Sulfur bearing Ti-based bulk metallic glasses for the Laser Powder Bed Fusion of metals

用于金属激光粉末床熔融的含硫钛基大块金属玻璃

• 批准号: 503259970
• 负责人: Professor Dr. Ralf Busch
• 金额: --
• 依托单位: Institut für Produkt Engineering
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/503259970?language=en
• 关键词: Sulfur; bearing; Ti; based; bulk

Additive manufacturing of bulk metallic glasses (BMGs) has recently emerged as a viable method. Especially laser powder bed fusion (PBF-LB/M) was established as a promising technique to overcome the limitations in size and complexity during the fabrication of BMGs. In comparison to crystalline alloys, BMGs feature exceptional large elastic limits of about 2 % combined with high strength and hardness. Their properties profile renders them as potential candidates for disruptive material substitutions in highly stressed applications. The recently discovered sulfur-bearing TiZrCuS alloys offer high corrosion resistance and almost twice the strength of Ti6Al4V. However, their small critical casting thickness of about 1 mm is on the edge of the definition of a bulk metallic glass (1 mm or more). This effectively disqualifies conventional casting processes of this alloy as a functional production route for a broad spectrum of applications. Yet, TiZrCuS alloys feature a respectable thermal stability against crystallization in the low-temperature supercooled liquid region. This makes the system robust against crystallization under cyclic thermal exposure, as present during PBF-LB/M. However, large amounts of oxygen impurities and limited knowledge about the thermal history challenge the amorphous vitrification during PBF-LB/M. In this matter, the project aims to investigate the laser-material interaction during PBF-LB/M processing of Ti60Zr15Cu17S8. A thorough investigation of the thermal profiles and history during the transient laser-material interaction via high-speed imaging, ratio-pyrometry, and FEM simulations will be conducted in view of the resulting thermodynamic, structural, and technological properties of the manufactured samples.

增材制造大块金属玻璃（bmg）最近成为一种可行的方法。特别是激光粉末床熔合（PBF-LB/M）是一种很有前途的技术，可以克服bmg制造过程中尺寸和复杂性的限制。与结晶合金相比，bmg具有约2 %的大弹性极限，同时具有高强度和硬度。它们的特性使它们成为高应力应用中破坏性材料替代的潜在候选材料。最近发现的含硫tizrcu合金具有很高的耐腐蚀性，强度几乎是Ti6Al4V的两倍。然而，他们的小临界铸造厚度约为1毫米，是在大块金属玻璃定义的边缘（1毫米或更多）。这有效地取消了该合金作为广泛应用的功能性生产路线的传统铸造工艺。然而，tizrcu合金在低温过冷液体区域具有良好的热稳定性。这使得系统在循环热暴露下具有抗结晶性，就像在PBF-LB/M过程中一样。然而，大量的氧杂质和对热历史的有限了解给PBF-LB/M过程中的非晶玻璃化带来了挑战。在这个问题上，该项目旨在研究在PBF-LB/M加工Ti60Zr15Cu17S8时激光与材料的相互作用。通过高速成像、比热法和FEM模拟，将对瞬态激光与材料相互作用期间的热剖面和历史进行彻底的研究，以得出制造样品的热力学、结构和技术特性。