Processability and High Temperature Behavior of Emerging Aerospace Alloys
Annual rept. no. 2, 1 May 1987-30 Apr 1988
ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER
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Part I of this program examines a unified approach for understanding and assessing microstructure changes under the influence of different modes of thermomechanical and deformation processing. Experimental validation of the microstructure changes occurring in advanced aluminum alloys, such as SiC particulate reinforced aluminum, high strength PM aluminum and high temperature aluminum alloy, AI-8Fe-4Ce, are being conducted. Progress of microstructural refinement and changes in misorientation between subgrains are determined to delineate the path for optimum processability for these alloys. The effects of various processing conditions on texture and elevated temperature deformation characteristics have been studied. Part II of the program is a study of the effects of Fe, C, O, and Si as minor additions and Nb and V as major additions of Ti-22AI-8Nb on 675 C creep behavior. The results have demonstrated that the effects of the individual additives on creep resistance for the Ti3AI base alloy are essentially the same as those previously observed for conventional titanium alloys. Si and Si Zr are effective for improving creep resistance of the alpha-two alloys by pinning mobile dislocations during creep exposure.
- Properties of Metals and Alloys