Temperature dependence of heat capacity and electrical resistivity of Zr-based bulk glassy alloys

Okai, Daisuke; Fukami, Tatsuki; Yamasaki, Tohru; Zhang, T.; Inoue, Akihisa

doi:10.1016/j.msea.2003.10.148

Cited by 17 publications

(14 citation statements)

References 11 publications

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“…19) Therefore, the present result also confirms that lowering of the process temperature is effective to suppress the oxidation level of the resulting deposits.…”

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confidence: 81%

Fabrication and Mechanical Properties of Composite Structure by Warm Spraying of Zr-Base Metallic Glass

et al. 2008

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Metallic glasses are highly attractive because of their superior strength, relatively low Young's modulus and superb corrosion resistance[S1], etc. By combining a metallic glass with different materials, synergy effect can be expected in the mechanical properties and corrosion resistance, for example. Fabricating a thick metallic glass layer on a substrate material by thermal spray process is one way to bond these materials. In such practice, however, the temperature of the sprayed metallic glass and that of the substrate must be kept relatively low in order to avoid crystallization and/or oxidation of the amorphous deposits. Warm Spray is a modified version of HVOF spraying developed by National Institute for Materials Science (NIMS) suited for spraying of heat sensitive feedstock materials. In the process, high-velocity solid particles heated to the temperatures below its melting point are projected on to the substrate. A Zr-base metallic glass powder was warm sprayed onto cylindrical substrates of 316L stainless steel to various thicknesses. Negligible crystallization and oxidation were observed in the deposited layer of the glass alloy. The linear relationship between the thickness of the glass alloy layer and the Young's modulus of the composite bar demonstrated that the mechanical property of such composite structures can be controlled.

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“…19) Therefore, the present result also confirms that lowering of the process temperature is effective to suppress the oxidation level of the resulting deposits.…”

supporting

confidence: 81%

Fabrication and Mechanical Properties of Composite Structure by Warm Spraying of Zr-Base Metallic Glass

et al. 2008

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“…It is considered that the absolute value becomes larger with increasing Ni content, and the behavior is similar to that in the literature, whereas the electrical resistivity at room temperature is somewhat lower than that of the reported values. 15) The electrical resistivity at room temperature of the Zr 42 Cu 42 Ag 8 Al 8 BMG alloy is about 170 © 10 ¹8 ³·m and the value of the TCR is +3.2 © 10 ¹5 K ¹1 . Figure 6 indicates examples of the measurements of the thermopower, which is given by the temperature derivative of the power voltage between the two probes, for BMG alloy (1st cycle) and its specimens later heated up to 873 K (2nd cycle) for x = 5 (Zr 55 Al 10 Cu 30 Ni 5 ).…”

Section: Resultsmentioning

confidence: 99%

Thermal and Electrical Transport Properties of Zr-Based Bulk Metallic Glassy Alloys with High Glass-Forming Ability

Umetsu

Goto

2012

Mater. Trans.

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Thermal and electrical transport properties, such as thermal diffusivity, the electrical resistivity and thermopower of the Zr-based bulk metallic glassy (BMG) alloys of Zr 42 Cu 42 Ag 8 Al 8 and Zr 55 Al 10 Cu 35¹x Ni x (x = 0, 5 and 10) with high glass-forming ability were investigated. Thermal diffusivity is comparatively low at about 2 © 10 ¹6 m 2 s ¹1 , reflecting the aperiodic crystal structure of the BMG, whereas it becomes higher and depends on the alloy compositions after their crystallization. The phonon contribution to the thermal conductivity of the BMG alloys is thought to be small, based on a comparison with the estimated value of the electronic contribution to the thermal conductivity from the WiedemannFranz law. The thermopower of the present Zr-based BMG alloys shows a small positive value around room temperature, which is a general feature of nonmagnetic amorphous alloys.

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“…where r is the density with a value of 6.82 g cm À3 , C p z 0.33 J g À1 K À1 at 298 K [19], and a 0 is the thermal diffusivity with a value of 2.2 Â 10 À6 m 2 s À1 at 298 K [20]. For Eq.…”

Section: Dsd3mentioning

confidence: 99%

Multi-step shear banding for bulk metallic glasses at ambient and cryogenic temperatures

Qiao

Jia

Zhang

et al. 2012

Materials Chemistry and Physics

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Temperature dependence of heat capacity and electrical resistivity of Zr-based bulk glassy alloys

Cited by 17 publications

References 11 publications

Fabrication and Mechanical Properties of Composite Structure by Warm Spraying of Zr-Base Metallic Glass

Fabrication and Mechanical Properties of Composite Structure by Warm Spraying of Zr-Base Metallic Glass

Thermal and Electrical Transport Properties of Zr-Based Bulk Metallic Glassy Alloys with High Glass-Forming Ability

Multi-step shear banding for bulk metallic glasses at ambient and cryogenic temperatures

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