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Dynamic fragility of bulk metallic glass (BMG) of Zr64Cu16Ni10Al10 alloy is studied by three-point beam bending methods. The fragility parameter mfor Zr64Cu16Ni10Al10 BMG is calculated to be 24.5 at high temperature, which means that the liquid is a "strong" liquid, while to be 13.4 at low temperature which means that the liquid is a "super-strong" liquid. The dynamical behavior of Zr64Cu16Ni10Al10 BMG in the supercooled region undergoes a strong to super-strong transition. To our knowledge, it is the first time that a strong-to-superstrong transition is found in the metallic glass. Using small angle x-ray scattering experiments, we find that this transition is assumed to be related to a phase separation process in supercooled liquid. 相似文献
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采用大功率高重复频率准分子激光溅射热解石墨靶制备了类金刚石碳膜, 研究了实验条件对类金刚石膜光学性能的影响, 发现氢可以提高膜中sp3键的含量和膜的光学透过率. 在实验参数范围内, 膜的光学性能随着氢压的增加而提高. 根据类金刚石膜的反应沉积机理对上述结果进行了分析、解释. 相似文献
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利用有机溶剂溶胀磺化聚苯乙烯@二氧化钛(SPS@TiO2)核壳粒子制得二氧化钛/聚苯乙烯(TiO2/PS)双面神(Janus)颗粒,并在TiO2端进行改性,得到墨绿色的聚苯胺/聚苯乙烯(PANi/PS)Janus颗粒.用扫描电子显微镜(SEM)、电子能谱(EDS)、元素分析、透射电子显微镜(TEM)、红外光谱(IR)、热重分析(TGA)、固体紫外-可见分析(UV-Vis)和四探针法考察Janus颗粒组成、微结构和Janus性质.结果表明,Ja-nus颗粒为雪人状结构,PS端的平均粒径为228 nm,PANi端的平均粒径从TiO2的258 nm增大为295 nm;并且在EDS谱上可以观察到N元素,而未观察到Ti元素;包覆的PANi的质量分数为23.7%.掺杂后PANi/PS Janus颗粒的导电性能较好,电导率为0.247 S/cm. 相似文献
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采用大功率高重复频率准分子激光溅射热解石墨靶制备了类金刚石碳膜,研究了实验条件对类金刚石膜光学性能的影响,发现氢可以提高膜中sp3键的含量和膜的光学透过率.在实验参数范围内,膜的光学性能随着氢压的增加而提高.根据类金刚石膜的反应沉积机理对上述结果进行了分析、解释. 相似文献
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