Question

(20) Aluminum alloy (6061) (Al with 0.6 wt% Si and 1.0 wt% Mg) is subjected to age hardening 3. treatment. (a) (8) Plot the temperature versus time of the heat treatment process with reference to the psedo-binary phase diagram below. Indicate the different heat treatment steps on your graph 600 595°C 1.85% E400 aMgS 200 A1 1 16 2 wt% MgSi 12) Please make a sketch of the hardness as a function of annealing time (precipitation treatment) and explain why does the hardness increase and/or decrease over time?

Answer 1

6o6 Aluminium Al ot phae) CX clustvi S.li^ Solution hai tveatnsnt heat teatmanh me

incrasira time tt« Strength hndn increa) reaches maximum and nalldim shb ме Gi Sha^ disfoatin