Advanced Joining of Single Crystal Aerospace Materials

对提高燃气轮机效率的不断增长的需求推动了工作温度的提高，导致使用耐热单晶(SX)镍基高温合金和Ni3Al基金属间化合物来制造航空发动机涡轮部件。连接不仅对于制造复杂形状的发动机部件至关重要，而且对于维修和翻新服役损坏的部件也是至关重要的。然而，SX镍基高温合金和SX Ni3Al基金属间化合物由于对焊缝裂纹的敏感性极高，很难通过传统的熔焊工艺进行连接。替代的先进技术，如瞬变-液相(TLP)连接，具有连接这些材料的潜力，而不会出现开裂问题。不幸的是，目前TLP粘接的商业应用在很大程度上是由于对多组分基材-填充合金体系粘接过程中微观结构发展的了解不足。本研究旨在推进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.