Develop Ultrafine Grain Size Titanum with Improved Mechanical Properties.
FRANKLIN INST RESEARCH LABS PHILADELPHIA PA
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Tear, notched tensile, and fatigue crack propagation tests were used to assess the resistance of titanium material to toughness reduction in methanol-chloride and aqueous-chloride environments. Material variables included grain size, texture, cold work, interstitial content, and substitutional alloying. Unalloyed material, recrystallized to an ultrafine grain size, showed better resistance to degradation by the environments than Ti-5Al-2.5Sn and Ti-6Al-4V alloys. A scanning electron microscopy study of the fracture surfaces of tear specimens revealed the presence of mechanical texturing. Experiments directed toward the production of ultrafine grain size titanium by reactive hot pressing of titanium hydride powder were conducted. Author
- Metallurgy and Metallography