.D.Sergievskaya, T.N.Osokina: Magnesium-Lithium Alloys, Metallurgia, Moscow (1980).Search in Google Scholar
[8] Y.Iwadate, M.Lassouani, F.Lantelme, M.Chemla: J. Appl. Electrochem.17 (1987) 385–397.10.1007/BF01023304Search in Google Scholar
[9] S.Kúdela, H.Wendrock, S.KúdelaJr., L.Ptáček, S.Menzel, K.Wetzig: Mater. Sci. Forum482 (2005) 355–358.10.4028/www.scientific.net/MSF.482.355Search in Google Scholar
[10] R.E.Lee, W.J.D.Jones, J. Mater. Sci.9 (1974) 469–473.10.1007/BF00737849Search in Google Scholar
[11] Z.Trojanová, S.Kúdela, P.Lukáč, Z.Drozd, K.Mathis, V.Kolenčiak, A.Schweighofer: Kovové materiály – Metallic Materials39 (2001) 1–10.Search in Google Scholar
[12] Z.Trojanová, S.Kúdela, P.Lukáč, Z.Drozd, L.Ptáček, K.Mathis: Kovové materiály – Metallic Materials41 (2003) 203–211.Search in Google Scholar
[13] Z.Trojanová, Z.Drozd, P.Lukáč, S.Kúdela: Mater. Sci. Forum419–422 (2003) 817–822.10.4028/www.scientific.net/MSF.419-422.817Search in Google Scholar
[14] Z.Drozd, Z.Trojanová, S.Kúdela: J. Alloys Comp.378 (2004) 192–195.10.1016/j.jallcom.2004.01.040Search in Google Scholar
[15] Z.Trojanová, Z.Drozd, S.Kúdela, Z.Száraz, P.Lukáč: Comp. Sci. Techn.67 (2007) 1965–1973.10.1016/j.compscitech.2006.10.007Search in Google Scholar
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