Abstract
Production process of titanium and aluminum joint reinforced by nickel coated carbon fiber (Ti/NiCF/Al) has been successfully developed. Although the discontinuous stress relaxation always occurred at 100±20 MPa in the stress-strain curves of fiber free Ti/Al joints, a smooth stress-strain curve was observed in the aluminum rod of the Ti/NiCF/Al joint. The fracture toughness, which was evaluated by the integrated area of the stress-strain curve of the Ti/NiCF/Al joint which underwent ductile fracture at the Al side rod, was more than two times larger than that of the fiber free joint which fractured near the joint interface. Since the nickel coated layer prevented the reaction between carbon fiber and molten metals, it mainly prevented generation of fracture near the Ti/Al joint interface. The Ti/NiCF/Al joint exhibited the high values of stiffness (dσ/dε), fracture strain and strain at tensile strength. These improvements were explained by both fining the metallic compounds and solution hardening by nickel addition, as well as the broad interface area of fine carbon fibers.
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