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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Thermophysical properties of Ni-Nb and Ni-Nb-Sn bulk metallic glass-forming melts by containerless electrostatic levitation processing
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Thermophysical properties of Ni-Nb and Ni-Nb-Sn bulk metallic glass-forming melts by containerless electrostatic levitation processing

机译：Ni-Nb和Ni-Nb-Sn块状金属玻璃熔体的无熔静电悬浮法的热物理性质

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摘要

The containerless high-temperature high vacuum electrostatic levitation (ESL) technique was used for the determination of thermo-physical properties of the binary eutectic alloy, Ni59.5Nb40.5, and the ternary alloy Ni60Nb34.8Sn5.2. The thermo-physical properties measured were density, specific heat over hemispherical total emissivity, surface tension and viscosity. The density for both the melts was found to be higher than that predicted by the rule of mixtures. This was attributed to strong attractive interaction between the constituents. The temperature dependent specific heat capacity of the binary alloy was determined by fitting with TEMPUS results. The hemispherical total emissivity was estimated to be 0.27. Using the specific heat data and the hemispherical total emissivity, the enthalpy and entropy of fusion were calculated for the binary alloy. The viscosities for both the alloys were fit with the Vogel-Fulcher-Tammann equation to obtain the fragility parameter. The surface tension for the binary alloy showed an anomalous positive gradient while that of the ternary alloy showed a small negative gradient with temperature. (C) 2004 Elsevier B.V. All rights reserved.
机译：使用无容器高温高真空静电悬浮（ESL）技术确定二元共晶Ni59.5Nb40.5和三元合金Ni60Nb34.8Sn5.2的热物理性质。测得的热物理性质为密度，比热超过半球总发射率，表面张力和粘度。发现两种熔体的密度均高于混合物规则所预测的密度。这归因于三方成员之间强大的吸引力互动。通过与TEMPUS结果拟合确定二元合金的温度相关比热容。半球总发射率估计为0.27。使用比热数据和半球形总发射率，计算了二元合金的熔化焓和熵。两种合金的粘度均与Vogel-Fulcher-Tammann方程拟合以获得脆性参数。二元合金的表面张力显示出反常的正梯度，而三元合金的表面张力随温度显示出小的负梯度。 （C）2004 Elsevier B.V.保留所有权利。

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