Abstract
This chapter describes the metallurgy of wrought, precipitation hardenable aluminum alloys used in airframe structures. Their composition–processing–microstructure–properties relationships and the ability or lack thereof to modeling these are used as the framework for the discussion. Alloying elements are added to aluminum for two reasons, namely precipitation hardening and control of matrix microstructure. The individual and combined effects of these sets of alloying elements and the impurities that are always present on the microstructure and properties are discussed in detail. This is followed by a review of the overall behavior of the various classes of aluminum alloys and those of specific alloys used commercially. The chapter concludes with a discussion of the status and possible directions for new alloy design and approaches to their insertion.
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