High-strength, ductility and modulus Al-Li/B4C composite with near nanostructure produced by accumulative roll bonding

摘要

Al-Li/B4C composite was produced by accumulative roll bonding (ARB) at ambient temperature. The agglomeration of B4C particles in the interfaces between Al-Li layers was evolved to the small clusters and uniform dispersoid particles in the matrix. Quite a few nano-grains were observed in the 8-cycles ARB processed Al-Li/B4C composite, indicating the successful preparation of near nanostructure. The strength and ductility were simultaneously improved with the increase of ARB cycles. The excellent mechanical properties (UTS = 384 MPa, YS = 264 MPa and EL = 10.7%) and high Young's modulus (87 GPa) were achieved after 8 cycles of ARB process. The high strength of 8-cycle ARB processed Al/B4C composite was related to grain refinement strengthening and dislocation strengthening. The pleasurable ductility of 8-cycle ARB processed Al-Li/B4C composite was attributed to the uniform distribution of B4C particles and proper wide grain size distribution. (C) 2020 Elsevier B.V. All rights reserved.