| Abstract Scope |
Titanium alloys are critical lightweight, high-strength structure materials for next generation aircraft. For example, metastable beta Ti-5Al-5Mo-5V-3Cr (Ti-5553) alloy is widely used in landing gear application. However, relatively high manufacturing cost limits its wider application. In this work, we employed additive manufacturing techniques, including selective laser melting (SLM) and direct energy deposition (DED), to fabricate the Ti-5553 alloy. We quantitatively studied the micro- and nanostructures in the SLM and DED Ti-5553 using advanced SEM, TEM, and 3D APT. The as-built microstructures and nanostructures formed in SLM and DED Ti-5553 are compared to those formed in conventionally processed counterparts. Special attention is given to the formation of nanoscale phases, such as omega phase and O’ phase, during the AM process. Their influence on the phase transformations during post-heat treatment and deformation behavior will be discussed. This work provides new insights into microstructure control in AM Ti-5553. |