Describe and explain the different stages in the heat treatm

Describe and explain the different stages in the heat treatment of an age hardenable aluminium-copper alloy. Give an example of the composition of one such alloy.

Solution

solution:

there are two stages in the heat treatment of hardenable aluminium copper alloy.

1) solution heat treatment

- during solution heat treatment all solute atoms are dissolved to form a single phase solid solution quenching or rapid cooling to room temperature to form a nonequalibrium supersatuated solid solution ( to prevent diffusion and the accompanying formation of any second phase )

2) Ageing

- The supersatuated solid solution is heated t an intermediate temperature within the two phase region at this temperature diffusion rates become appreciable. the precipitates of the second phase form as finely dispersed particles.