Microstructure of multilayer interface in an Al matrix composite reinforced by TiNi fiber |
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Affiliation: | 1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Reymonta Street 25, 30-059 Kraków, Poland;2. High Energy Technologies Works ‘Explomet’, Oswiecimska Street 100H, 45-641 Opole, Poland;3. Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany |
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Abstract: | A multilayer interface was formed in the Al matrix composite which was reinforced by 30% volume fraction of TiNi fiber. The composite was fabricated by pressure infiltration process and the interface between the TiNi fiber and Al matrix was investigated by transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). When the TiNi fiber was pre-oxidized in the air at 773 K for 1 h, three layers have been found and characterized in the interface: TiNi–B2 layer near the TiNi fiber, Ti–Al compound layer with Ti and granular TiO2 near the Al matrix, and Ti–Ni compound layer between TiNi–B2 and Ti–Al compound layers. The effect of the multilayer interface on the mechanical properties of the composite was also discussed. The result showed that the uniaxial tensile strength of the composite at room temperature was 318 MPa, which was very close to the theoretical calculation value of 326 MPa. Moreover, the composite with good ductility exhibited a typical ductile-fracture pattern. |
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Keywords: | Al matrix composite TiNi alloy Interface layer Microstructure TEM |
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