To delve into the underlying chemical mechanisms governing the impact of aluminum on grain boundary (GB) sliding, we utilized Crystal Orbital Hamilton Population (COHP) analysis, facilitated by the Local-Orbital Basis Suite Towards Electronic Structure Reconstruction (LOBSTER) code. This analytical approach provides insights into the atomic bonding interactions within a given structure, with particular emphasis on the quantification of bond strength through Integrated COHP (ICOHP) values. A higher ICOHP value signifies a stronger bond. In the absence of aluminum, the sole bonds present in the GB are Si-Si bonds, which exhibit an ICOHP value of 4.380. However, when aluminum is introduced at the GB, the landscape shifts. Some Si-Si bonds are supplanted by Al-Si bonds, characterized by an ICOHP value of 3.774, indicative of weaker binding. Furthermore, the bonding states for Si-Si are comparatively higher than the bonding states of Al-Si (refer the green area in Figure ). This contrast highlights the weaker nature of Al-Si bonds in comparison to their Si-Si counterparts. Consequently, this disparity in bond strength facilitates more facile bond reconstructions during GB sliding, a phenomenon akin to a lubricating effect induced from the presence of aluminum.