Explain age Hardening process used to strengthen an aluminium alloy .pdf

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Precipitation hardening, or age hardening, is used to strengthen aluminum alloys by forming uniformly dispersed second-phase particles within the alloy's matrix that act as obstacles to dislocation movement. The process involves solution heat treating the alloy to dissolve precipitates, quenching it to retain the solute in solid solution, and then aging it to nucleate and grow precipitate particles within the matrix that increase the alloy's strength and hardness.

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Explain age Hardening process used to strengthen an aluminium alloy diving cylinder
Solution
Precipitation hardening, or age hardening, provides one of the most widely used mechanisms for
the strengthening of metal alloys. The fundamental understanding and basis for this technique
was established in early work at the U. S. Bureau of Standards on Duralumin.
The strength and hardness of some metal alloys may be enhanced by the formation of extremely
small uniformly dispersed second-phase particles within the original phase matrix in a process
known as precipitation or age hardening. The precipitate particles act as obstacles to dislocation
movement and thereby strengthen the heat-treated alloys. Many aluminum based alloys, copper-
tin, certain steels, nickel based super-alloys and titanium alloys can be strengthened by age
hardening processes.
The precipitation-hardening process involves three basic steps:
1)

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