This research emphases the impact of solution annealing (post weld heat treatment) on the ultimate tensile strength (UTS) and weld nugget hardness (WNH) characteristics of friction stir welded joints of AA6082/3 wt.% ZrO2/5 wt.% B4C aluminium matrix hybrid composites (AMMHCs). The friction stirs welding (FSW) joints underwent solution annealing followed by numerous ageing treatments. Solution annealing is conducted at 450 °C in the AMMHCs, which are FSW with the low (28.55 kJ/mm), high (114.23 kJ/mm) heat input conditions, and optimum FSW process parameters (57.83 kJ/mm) (OHI) heat input conditions. The soaking period is conducted for 60 minutes and subsequently quenching by water and artificial ageing conducted at 120 °C for a soaking duration of 1 day. Solution annealing significantly influences grain growth, phase transformation, and the alteration of microstructures within various regions of the weldment, including the welded nugget zone (WNZ), thermo-mechanically affected zone (TMAZ), heat-affected zone (HAZ), and base metal (BM). Furthermore, understanding these microstructural changes aids in enhancing mechanical properties such as UTS and WNH. The UTS and WNH seemed to be increased at 450 oC. The FSW joints attained with FSW process parameters heat input conditions produced the fine grains and maximum UTS of 248 MPa and microhardness of 118 HV after solution annealing at 450 °C.

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