Combination of multioptical morphology, such as transmission, scattering, fluorescence (FL), and room-temperature phosphorescence (RTP), to build multisignal-integrated devices is highly attractive in future optical devices but extremely difficult owing to the poorly matched material design and construction principles. Here, we report a novel multioptical morphology elastomer (MOME) fabricated by encapsulating monodisperse RTP SiO2 nanoparticles (RTP-SiO2 NPs) with polydimethylsiloxane (PDMS). The switching behavior of optical signals is dependent on the deformation of MOME, such as stretching, bending, and squeezing. The MOME changes from a transparent state to a white scattered state under white light as the deformation increases, while the FL and RTP are significantly enhanced from the original weak state. During deformation, the air voids generated by the separation of RTP-SiO2 NPs and PDMS at the interface result in a refractive index mismatch, leading to a significant enhancement of light scattering and further causing deformation-induced self-scattering enhancement behavior in FL and RTP. Moreover, MOME also has intriguing modulation phenomena, such as dynamic deformation-regulated RTP during the decay process and solvent-deformation synergistically regulated optical switching behavior. On account of the outstanding optical properties, MOME is applied in daily visual monitoring of underwater pipelines, including displacement deviation, leakage, swelling, and localized anomalous protrusions. These findings provide important breakthroughs for the design of multioptical morphology integrated devices, demonstrating great potential for applications.
To overcome the strength-ductility conflict in particle reinforced aluminum matrix composites (PRAMCs), a novel dual configuration strategy of microstructure was proposed in this work. The dual configuration including both heterogeneous grain structure and hybrid reinforcements was obtained by powder metallurgy, which was designed as submicron-sized SiC particles (SiCsm)/Al and micron-sized SiC particles (SiCm)/2024Al components. Representative alternating coarse grain (CG) bands containing SiCm and ultra fine grain (UFG) bands with dispersed SiCsm were revealed in microstructural characterizations. Compared to corresponding homogeneous composites with the same fraction particles, the dual configuration composite achieved simultaneous enhancement in strength and ductility and remained a comparable Young’s modulus of 98GPa, which represented 442 MPa in yield strength, 590 MPa in ultimate strength and 8.7 % in fracture elongation. The extra strength provided by hetero-deformation induced (HDI) strengthening is a potential dominant strengthening mechanism. The intrinsic toughening mechanisms primarily contribute to HDI strain hardening and enhanced dislocation accumulation capacity, while the extrinsic toughening mechanisms presumably attribute to more uniform microcrack distribution and blunting effect of CG zones on cracks. Our work provides a feasible route including ball milling and powder assembly to preparate high-modulus aluminum matrix composites for strength-ductility balance design.
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