Formation condition of high-entropy alloys with solid solution structure was investigated. Seventeen kinds of the high-entropy alloys with different components were prepared, the influencing factors （the comprehensiv...
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Formation condition of high-entropy alloys with solid solution structure was investigated. Seventeen kinds of the high-entropy alloys with different components were prepared, the influencing factors （the comprehensive atomic radius difference δ, the mixing enthalpy AH and the mixing entropy AS） of phase composition of the alloys were calculated, and the microstructure and phase compositions of alloys were analyzed by using SEM and XRD. The result shows that only the systems with δ≤2.77 and △H≥-8.8 kJ/mol will form high entropy alloy with simple solid solution. Otherwise, intermetallic compounds will exist in the alloys. So, selection of the type of element has important effects on microstructure and properties of high entropy alloys.
具有催化能力的微纳米马达在生物医学、物质运输与释放、环境检测等领域具有广阔的应用前景。目前可通过电化学沉积、超分子组装、金属溅射沉积等方法制备各种马达,但其尺寸很难扩展到100 nm以下,因此,发展100nm以下纳米马达将极大地扩展微纳米马达的应用范围。本文通过金属溅射的方法在介孔硅粒子表面上沉积铂,制备成Janus结构的粒子(Fig.1 a inset)。将这些Janus介孔二氧化硅粒子放入
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