Fabrication of ultrafine-grained AA1060 sheets via accumulative roll bonding with subsequent cryorolling

累积叠轧和深冷轧制复合工艺制备超细晶1060铝合金带材

Ultrafine-grained(UFG)AA1060 sheets were fabricated via five-cycle accumulative roll bonding(ARB)and subsequent three-pass cold rolling(298 K),or cryorolling(83 K and 173 K).Microstructures of the aluminum samples were examined via transmission electron microscopy,and their mechanical properties were measured via tensile and microhardness testing.Results indicate that ultrafine grains in ARB-processed sheets were further refined by subsequent rolling,and the grain size became finer with reducing rolling temperature.The mean grain size of 666 nm in the sheets subjected to ARB was refined to 346 or 266 nm,respectively,via subsequent cold rolling or cryorolling(83 K).Subsequent cryorolling resulted in ultrafine-grained sheets of higher strength and ductility than those of the sheets subjected to cold rolling.

采用5道次累积叠轧制备超细晶粒1060铝合金带材,并对材料分别进行三道次冷轧(298 K)、深冷轧制(轧制温度为83K和173K)。采用透射电子显微镜检查样品的显微组织,并通过拉伸试验和显微硬度试验测量材料的力学性能。结果表明,在随后的轧制过程中,累积叠轧带材的晶粒尺寸进一步细化,并且随着轧制温度的降低,晶粒尺寸变得更细。深冷轧制(83 K)后带材的晶粒尺寸从累积叠轧样品的666 nm细化至266 nm,这比经过随后冷轧(346 nm)的晶粒尺寸更加细小。同时,与冷轧相比,随后的深冷轧制使超细晶带材具有更高的强度和延展性。