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

块体金属玻璃（BMG）的增材制造最近已经成为一种可行的方法。特别是激光粉末床熔融（PBF-LB/M）被认为是一种很有前途的技术，以克服在BMG制造过程中的尺寸和复杂性的限制。与晶体合金相比，BMG具有约2%的异常大的弹性极限以及高强度和硬度。它们的特性使它们成为高应力应用中破坏性材料替代品的潜在候选者。最近发现的含硫TiZrCuS合金具有高耐腐蚀性，其强度几乎是Ti6 Al 4V的两倍。然而，它们的约1 mm的小临界铸造厚度处于块状金属玻璃的定义（1 mm或更大）的边缘。这有效地使该合金的常规铸造工艺不适合作为用于广泛应用的功能性生产路线。然而，TiZrCuS合金在低温过冷液相区具有相当好的抗晶化热稳定性。这使得系统在循环热暴露下对结晶具有鲁棒性，如在PBF-LB/M期间存在的。然而，大量的氧杂质和有限的知识，对热历史的挑战PBF-LB/M过程中的无定形玻璃化。在这个问题上，该项目旨在研究PBF-LB/M处理Ti60 Zr 15 Cu 17 S8过程中的激光-材料相互作用。通过高速成像，比率高温计和有限元模拟的瞬态激光材料相互作用过程中的热剖面和历史的彻底调查将进行鉴于所产生的热力学，结构和制造的样品的技术性能。

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.