Investigation of Basic Creep Mechanisms of Titanium Alloys.
Final rept. 31 Mar 72-30 Jun 73,
ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CALIF SCIENCE CENTER
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High temperature creep resistance of Ti-Zr-Si alloys was studied with the objective of identifying rate controlling creep mechanisms. To achieve this objective, microstructures were systematically altered by changing the Si distribution in a manner designed to suppress a specific creep mechanism. For each microstructure, the apparent activation energy and area was determined, together with the extent of grain boundary sliding. Results from this study have shown that the predominate creep strengthening mechanism at 538C 1000F for Si bearing Ti alloys is a clustering of solute atoms on mobile dislocations. Direct evidence for this has been obtained by transmission electron microscopy. Modified author abstract
- Properties of Metals and Alloys