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An examination of delta prime growth in an aluminum-lithium alloy by X-ray diffraction

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Author
Whitman, Clark E.
Date
1990-03
Advisor
Fox, A.G.
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Abstract
A previously manufactured hot rolled sheet of A1-LiZr alloy of composition A1-2.5%Li-15%Zr, by weight, was solution treated and artificially aged at 194 C from C to 32 hours. X-ray diffraction analysis of the alloy was conducted to observe the growth characteristics of the delta prime precipitate (the precipitate hardening phase). Transmission electron microscopy was used to verify X-ray results. Significant superlattice intensity and line broadening occurred in the as-quenched sample. This observation supports a possible order/disorder reaction and a spinodal decomposition as opposed to the typical nucleation and precipitation reaction usually observed in a precipitation hardened alloy. The Scherrer equation was used to determine delta prime particle size from diffraction line broadening, and this size was found to coarsen following conventional Ostwald ripening theory once the initial effects of the spinodal had aged out. The delta phase (considered cause of low toughness) was observed in the as quenched sample and throughout the heat treatment. It was surmised that this may be the origin of he low-short transverse fracture toughness which is typical of some of these alloys.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/37555
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  • 1. Thesis and Dissertation Collection, all items
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