搜索
TaC-reinforced GH4099 superalloy composite for enhanced high-temperature performance by additive manufacturing
发布时间：2026-06-23
点击次数：
- 发布时间：
- 2026-06-23
- DOI码：
- 10.1016/j.compositesb.2026.113920
- 论文名称：
- TaC-reinforced GH4099 superalloy composite for enhanced high-temperature performance by additive manufacturing
- 发表刊物：
- Composites Part B
- 关键字：
- Ni-based superalloy Metal matrix composite Laser powder bed fusion Microstructure Mechanical performance
- 摘要：
- Weldable superalloys are well-suited for additive manufacturing; however, their typically low (Al + Ti) content often leads to inadequate high-temperature strength for demanding aerospace applications. To overcome this limitation, xTaC/GH4099 composites were fabricated in this study via wet ball milling and powder bed fusion-laser beam (PBF-LB). The influence of TaC content on microstructure and tensile properties was systematically investigated. With the transition from epitaxial to randomly oriented equiaxed growth, the 2TaC/GH4099 composite experienced a multi-element synergistic diffusion process: Ta dissolved into the matrix, while Ti, W, and Mo migrated into TaC, resulting in a dual-phase carbide structure comprising MC and M23C6. Dislocation cells and loops were also discovered. This microstructural evolution improved the high-temperature load resistance via the combined effects of solid-solution strengthening, Orowan strengthening, and CTE mismatch mechanisms. As a result, the 2TaC/GH4099 composite achieved an ultimate tensile strength of 528.7 MPa at 900 °C—a 27% improvement over the pure GH4099 alloy (415.5 MPa)—along with a 73% increase in elongation (from 3.0% to 5.2%). However, when the TaC content exceeded 3 wt%, coarse script-like MC carbides became the dominant phase, causing severe degradation of high-temperature ductility and inducing embrittlement. This work clarifies the microstructural evolution and strengthening mechanisms in TaC-reinforced GH4099 composites prepared by PBF-LB, offering valuable guidance for the design of high-performance metal matrix composites for short-term high-temperature tensile performance.
- 第一作者：
- Mingjie Li.
- 是否译文：
- 否
