Structured Design and Residual Stress for Ni/Ni3Al Multi-Layered Sheet

Xiao, Yong; Hu, Zhao; Gao, Hong; Li, Ji Min

doi:10.4028/scientific5/amr.457-458.118

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“…In particular, through the bionic design, the metal-intermetallic laminated (MIL) composites were successfully fabricated. The metal layer of ductile Ti in an MIL composite was employed as a reinforcement to strengthen the toughness of the whole material [ 12 , 13 , 14 ]. This bionic design uses the energy dissipation principle and aims to minimize the impact of crack initiation on mechanic performances of the composite material [ 15 ].…”

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confidence: 99%

Elasto-Plastic Mechanical Properties and Failure Mechanism of Innovative Ti-(SiCf/Al3Ti) Laminated Composites for Sphere-Plane Contact at the Early Stage of Penetration Process

et al. 2018

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A novel silicon carbide (SiC) continuous ceramic fiber-reinforced (CCFR) Ti/Al3Ti Metal-Intermetallic-Laminate (MIL) composite was fabricated. A high-efficiency semi-analytical model was proposed based on the numerical equivalent inclusion method (NEIM) for analyzing the small-strain elasto-plastic contact in the early stage of the penetration process. The microstructure and interface features were characterized by the scanning electron microscopy (SEM). Quasi-static compression tests were performed to determine the contact response and validate the proposed model. A group of in-depth parametric studies were carried out to quantify the influence of the microstructure. The comparison between results under the sphere-plane and plane-plane contact load indicates that, under the first sphere-plane, the compressive strength and failure strain are both lower and the SiC reinforcement effect on strength is very clear while the effect on ductility is not clear. The maximum plastic strain concentration (MPSC) in the Al3Ti layer is closest to the upper boundary of the central SiC fiber and then extends along the depth direction as the load increases, which are also the locations where cracks may initiate and extend. Moreover, the CCFR-MIL composite shows better mechanical properties when the center distance between adjacent SiC fibers is four times the fiber diameter and the volume fraction of Ti is 40%.

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