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Fe24+xCo24−xCr15Mo14C15B6Y2 (x = 0, 2, 4, 6, 8, at.%) bulk amorphous alloys were prepared using a vacuum non-consumable arc furnace. The coefficients of thermal expansion and thermal conductivity of the alloys were measured using a thermal expansion tester and a laser flash thermal conductivity tester. The results were compared with differential scanning calorimetry (DSC) curves and high-temperature XRD patterns to study the linear thermal expansion behavior of bulk amorphous alloys with different Co contents as a function of temperature, and the influence of Co content and different structures on the thermal conductivity of Fe–Co-based bulk amorphous alloys. The results showed that as the Co content decreased, the alloys exhibited two similar crystallization processes, and the onset temperature of the second crystallization increased sequentially. When x = 0, the coefficient of thermal expansion showed a third peak at around 875 °C; at 25 °C, the thermal conductivity of Fe24+xCo24−xCr15Mo14C15B6Y2 (x = 0, 2, 4, 6, 8) bulk amorphous alloys ranged from 7.12 to 7.35 W/(m K). After annealing at 700 °C, the thermal conductivity of Fe24+xCo24−xCr15Mo14C15B6Y2 (x = 0, 2, 4, 6, 8) alloys ranged from 7.5 to 9.46 W/(m K), while significant changes in thermal conductivity were observed after annealing at 920 °C, showing a trend of first increasing and then decreasing.

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Thermal Expansion Characteristics and Thermal Conductivity of Fe–Co-Based Bulk Amorphous Alloys

  • 章节

  • 发表日期：

    2025年

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  • Q. J. Chen,
  • J. Wang,
  • J. Shen,
  • X. L. Zhou,
  • X. Z. Hua,
  • Y. G. Dong

摘要

Fe24+xCo24−xCr15Mo14C15B6Y2 (x = 0, 2, 4, 6, 8, at.%) bulk amorphous alloys were prepared using a vacuum non-consumable arc furnace. The coefficients of thermal expansion and thermal conductivity of the alloys were measured using a thermal expansion tester and a laser flash thermal conductivity tester. The results were compared with differential scanning calorimetry (DSC) curves and high-temperature XRD patterns to study the linear thermal expansion behavior of bulk amorphous alloys with different Co contents as a function of temperature, and the influence of Co content and different structures on the thermal conductivity of Fe–Co-based bulk amorphous alloys. The results showed that as the Co content decreased, the alloys exhibited two similar crystallization processes, and the onset temperature of the second crystallization increased sequentially. When x = 0, the coefficient of thermal expansion showed a third peak at around 875 °C; at 25 °C, the thermal conductivity of Fe24+xCo24−xCr15Mo14C15B6Y2 (x = 0, 2, 4, 6, 8) bulk amorphous alloys ranged from 7.12 to 7.35 W/(m K). After annealing at 700 °C, the thermal conductivity of Fe24+xCo24−xCr15Mo14C15B6Y2 (x = 0, 2, 4, 6, 8) alloys ranged from 7.5 to 9.46 W/(m K), while significant changes in thermal conductivity were observed after annealing at 920 °C, showing a trend of first increasing and then decreasing.