STP580: Fracture Behavior of Unidirectionally Solidified Ti-Ti5Ge3 Eutectic Composites

    Yue, AS
    Professor of engineering and applied science and graduate student, University of California, Los Angeles, Calif.

    Kaba, BT
    Professor of engineering and applied science and graduate student, University of California, Los Angeles, Calif.

    Pages: 11    Published: Jan 1975


    Abstract

    A titanium-21 weight percent germanium eutectic alloy was unidirectionally solidified at two different rates to produce a composite material strengthened by intermetallic Ti5Ge3 fibers. The higher solidification rate produced a composite with fibers of finer diameters. The fracture behavior of this material was determined from work of fracture and impact experiments. A brittle-to-ductile transition was found, through the work of fracture experiments, to be 1150°F (621 °C). This transition was raised by some 450°F (232°C) under impact loading. The large increase in the work of fracture corresponding to this transition has been attributed to the increased ductility of the titanium matrix. It was also found in this experiment that the composite with larger fiber diameters was tougher than that with smaller fiber diameters. Macroscopic and microscopic observation of the fracture surface revealed that failure occurred in a brittle fashion below 800°F (427°C) and by normal rupture between 800 and 1200°F (427 and 649°C).

    Keywords:

    composite materials, intermetallics, fibers, eutectics, solidification, fracturing, impact tests, transition temperature


    Paper ID: STP32329S

    Committee/Subcommittee: D30.02

    DOI: 10.1520/STP32329S


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