SiCf/SiC　composites　could　improve　the　operating　temperature　and　thrust-weight　ratio　of　aero-engines,　and　their　effective　joining　with　superalloys　can　solve　itself　problem　of　poor　machinability.　However,　large　residual　stress　in　the　brazed　joint　deteriorates　the　mechanical　performance.　Graphene-reinforced　Cu　(G-Cu)　foam　was　introduced　as　an　energy-absorbing　interlayer　to　relieve　the　residual　stress　in　this　study.　Graphene　played　a　“protective　clothing”　role,　and　G-Cu　foam　skeleton　was　less　prone　to　collapse　and　remained　intact,　and　had　a　more　durable　plastic　deformation　capacity.　By　using　FIB　and　TEM　to　accurately　observe　the　brazed　joint,　it　was　found　that　the　nano-sized　skeleton　was　not　interrupted　and　still　maintained　its　strong　foam　structure.　Introducing　G-Cu　foam　had　played　a　great　role　in　the　optimization　of　the　microstructure.　The　distribution　of　bulk　Cu(s,s)　became　more　uniform,　and　TiCu　was　uniformly　“protected”　around　Cu(s,s).　The　G-Cu　foam　had　the　low　coefficient　of　thermal　expansion　(CTE),　which　decreased　the　residual　stress　from　340　MPa　to　275　MPa.　The　G-Cu　foam　balanced　the　difference　in　elastic　modulus　between　base　materials,　and　the　brazed　joint　obtained　the　“ductility-rigidity-ductility”　multilayer　structure.　By　introducing　the　diversified　optimization　mechanism　of　energy-absorbing　interlayer,　the　synergistic　improvement　of　“microstructure-stress-performance”　was　realized,　and　joints　with　good　structure,　low　stress,　high　strength　and　high　toughness　were　obtained.　©　2023　Elsevier　Inc.