Influence of Crystal Orientation on Friction Characteristics of Titanium Single Crystals in Vacuum
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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Friction experiments were conducted in vacuum 10exp -9 mm Hg with oriented single- crystal titanium rider specimens sliding on polycrystalline titanium disk specimens. Experiments were conducted at a surface speed of 2.28 centimeters per second and loads from 250 to 1000 grams. Two principal single-crystal orientations were examined, one with the primary prismatic slip plane 1010 oriented parallel to the sliding interface and the other with the basal plane 0001 oriented in this same direction. The friction coefficient for titanium single crystals was less with the prismatic slip plane primary slip plane for titanium oriented parallel to the direction of sliding than with the basal slip plane oriented in this direction. These results correlate with the shear stress data for the respective orientations. Recrystallization and texturing occurred at high loads on the single-crystal surface, and friction values were the same as for polycrystalline titanium.
- Metallurgy and Metallography