Advanced Joining of Single Crystal Aerospace Materials

对提高燃气涡轮发动机效率的需求不断增加，导致工作温度更高，导致使用耐热单晶（SX） ni基高温合金和ni3al基金属间化合物来制造航空发动机涡轮部件。连接不仅对复杂形状的发动机部件的制造至关重要，而且对服役损坏部件的维修和翻新也至关重要。然而，由于SX ni基高温合金和SX ni3al基金属间化合物极易发生焊缝开裂，因此很难通过传统的熔焊工艺进行连接。其他先进的技术，如瞬态液相（TLP）键合，有可能在不产生开裂问题的情况下连接这些材料。不幸的是，由于对多组分基填料合金体系粘接过程中微观组织的发展了解不足，目前TLP粘接的商业应用受到限制。所提出的研究旨在推进TLP键合的工业应用。

The ever-increasing demand for improved gas turbine engine efficiency has driven operating temperatures higher, leading to the use of heat resistant single crystal (SX) Ni-base superalloys and Ni3Al-base intermetallics to manufacture aero-engine turbine components. Joining is not only essential for the fabrication of complex shaped engine components, but it is also crucial for the repair and refurbishment of service-damaged parts. SX Ni-base superalloys and SX Ni3Al-base intermetallics are, however, extremely difficult to join by conventional fusion welding processes due to their high susceptibility to weld cracking. Alternate advanced techniques such as transient-liquid-phase (TLP) bonding hold potential for joining these materials without the problem of cracking. Unfortunately, the commercial use of TLP bonding is currently limited largely due to the inadequate understanding of microstructural development during the bonding of multi-component base-filler alloy systems. The proposed research is aimed at advancing industrial applications of TLP bonding.