MECHANICAL INSTABILITY OF ALLOY TI-6AL-4V UNDER LARGE EXTENSIONAL VIBRATIONS.
COLUMBIA UNIV NEW YORK INST FOR THE STUDY OF FATIGUE AND RELIABILITY
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High amplitude internal friction measurements have been made on 7075 aluminum and the alloy Ti-6Al-4V. The aluminum shows the three dislocation phases present for most metals. This ends in fatigue at slightly higher strains than measured. The titanium alloy shows mechanical instability at strains from 1 to 0.003. This instability manifests itself in a sudden decrease in the elastic modulus and increase in the internal friction both to values as high as 0.2. Both effects will be deleterious for the uses of the alloy at strain amplitudes of the order of magnitude of 1 to 0.003. Author
- Metallurgy and Metallography