An enriched continuum model for the design of a hierarchical composite
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Ductility (Earth science)
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Nanocrystalline material
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Large-sized Ti/Ti-Al microlaminated composite thin sheet with thickness of 0.12mm was prepared by high-powerful electron beam physical vapor deposition technology in laboratory.The composite and microstructure of were analyzed by XRD and SEM;samples before and after densification were evaluated with static tensile test under different temperatures.The results of experiments indicated that the prepared material with visible lamellar structure was composed of Ti and α2-Ti3Al and γ-TiAl phases and the mean grain size was about 100-300nm.The ductility of microlaminate composite has been increased compare to that of TiAl component,the sample after densification treatment has a higher tensile strength and a good characteristic of delayed fracture due to the crack bluting induced by micro-layer interfaces.
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Tensile testing
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Laminated Ti–Al composite sheets with different mesostructures have been fabricated through hot pressing. The influence of mesostructure on mechanical properties of the composite is investigated. The results indicate that with the increase of sintering temperature, different mesostructures of composite are obtained, that is, laminated Ti/Ti–Al composite, laminated Ti 3 Al/TiAl composite, and monolithic Ti 3 Al/TiAl composite. The mechanical properties tests reveal that laminated Ti/Ti–Al composite exhibits better comprehensive mechanical properties, including flexural strength, fracture toughness, and microhardness, than those of laminated Ti 3 Al/TiAl composite and monolithic Ti 3 Al/TiAl composite. The fracture analysis shows that the propagation route of crack is zigzag for Ti/Ti–Al composite, curving for laminated Ti 3 Al/TiAl composite, and approximately a straight line for monolithic Ti 3 Al/TiAl composite. The relevant strengthening and toughening mechanism of the composites is discussed.
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HNBR/short aramid fiber(DCAF)/fibrillar silicate(FS) composites were prepared by mechanical blending of in situ modified FS,DCAF and HNBR.The effects of the addition levels of DCAF and FS,and different lengths of DCAF on the structure and properties of the composites were investigated.The results showed that the moduli of the composites under both tension and compression conditions at small strain were increased by adding DCAF;the tensile properties and anisotropy of the composites could be improved when the length or addition levels of DCAF increased;the stress-strain behavior and compression modulus of the composites were improved significantly by adding FS.
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