“…Furthermore, the CTEs for the three samples increase at first, which is also related to the dissolution of the β or β” phase, which mainly contains Mg and Si due to the positive contribution of Mg to CTE and a 0 of α-Al solution [31,36,37]. During the cooling process after FSP, the shrinkage degree of base metal was larger than that of the reinforced particles, because the CTE of added particles is less than that of the aluminum matrix alloy, resulting in compressive stress in both the base metal and the added particles [38]. It is understood that the initial CTE of S300 and S700 is lower, and the CTE increment in the beginning stage is higher compared with S000 (Figure 3).…”