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Tungsten (W) and its alloys are considered to be the most promising plasma-facing materials (PFMs) in divertor components due to their high melting pointMelting point, high strength at elevated temperaturesTemperature, and high resistance to neutron damage. To overcome severe problems such as brittleness and severe plastic deformation, rare-earth boridesRare-earth boride that have a high melting pointMelting point, hardnessHardness, neutron absorbability, and low electronic work function, volatility can be reinforced to W matrix. In this study, high purity and nanoscale 2 wt.% rare-earth boride (CeB6, NdB6, and ErB4) powders were reinforced to pre-alloyed W1Ni that is milled for 6 h at 800 rpm. According to the X-ray diffraction (XRD) results, W peaks were obtained with a small amount of WC impurity. The average particle and crystallite size and latticeLattice strain of composite powders were measured. The powders were consolidated with the pressureless sinteringSintering (1400 °C for 1 h). Three different phases were determined for the composites based on the scanning electron microscopyScanning electron microscopy. While the Vickers microhardnessesMicrohardness of W1Ni-2CeB6, NdB6, and ErB4 composites were measured as 6.79, 6.36, and 6.53 GPa, respectively, the wear volume losses were measured as 0.99, 1.68, and 3.17 × 10–4 mm3, respectively. These results were supported by wear rates and wear friction coefficient. The PS’ed composites were exposed to He+ ions. The mechanical and irradiation behavior of tungsten was investigated with addition rare-earth boridesRare-earth boride into W matrix in this study.

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Development of Tungsten Composites as Plasma-Facing Materials by Doping Rare-Earth Boride Particulates

  • 会议论文

  • 发表日期：

    2025年

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  • Burçak Boztemur,
  • Yue Xu,
  • Laima Luo,
  • M. Lütfi Öveçoğlu,
  • Duygu Ağaoğulları

摘要

Tungsten (W) and its alloys are considered to be the most promising plasma-facing materials (PFMs) in divertor components due to their high melting pointMelting point, high strength at elevated temperaturesTemperature, and high resistance to neutron damage. To overcome severe problems such as brittleness and severe plastic deformation, rare-earth boridesRare-earth boride that have a high melting pointMelting point, hardnessHardness, neutron absorbability, and low electronic work function, volatility can be reinforced to W matrix. In this study, high purity and nanoscale 2 wt.% rare-earth boride (CeB6, NdB6, and ErB4) powders were reinforced to pre-alloyed W1Ni that is milled for 6 h at 800 rpm. According to the X-ray diffraction (XRD) results, W peaks were obtained with a small amount of WC impurity. The average particle and crystallite size and latticeLattice strain of composite powders were measured. The powders were consolidated with the pressureless sinteringSintering (1400 °C for 1 h). Three different phases were determined for the composites based on the scanning electron microscopyScanning electron microscopy. While the Vickers microhardnessesMicrohardness of W1Ni-2CeB6, NdB6, and ErB4 composites were measured as 6.79, 6.36, and 6.53 GPa, respectively, the wear volume losses were measured as 0.99, 1.68, and 3.17 × 10–4 mm3, respectively. These results were supported by wear rates and wear friction coefficient. The PS’ed composites were exposed to He+ ions. The mechanical and irradiation behavior of tungsten was investigated with addition rare-earth boridesRare-earth boride into W matrix in this study.