This study aims to seek favorable T6 heat treatment criteria on the improvement of hardness, strength and ductility of aluminum alloy 7075. Sample parts were produced using gas induced semi-solid (GISS) technique and squeeze casting. Two significant factors in the process affecting these mechanical properties are temperature and time. Three solution temperatures were investigated: 450 ˚C, 480 ˚C and 510 ˚C at two durations of 4 h and 8 h, followed by a two-step artificial aging having the first stage conditions of 120 ˚C for 2 h, and the second stage of 170 ˚C for 1.5 h. The most favorable result was obtained from a solution treatment at 450 ˚C for 8 h, yielding a Rockwell hardness of more than 88 HRB, a yield strength of nearly 336 MPa, an ultimate tensile strength of close to 480 MPa, and an approx. 7% elongation (reported normal AA 7075 has a hardness of approx. 60 HRB, yield strength of approx. 135 MPa, and UTS of 210 MPa). However, results obtained from solution treatment at 8 h were not significantly lower to that conducted at 4 h, and hence solution treatment could well be cut in half.