In-situ investigation of deformation behavior and fracture mechanism of laminated Al/Ti composites fabricated by hot rolling

In this work, laminated Al/Ti composites were fabricated by hot rolling at three different temperatures (400 degrees C, 450 degrees C and 500 degrees C). The deformation behavior and fracture mechanism of composites were studied by the in-situ tensile test. The results indicated that the ductile shear fracture (for 400 degrees C and 450 degrees C rolled specimens) and ductile delamination fracture (for 500 degrees C rolled specimen) were the main fracture failure modes of Al/Ti multilayers. Results shown that the tensile load and displacement of the 500 degrees C prepared Al/Ti were better than other samples due to the higher rolling temperature. The changes of slip lines and plastic bands were the main plastic deformation characteristics for the Al layer and Ti layer metals, respectively. The investigation found that the major crack nucleation type in Ti layer was fold belt cracking. The slip bands cracking, cross-slip cracking, particle interface cracking and grain boundary slide cracking were the primary crack nucleation patterns for the Al layer. (C) 2018 Elsevier B.V. All rights reserved.