Abstract
Abstract : The objectives of this research were to identify the mechanisms for the large difference in ductility between the near peak aged AF/C-489 and AF/C-458 and then develop an aging schedule to optimize the microstructure for high strength and ductility. Duplex aging treatments produced significant increases in ductility for AF/C-489, approaching that of AF/C-458. Although strain localization occurred in both alloys it was more severe in AF/C-489 due to the higher volume fraction of shearable delta prime and a much larger grain size. Our results show that a significant increase in ductility of the higher lithium AF/C-489 can be obtained by double aging and reducing the grain size. The report describes the details of the study and the optimum processing to obtain this goal.
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