High damping capacity and low density M2052/Al composites fabricated by accumulative roll bonding

Abstract

High damping capacity and low density M2052/Al composites were successfully fabricated using the accumulative roll bonding (ARB) method, by taking advantages of high damping capacity for M2052 alloy (Mn-20Cu-5Ni-2Fe, at%) particles and excellent mechanical properties and low density for Al matrix. The 15 wt% M2052 particles were uniformly dispersed in Al-matrix after 10 ARB process cycles. M2052/Al composites have a low density of 2.9 g/cm3, which is just a little higher than that of Al. After ARB process and a subsequent hydrogen annealing, the M2052/Al composites exhibit both high room temperature damping capacity and good mechanical properties: the highest damping capacity is 0.01 at 270 K, 5 times that of pure Al at the comparative temperature; the ultimate tensile strength is about 70 MPa (about 35% higher than that of pure Al), and the total elongation reaches 24%. The simultaneous enhancements on damping capacity and tensile strength of the M2052/Al composites can be attributed to the high damping capacity and the dispersion strengthening of M2052 phase, as well as the good bonding between the M2052 particles and Al matrix resulted from the ARB technique.