【摘要】 采用内氧化-热压烧结工艺制备了Al₂O₃-Cu/45W和0.3GO/Al₂O₃-Cu/45W两种复合材料，在变形温度为600～950℃,应变速率为0.001～10 s^-1的条件下，采用热模拟试验机对复合材料进行了高温热压缩试验，研究了其高温变形行为并构建了热加工图。结果表明：Al₂O₃-Cu/45W和0.3GO/Al₂O₃-Cu/45W复合材料的再结晶激活能分别为215.345和231.555 kJ/mol,最佳加工范围分别为780～950℃、0.016～0.905 s^-1和640～950℃、0.014～0.989 s^-1,氧化石墨烯（GO）的引入有效拓宽了复合材料的最佳热加工区间；透射电镜（TEM）结果表明，纳米Al₂O₃颗粒通过钉扎位错运动有效提升了复合材料的强度，同时还原氧化石墨烯（rGO）的存在改善了界面润湿性，从而进一步提升了其综合性能。更多还原

【Abstract】 Al₂O₃-Cu/45W and 0.3GO/Al₂O₃-Cu/45W composites were prepared using the internal oxidation hot-pressing sintering process. At deformation temperature of 600-950 ℃ and strain rate of 0.001-10 s^-1, high-temperature hot compression tests were conducted on the composites using a thermal simulation testing machine, and their high-temperature deformation behavior was studied and a hot processing map was constructed. The results show that the recrystallization activation energies of the Al₂O₃-Cu/45W and 0.3GO/Al₂O₃-Cu/45W composites are 215.345 kJ/mol and 231.555 kJ/mol, respectively, and their optimal processing ranges are 780-950 ℃, 0.016-0.905 s^-1; and 640-950 ℃, 0.014-0.989 s^-1, respectively. The addition of graphene oxide（GO） effectively expands the optimal hot processing range of the composites. Transmission electron microscopy（TEM） results show that the nano-Al₂O₃ particles effectively enhance the strength of the composites by pinning dislocation motion, while the presence of reduced graphene oxide（rGO） improves the interfacial wettability, thereby further enhancing the overall performance of the composites.更多还原