|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Critical Fracture Toughness of Al 6061 Cold Spray Deposits
||Scott Julien, Sinan Muftu
|On-Site Speaker (Planned)
Cold spray additive manufacturing is of interest in the repair of aerospace and other specialized materials, where high-temperature processes are either undesirable or infeasible. However, the transition of application from coating to structural requires knowledge of the load-bearing capacity of cold spray deposits, such as tensile, fracture, and fatigue properties. In this work, we study the critical fracture toughness of cold spray deposits which has, thus far, received limited attention in the literature. We perform fracture tests on aluminum 6061 deposits in two different crack orientations and demonstrate that the fracture toughness is approximately one-third that of wrought 6061-T6 material. Fracture occurs predominantly as particle-particle decohesion, and pre-fracture estimation of the percentage unbonded volume in the deposits is approximately 2.5 to 4.0%. Thus, improving particle-particle bonding on cold spray deposits is critical for optimizing their load-bearing capacity.
||Additive Manufacturing, Powder Materials, Mechanical Properties