Development in Light Weight Alloys and Composites: Processing and Mechanical Performance
Sponsored by: TMS Composite Materials Committee, TMS Materials Characterization Committee
Program Organizers: Ramasis Goswami, Naval Research Laboratory; Nikhil Gupta, New York University; Aashish Rohatgi, Pacific Northwest National Laboratory; Tanjore Jayaraman, United States Air Force Academy
Monday 2:00 PM
October 10, 2022
Room: 317
Location: David L. Lawrence Convention Center
Session Chair: Ramasis Goswami, US Naval Research Laboratory
2:00 PM Invited
Delayed Aging in Aluminum Alloys: Ramachandra Canumalla1; Samuel Meyer1; 1Weldaloy Specialty Forgings
“Delayed Aging” is a term used for the delay at room temperature between “Solution treatment & Quenching” and “artificial aging” resulting in a loss in mechanical properties. This has scientific and industrial importance. Deterioration in properties due to delayed aging was observed in various classes of aluminum alloys namely 2XXX, 6XXX and 7XXX. There are differences between these various classes of aluminum alloys due to delayed Aging. There is a significant drop in strength properties in 6XXX alloys compared to other classes of alloys. The differences in these alloys are explained with the help of Pashley’s Kinetic model. Data in the open literature was reviewed and ways to mitigate the debit in the mechanical properties by employing the “diffusion on demand” concept with trace additions, cold storage or refrigeration, V shape behavior with delayed aging depending on the alloy system and any other have been highlighted.
2:40 PM Invited
Correlations between Ultrasonic Processing, Reinforcement Morphology, and Multi-scale Mechanical Performance of Metal Matrix Composites: Tanaji Paul1; Riddhi Joshi1; Cheng Zhang1; Benjamin Boesl1; Arvind Agarwal1; 1Florida International University
Ultrasonic casting has recently emerged as a promising technique for manufacturing metal matrix composites that exhibit high strength, wear resistance while being lightweight. However, an absence of understanding of the interaction between ultrasonic process parameters and the morphology of reinforcement particles severely impedes casting high performance composites. This paper presents comprehensive correlations between ultrasonic processing and dispersion of 3D, 2D, and 1D reinforcements in aluminum matrix composites. The effect of dispersion on multiscale mechanical properties are delineated by quasi-static nanoindentation, dynamic modulus mapping and finite element modeling. This new scientific knowledge about the interrelatedness between ultrasonic processing, reinforcement material morphology, and composite performance is thus a significant advancement to the current state of the art in metal matrix composite manufacturing technologies.
3:10 PM
Development and Research of a Scandium-containing Filler for Welding Aircraft Products from an Alloy of the Mg-Zr-Nd System: Volodymyr Tsyganov1; Vadim Shalomeev1; Sergei Sheyko2; 1"Zaporizhzhia Polytechnic" National University; 2Zaporizhzhia National University
Based on the results of the systematic research of structure and multi-component phases, formation filler material which contains scandium for aviation casting welding from the alloy of the system Mg-Zr-Nd was developed. Scandium influence in the filler magnesium alloy on its mechanical and special properties was studied. It was found that modifying of magnesium alloy by scandium in a quantity up to 0,05…0,07 % allows to get a fine-grained structure, increased level of mechanical properties and heat-resistance through complex intermetallic phases and hard solution microalloying formation. Aviation cast details welding produced from magnesium alloy by filler material which contains scandium allows to get a welding seam with a dense homogeneous fusion and around-seam zones without any defects. Applying of the filler material which contains scandium for welding products from the alloy of the system Mg-Zr-Nd allows increasing significantly mechanical properties, heat-resistance and reliability of aviation constructions as a whole.
3:30 PM Break
3:50 PM Invited
Investigating Solid Solution Formation in High Entropy Carbide-based Ceramics: Lavina Backman1; Heonjune Ryou1; James Wollmershauser1; Syed Qadri1; Edward Gorzkowski1; Jesse Maxwell1; 1U.S. Naval Research Laboratory
Material requirements for ultra-high temperature applications include high thermal and dimensional stability, good thermal shock resistance, low reactivity and low coefficients of thermal expansion. The development of ultra-high temperature materials with both high thermochemical stability and appreciable mechanical properties (ductility, toughness, etc.) has continued to be a research challenge. The advent of the high entropy design paradigm has significantly expanded the composition space for a class of such materials, Ultra-High Temperature Ceramics (UHTCs), providing the potential to tune compositions for the needed material properties. One strategy is via the application of valence electron concentration (VEC) considerations. This is, however, critically dependent on the formation of complete solid solutions. To evaluate VEC rule adherence, four-component carbonitride compositions were fabricated and characterized in this study. Results from the investigation of solid solution formation using X-ray diffraction and electron microscopy will be presented.
4:20 PM Invited
Ultrasonically-Induced Microstructural Refinement to Improve Strength of an Al-Si-Mg Casting: Katherine Rader1; Jens Darsell1; Jon Helgeland1; Timothy Roosendaal1; Ethan Nickerson1; Aashish Rohatgi1; 1Pacific Northwest National Laboratory
Ultrasonic melt processing of aluminum alloys is of interest to improve the mechanical properties of cast automotive components through local microstructural refinement. In this study, ultrasonic vibrations were applied during solidification of a commercial Al-Si-Mg alloy with added Fe content and cast in a graphite mold. Casting with the application of ultrasound changed the morphology of the microstructure from dendritic to non-dendritic, reduced the equivalent grain size of the primary aluminum grains by approximately 80 %, and changed the morphology of β-Al5FeSi phase particles from needle-shaped to rectangular. Iron contamination can be detrimental to mechanical performance. However, the ultrasonically-modified non-dendritic microstructure is expected to be stronger and more ductile than the dendritic microstructures of typical castings. Therefore, casting an Al-Si-Mg alloy with high Fe content with the application of ultrasound can potentially produce microstructures with mechanical properties comparable to an alloy with low Fe content.