研究了Ｔ６热处理前后喷射沉积Ａｌ－Ｓｉ－Ｆｅ－Ｃｕ－Ｍｇ合金的断裂行为。热处理消除了硅相尖角及硅相内应力，提高了硅相强度，使原来主要起源于硅相上的断裂裂纹，改变为起源于硅相上以及硅相与基体之间的结合处。热处理也使基体得到固溶强化，对裂纹的扩展起到了一定的抑制作用，提高了合金的强度 The fracture behavior of spray-deposited Al-Si-Fe-Cu-Mg alloy before and after T6 heat treatment was studied. The heat treatment eliminates sharp corners of the silicon phase and internal stress in the silicon phase, increases the strength of the silicon phase, and changes the rupture cracks originally originating in the silicon phase into bonds originating in the silicon phase and between the silicon phase and the substrate. The heat treatment also makes the matrix get solid solution strengthening, which can inhibit the expansion of the crack and improve the strength of the alloy