| Title |
Effects of the Stacking Layer Number on Microstructure and Mechanical Properties in ARB Process |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Accumulative roll-bonding; ARB; Pure aluminum; Ultrafine grain; Mechanical property; Shear strain |
| Abstract |
Effects of the stacking layer number(two and six) on microstructure and mechanical property of a ARB-processed commercially pure aluminum were studied. Two-layer stack ARB was performed up to eight cycles at ambient temperature without lubricant according to the conventional procedure. For six-layer stack ARB, the six aluminum sheets 0.5 mm thick were degreased and wire-brushed. The sheets were first stacked together and roll-bonded by 50%-reduction rolling, followed by four-pass rolling so that the final thickness was 0.5 mm. The sheet was then cut to the six pieces of same length and the same procedure was repeated up to six cycles. The tensile strength increased with actual equivalent strain up to a strain of ~5 at the same increasing rate in both two-layer and six-layer ARB, however above a strain of ~5 it was larger in two-layer stack ARBed sample than in six-layer stack ARBed one. The grain formed by the two-layer stack ARB was finer than that by the two-layer stack ARB. The effects of the layers in stacking were explained by the redundant shear deformation. |