2023 Technical Division Student Poster Contest: LMD 2023 Technical Division Undergraduate Student Poster Contest
Program Organizers: TMS Administration
Monday 5:30 PM
March 20, 2023
Room: Exhibit Hall G
Location: SDCC
SPU-3: Correlating Local and Global Tensile Deformation Behavior of AlSi10Mg Specimens Fabricated Via Laser Powder Bed Fusion: Caleb Fronk1; Ritam Pal1; Amrita Basak1; 1Penn State University
AlSi10Mg, fabricated by the laser powder bed fusion (L-PBF) additive manufacturing process, offers many advantages compared to traditional cast material. In this study, its tensile properties are evaluated by investigating global and local deformation behavior via extensometer and strain gauge sensors, respectively. Specimens are built using recycled AlSi10Mg powder on ProX-320 L-PBF equipment using vetted process parameters, as suggested by 3D Systems. The as-built specimens contain a one-sided V-notch to precisely control the onset of failure. Strain gauges are installed near the notch region and the specimens are tested on an MTS 50 kN electromechanical load frame. The results show the strain gauge records higher strain in comparison to the extensometer due to its proximity to the notch tip. The experimental findings are also corroborated with finite element-based simulation results. In summary, this work establishes that strain gauge sensors can be used for online health monitoring of additive manufactured specimens.
SPU-4: Developing a Metallography Procedure to Investigate Compositional Effects on the Microstructure of Lightweight Metal Matrix Composites: Caleb Schenck1; Andrew O'Connor1; Michele Manuel1; 1University of Florida
Aerospace structural materials are engineered to be strong and lightweight. They may also provide multi-functionality, such as radiation shielding. Multi-functional magnesium (Mg) and magnesium-lithium (Mg-Li) matrix composites containing boron carbide (B4C) could be used in aircraft flight decks or in space vehicles for crew quarters or electronics boxes. Fabricated via stir casting, these composites were characterized by their grain size. This parameter can be controlled to influence macroscopic properties like yield strength. Due to the alternating hard reinforcement and soft matrix of these composites, the authors developed a unique polishing schedule and etching procedure to reveal their microstructure. After homogenization, optical metallography indicated the introduction of micron-sized B4C particles significantly reduced average grain size. Five percent by volume B4C reinforcement reduced average grain size, proxied by mean lineal intercept, by nearly an order of magnitude. Additionally, the average grain size appeared similar for both Mg and Mg-Li matrix composites.