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<p>Laser powder bed fusion (LPBF) offers advantages such as in-situ alloying, flexible alloy design, and cost-effective production. Alloying refractory metals, including tantalum (Ta) and tungsten (W), is particularly promising for high-temperature applications due to their excellent performance under extreme conditions. In this study, TaW alloys were in-situ alloyed via LPBF, and their microstructural, mechanical, and acoustic properties were investigated. The addition of W refined the grain structure from columnar to equiaxed, reducing the average grain width from approximately 140&#xa0;μm (Ta) to 39&#xa0;μm (Ta10W), and increased the compressive yield strength from 500&#xa0;MPa to over 1080&#xa0;MPa. These improvements were confirmed through various metallurgical and ultrasonic analyses. Both longitudinal and shear-wave velocities increased with W content, while the anisotropy index decreased from 2.05 to 0.83%. The ultrasonic nonlinearity increased by 22%, consistent with the broadening of the rocking curve observed in XRD. These findings can accelerate the adoption of TaW alloys in high-performance industrial applications.</p>

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In-situ Alloying of Tantalum–Tungsten Via Laser Powder Bed Fusion: Microstructure, Mechanical, and Acoustic Properties

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Seong-Hyun Park,
  • Sukhee Choi,
  • Saebyeok Kim,
  • Kyung-Young Jhang,
  • Jiung Yoo,
  • Dong-gi Song

摘要

Laser powder bed fusion (LPBF) offers advantages such as in-situ alloying, flexible alloy design, and cost-effective production. Alloying refractory metals, including tantalum (Ta) and tungsten (W), is particularly promising for high-temperature applications due to their excellent performance under extreme conditions. In this study, TaW alloys were in-situ alloyed via LPBF, and their microstructural, mechanical, and acoustic properties were investigated. The addition of W refined the grain structure from columnar to equiaxed, reducing the average grain width from approximately 140 μm (Ta) to 39 μm (Ta10W), and increased the compressive yield strength from 500 MPa to over 1080 MPa. These improvements were confirmed through various metallurgical and ultrasonic analyses. Both longitudinal and shear-wave velocities increased with W content, while the anisotropy index decreased from 2.05 to 0.83%. The ultrasonic nonlinearity increased by 22%, consistent with the broadening of the rocking curve observed in XRD. These findings can accelerate the adoption of TaW alloys in high-performance industrial applications.