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The eutectic Ni(Cr)-TaC has been directionally solidified to yield a fibrous composite. The material was studied in strain-limited low-cycle fatigue at room temperature and 1000°C. The eutectic with brittle fibers and a ductile matrix was found to obey the Coffin-Manson law at both temperatures. The hysteresis behavior is explained and related to tensile deformation. Surface studies of highly polished cyclic-bend specimens revealed the fatigue crack nucleation and early growth characteristics. The data are compared to conventional materials, and the fatigue resistance is found to be essentially equivalent.
fatigue tests, eutectics, composite materials, solidification, life prediction, crack initiation, hysteresis
Metallurgist, General Electric Corporate Research and Development Center, Schenectady, N. Y.
Professor of Materials Engineering, Rensselaer Polytechnic Institute, Troy, N. Y.