In this paper, high-entropy alloy (HEA) particle-reinforced magnesium matrix composites were successfully prepared by the spark plasma sintering (SPS) technology. The effect of the addition of HEA particles on the microstructural evolution, compressive properties and wear properties was investigated. Given its weak binding with other HEA elements, Cu was the element that separated in the initial HEA-reinforced material and combined with Mg to produce CuMg2 dispersed in the matrix. The microhardness of the SPSed composite was 45.9% higher than that of the magnesium matrix. The SPSed composite with HEA particle content of 15 vol.% had the best compressive strength, and the ultimate compressive strength reached 269 MPa. With increased AlCoCuFeNi particles, the matrix could avoid fatigue wear, and the abrasive wear mechanism dominated.
A highly sensitive dual-core photonic quasicrystal fiber methane sensor based on surface plasmon resonance is designed and analyzed. In this sensor, cryptophane
E
is doped with polysiloxane and Ag and used as the sensitive film and plasma medium, respectively, for sensitive detection of methane. The influence of the structural parameters on the sensor properties is analyzed by the finite element method. The optimized dual-quasi-D-shape structure has excellent methane-sensing properties such as maximum and average wavelength sensitivities of 14 and 10.98 nm/%, respectively, in the methane concentration range of 0%–3.5%. The sensitivity is better than that of similar sensors reported previously.
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