科研之友
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摘要
Different architectures of layered laminates comprising two exterior layers of Al-Mg-Si/SiC metal matrix composite and an A11050 ductile interlayer were fabricated by means of hot roll -bonding with applying different strains of epsilon(r) = 39%, 51%, and 63%. For monolithics production, ceramic particulate reinforcement contents of 0, 5, 10, and 15 vol% were utilized. The aim of introducing ductile metal interlayer was to compensate the low toughness of composite layers and consequently enhancement of damage tolerance of bundled structures along with prevention of their catastrophic failure through activation of extrinsic toughening mechanism. Effects of architectural characteristics and fabrication routes on toughness and fracture behavior of materials were studied by mechanical examinations including three-point bending (3PB) and shear tests. Fracture surfaces of 3PB examination were studied by SEM while associated mechanisms and correlations with debonded area (delamination), deformability, and SiC content were disclosed and discussed. Different analyses by deriving sigma(m) were performed and the role of reinforcement content, lamination and epsilon(r) were defined. Deformability of fabricated materials by identifying e(t), e(i), and e(p) parameters were discussed. Based on results, et trend was obeyed e(p) rather than ei due to more e(p) contribution in materials' total ductility. Toughness change by accounting initiation and propagation values were surveyed considering the combined effects of am, elongation, and stress-bearing capacity. Eventually, it was inferred that toughness was strongly controlled by elongation alteration. In addition, the contribution of propagation was more highlighted rather than initiation for laminates. Based on fracture surfaces, in monolithic samples, fracture morphology associated with SiC concentration. Fracture morphology of exterior composite layers had not been affected by er in laminates; since interlayer fracture was strongly influenced by rolling. This was due to distinct involved failure mechanisms. A11050 deformability was governed by delamination length as an indication of constraint level. Interfacial strength which acquired by shear test revealed that composite laminates had not been influenced by er due to the weak bondings of layers beside presence of SiC particles; however, aluminum laminates showed enhanced shear strength.
- 出版日期2017-9-15
