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Compared with traditional alloys, high-entropy alloys (HEAs) have excellent properties which attract more and more attention. Laser cladding is an easy way to fabricate HEA coatings on traditional structural materials. 3D printing technology is developed based on laser cladding technology. On this basis, HEA coating will meet the need of future development trend by 3D printing. In this work, 3D printing was used to prepare HEA (Al0.4CoNiCu0.6Ti0.25Si0.2) coating on the surface of three kinds of substrates (X70 steel, 2A12 alloy, ZM5 alloys). The phase structure, corrosion resistance and wear performance of HEA coatings were tested. Results as follows: the topography structure, composition and phase structure of the coatings are very different. The hardness of three coatings are 2A12 > ZM5 > X70. However, the corrosion resistance and wear performance are X70 > 2A12 > ZM5. [ABSTRACT FROM AUTHOR]

Latent fingerprints (LFPs) is one of the most important physical evidence in the criminal scene, playing an important role in forensic investigations. Therefore, developing highly sensitive and convenient materials for the visualization of LFPs is of great significance. We designed and synthesized an organic fluorescent molecule TP-PH with aggregation-induced enhanced emission (AIEE) activity. By simply soaking, blue fluorescent images with high contrast and resolution are readily developed on various surfaces including tinfoil, steel, glass and plastic. Remarkably, LFPs can be visualized within 5 min including the first-, second- and tertiary-level details. In addition, TP-PH exhibits interesting photoactivated fluorescence enhancement properties. Under irradiation of 365 nm UV light with a power density of 382 mW/cm2, the fluorescence quantum yield displays approximately 21.5-fold enhancement. Mechanism studies reveals that the photoactivated fluorescence is attributed to the irreversible cyclodehydrogenation reactions under UV irradiation. This work provides a guideline for the design of multifunctional AIEE fluorescent materials. [ABSTRACT FROM AUTHOR]