Consider a 6xxxseries aluminum alloy which has 1 wt Mg2 Si W

Consider a 6xxx-series aluminum alloy which has 1 wt% Mg_2 Si. Within 10 degree C, give the minimum and maximum possible temperatures at which solution treatment (aka solubilization) could be performed prior to age hardening. Give the wt% Mg and wt% Si that would have to be added to a pure aluminum melt to achieve this composition. (M_Mg = 24.305, M_si = 28.086)

Solution

T_MIN =500 ⁰C

T_MAX = 615 ⁰C

SUPPOSED 100GM ALLOY

1GM Mg₂SI HENCE 2MOLES OF MG FOR 1 MOLE OF SI

MASS BALANCE M_SI *n_si +M_mg *n_mg = 1

n_mg= 2n_si

on solving n_si= 0.013 mass of Mg= 0.365= wt% Mg

n_mg= 0.026 mass of Si = 0.632 =wt% of Si since taken per 100gm