By John K. Tien
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Extra resources for Alloy and Microstructural Design
Since mechanical working is involved in the fabrication of most types of dispersion-strengthened alloys, these alloys are produced in a strainhardened state and a high density of dislocations is normally present in them. A portion of this dislocation substructure is believed to be stabi lized by the particles and to be present even at the highest temperature of application. Thus, the yield stress in such alloys is determined by a superposition of substructure and dispersion hardening and can be af fected by either thermal or thermomechanical treatment.
10. D i s l o c a t i o n - p r e c i p i t a t e interactions i n h i g h - v o l u m e - f r a c t i o n alloy (—40 vol % ) . (a), (b) Precipitate shearing, (c) precipitate l o o p i n g . cations through an alloy with a large volume fraction of precipitates than one with a small volume fraction of precipitates, because in the former case more APB per unit length must be produced by the leading dislocation. For a specific particle size, it can also be seen that the stress required for particle looping increases with increasing volume percent.
These sequences have been studied in most binary alloys of interest and have been summarized by Kelly and Nicholson (1963) and Brown and Ham (1971). Most commercially important wrought Al alloys are based on ternary or quaternary systems, A l - M g - C u , A l - M g - Z n , A l - M g - Z n - C u , and Al-Mg-Si being the most prevalent. , one where the precipitate composition does not include the base element. The details of the metallurgy of the ternary and quaternary alloys have been discussed by Speidel and Hyatt (1972).
Alloy and Microstructural Design by John K. Tien