The Microstruture And Properties Of Accumulative Roll-bonding AA 1060

In recent years,ultrafine-grained(UFG)materials have aroused considerable interest due to their superior mechanical properties in terms of strength and ductility.Severe Plastic Deformation(SPD)technology is a principal route to produce UFG materials.During plenty of SPD technologies,Accumulative Roll-Bonding(ARB)becomes the most promising technology for industrial assembly line production.One of the advantages of ARB process in comparison to other SPD methods is that it is a continuous process which can be incorporated in industry to produce large scale UFG metallic sheets with unimportant modifications to the conventional rolling plant.In this study,the AA 1060 Aluminum Alloy was processed by ARB technique for 7 cycles in room temperature and 5 cycles in cryogenic temperature.The microstructure,texture and mechanical properties of ARB sheets during different ARB cycles and temperature were researched by Metallurgical Microscope,SEM,XRD,Universal Tensile Testing Machine and Vickers Indenter.The results show that: during the ARB process,the grain of AA 1060 sheets was elongated into lamellar structure though RD,and the grain size was gradually decreased with increased ARB cycles.The average hardness though the thickness of ARB sheets rapidly rose after the 1st cycle of ARB,and increased slowly with increased ARB cycles.With the increasing of ARB cycles,the tensile strength and yield strength of ARB sheets quickly increased,and then increased slowly.It was found that the tensile strength of 5-cycle ARB sheet in cryogenic temperature had been higher than 7-cycle ARB sheet in room temperature.The cube orientation in the surface layer of ARB sheets rotated to the r-cube orientation during the ARB process.The texture evolution of surface layer can be quantitatively demonstrated by the variation of the texture volume fractions with rolling true strain during ARB process.The volume fraction of the cube component decreased with increasing accumula ted true strain,whereas the volume fraction of the r-cube component increased.The texture in center layer of ARB sheets rotated to β fiber component with the increasing ARB cycles,and the intensity though the center line of β fiber component was strongly affected by the initial texture.