SYMPOSIA PAPER Published: 01 January 1975

Fracture Behavior of Unidirectionally Solidified Ti-Ti Ge Eutectic Composites


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).

Author Information

Yue, AS
University of California, Los Angeles, Calif.
Kaba, BT
University of California, Los Angeles, Calif.
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Developed by Committee: D30
Pages: 504–514
DOI: 10.1520/STP32329S
ISBN-EB: 978-0-8031-4660-0
ISBN-13: 978-0-8031-0309-2