Abstract
An innovative, high-strength metal–intermetallic-laminate (MIL) composite Ti-(SiCf/Al3Ti), reinforced by double or even several SiC fiber rows, was fabricated. A high-efficiency, semi-analytical model with a numerical equivalent inclusion method (NEIM) was employed to investigate the deformation behaviors, microscopic strengthening, and failure mechanisms of the composite during elasto-plastic sphere–plane contact. The microstructure and interface features were characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The contact model for the Ti-(SiCf/Al3Ti) composite was validated via quasi-static compressive indentation tests with a spherical indenter. A series of in-depth parametric studies were conducted to quantify the effect of the microstructure. The results indicate that the as-fabricated laminated composite has a well-organized microstructure and a higher volume fraction of fibers. The SiC fiber rows effectively enhance the strength and toughness of the composite. The optimal diameter of the SiC fibers is 32 μm when the horizontal center distance between the adjacent fibers is 2.5 times that of the fiber diameter. The hole defects occurring above the fibers would damage the material strength most compared with those occurring in other positions. The optimal quantity of the SiC fiber rows is four when the thickness of the SiCf/Al3Ti layer is 400 μm and the fiber diameter is 8 μm.
Highlights
In the mid-1990s, it was discovered that the superior mechanical performance of a shell is closely related to its special ductile–brittle laminated structure
Tests showed that the abovementioned laminated composite possesses a fivefold fracture toughness compared with the intermetallic compound Al3 Ti, and its superior properties, such as low density, high strength, and stiffness, meet the performance demands for the structural components of an aircraft engine
Figure1111is the is the microscopic morphology of the as-fabricated f/Al3Ti)-laminated
Summary
In the mid-1990s, it was discovered that the superior mechanical performance of a shell is closely related to its special ductile–brittle laminated structure. In the light of this, a novel Ti-Al3 Ti composite, which is a metal–intermetallic-laminated composite (MIL) with laminated components of ductile metallic titanium (Ti) layers and brittle intermetallic Al3 Ti layers, was devised by researchers [1,2,3]. Tests showed that the abovementioned laminated composite possesses a fivefold fracture toughness compared with the intermetallic compound Al3 Ti, and its superior properties, such as low density, high strength, and stiffness, meet the performance demands for the structural components of an aircraft engine. The developed strengthening and toughening methods for MIL composites include layer reinforcement, and extend to particle [5] and fiber [6] reinforcement techniques, by which the room-temperature plasticity of the intermetallic compound is improved to some extent.
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