Abstract
In this work, a novel NiTif-SiCf synergistically reinforced (Al3Ti+Al3Ni)-based metallic-intermetallic laminated (NiTif-SiCf/(Al3Ti+Al3Ni)-MIL) composite was designed and synthesized using NiTi and SiC fibers, Ti and Al foils with the “Ti (TC4)-NiTif-Al-Ti (TA1)-Al-SiCf-Ti (TC4)” stacked unit by hot pressing sintering process in vacuum. The TA1 foils as barrier (Tib) are favorable to promote the consumption of Al, meanwhile, allow NiTif and SiCf to co-exist in one intermetallic layer. SEM, EDS, XRD and EBSD techniques were employed to investigate microstructure features, phase constituents and growth kinetics of the NiTif-SiCf/(Al3Ti+Al3Ni)-MIL composite. Besides, the mechanical performances of the composite were detected through compressive tests. The results showed that the newly formed phases in the composite consisted of Al3Ti, Al3Ti0.8V0.2 and Al3Ni, which were obtained from the reactions of Ti/Al and NiTif/Al, resulting in the generation of inhomogeneous intermetallic layer. In addition, NiTif and SiCf, lined up respectively, were distributed uniformly in one intermetallic layer along parallel orientation and the oval shaped eutectic areas were in-suit formed around NiTif by reaction of NiTif/Al. While Tib layers were disappeared between NiTif and SiCf due to the complete reaction of Tib/Al, and were replaced by Al3Ti and Al3Ni phases. However, the Al3Ti grains at this area grew abnormally by devouring the surrounding grains after recrystallization, which were harmful to the strength of the composite. Furthermore, the kinetic calculation results showed that the growth of NiTif/Al and Tib/Al interfacial layers are governed solely by chemical reaction mechanism at 630 °C. Moreover, the NiTif-SiCf/(Al3Ti+Al3Ni)-MIL composite acquired superior specific strength and ductility in both perpendicular and parallel directions, which were attributed to the pull-out and breakage of SiCf and NiTif, as well as crack deflection at interfaces.
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