Low-cycle fatigue behavior of in situ TiB2/Cu composite prepared by reactive hot pressing |
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Authors: | S C Tjong G S Wang |
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Affiliation: | (1) Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong |
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Abstract: | Copper-based composite reinforced with in situ TiB2 particulates was prepared through reactive hot pressing of Ti, B and Cu powders. The formation of in situ TiB2 particulates was verified by the X-ray diffraction technique. Tensile test showed that fine TiB2 particulates were very effective to increase the tensile and yield strengths of copper at the expense of tensile ductility.
Strain-controlled low-cycle fatigue measurements demonstrated that the in situ TiB2/Cu composite exhibited essentially stable cyclic stress response behavior under small total strain amplitudes of 0.1–0.3%.
However, this composite exhibited slight cyclic hardening under strain amplitude of 0.4%. Such cyclic hardening was more pronounced
at a total strain amplitude to 0.6% due to the formation of dislocation cells and networks. Finally, the fatigue life data
of the in situ TiB2/Cu composite can be described by the Coffin–Manson equation. |
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