Friction, Wear, and Adhesion Characteristics of Titanium-Aluminum Alloys in Vacuum
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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Friction, wear, and adhesion measurements were made in vacuum of titanium-aluminum alloys containing 11, 16, and 21 weight percent aluminum. Experiments were conducted with a 316 inch radius rider sliding on the flat surface of a 2.5 inch diameter disk specimen at loads to 1500 grams. The disk was rotated to produce sliding velocities to 750 centimeters per second. With increasing addition of aluminum to titanium, an increase in lattice ratio for titanium occurred along with a decrease in friction, wear, and adhesion. The increases in lattice ratio with the addition of aluminum to titanium occurred even though the unit cell size decreased these results are unlike those with the addition of tin and oxygen to alloys exhibited adhesion characteristics which could be considered negligible. These alloys exhibited superior friction and wear properties in vacuum compared with 52100 and 440-C stainless steels. Experiments were conducted with the alloys sliding on themselves and on 440-C stainless steel. Friction was less for the alloys sliding on 440-C stainless than when sliding on themselves.
- Properties of Metals and Alloys