Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling: Poster Session
Sponsored by: TMS Structural Materials Division, TMS Functional Materials Division, TMS: Advanced Characterization, Testing, and Simulation Committee, TMS: Thin Films and Interfaces Committee
Program Organizers: Saurabh Puri, Microstructure Engineering; Amit Pandey, Lockheed Martin Space; Dhriti Bhattacharyya, Australian Nuclear Science and Technology Organization; Dongchan Jang, Korea Advanced Institute of Science and Technology; Shailendra Joshi, University of Houston; Josh Kacher, Georgia Institute of Technology; Minh-Son Pham, Imperial College London; Jagannathan Rajagopalan, Arizona State University; Robert Wheeler, Microtesting Solutions LLC

Tuesday 5:30 PM
March 1, 2022
Room: Exhibit Hall C
Location: Anaheim Convention Center

L-48: Deformation Behaviour of Novel Beta-Ti Bcc-Superalloys: Vincent Gagneur1; Tianhong Gu1; Alexander Knowles1; 1University of Birmingham
    Increasing the operating temperature of aerospace gas turbines is a key means to improve their fuel efficiency for both economic and environmental reasons, the main limitation being the capability of materials employed. Our work focusses on new Beta-titanium ‘bcc-superalloys’ to unlock the high melting point refractory metals of Mo and Nb paired with the low-density of Ti. Inspired by the widely used Nickel superalloys, these bcc-superalloys exploit a combination of a β matrix with ordered-bcc β’ precipitates. However, such bcc-superalloy systems are often found to be too brittle for commercial applications, and the lack of mechanistic understanding concerning their mechanical behaviour limits ductilisation strategies. In this project, newly developed β-β’ Ti-TiFe & derivative alloys are investigated using micromechanical testing coupled with digital image correlation (DIC). This analysis offers new insights as the deformation behaviour in such bcc-superalloys, in particular load partitioning, and slip plane compatibility between β and β’ phases.

L-50: Multiscale Mechanical Evaluation of FiberForm: Robert Quammen1; Paul F. Rottmann1; Connor Varney1; 1University of Kentucky
    Porous structures have shown promise for Thermal Protection System applications owing to their attractive functional properties. However, the constitutive properties of porous materials remain poorly understood due to their highly heterogeneous structure. Current computational research is attempting to model these relationships on both the ‘bulk’ and ‘local’ scale. In this work, compression tests have been conducted on rectangular FiberForm specimens using a custom microscale mechanical testing system to determine ‘bulk’ properties. Digital image correlation (DIC) was used to calculate full 2D local and average strain maps live during the course of the tests. To determine ‘local’ microscale properties of FiberForm samples, in-situ nanoindentation was utilized. SEM characterization pre- and post-indentation has been conducted and DIC strain analysis was employed to visualize critical features in the porous microstructure. These combined results will be useful to experimentally validate and inform evolving computational models of porous materials.