The strengthening of age hardening Cu-Ti alloys derives from preprecipitation processes involving periodic, coherent clustering of Ti atoms within the supersaturated solid solutions and the formation of modulated microstructures during aging. The objective of this study has been to study in detail the development of the modulated microstructures characteristic of these "side-band" alloys and to correlate the mechanical properties with salient microstructurai parameters. The structure and properties are being characterized primarily using electron transmission microscopy and electron diffraction and through mechanical testing of single crystals and polcrystalline samples. The variation of the yield stress with temperature and the workhardening behavior of age hardened alloys are being carefully investigated. Also, the effect of prior deformation on the aging reactions is being investigated. These studies are to be extended to ternary Cu-Ni-Ti alloys.
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