Bulk Metallic Glasses XIX: Novel Alloys, Processing or Manufacturing Methods
Sponsored by: TMS Structural Materials Division, TMS: Mechanical Behavior of Materials Committee
Program Organizers: Robert Maass, Federal Institute of Materials Research and Testing (BAM); Peter Derlet, Paul Scherrer Institut; Katharine Flores, Washington University in St. Louis; Yonghao Sun, Chinese Academy of Sciences; Lindsay Greer, University of Cambridge; Peter Liaw, University of Tennessee
Thursday 2:00 PM
March 3, 2022
Room: 253C
Location: Anaheim Convention Center
Session Chair: Sydney Corona, Federal Institute for Materials Research and Testing (BAM)
2:00 PM Invited
Lab-scale Injection Molding of Bulk Metallic Glasses: Douglas Hofmann1; Scott Roberts2; 1NASA Jet Propulsion Laboratory
; 2NASA Jet Propulsion Laboratory
Cold-walled, horizontal injection molding has proven to be a commercially viable process for producing high-quality net-shaped parts from bulk metallic glasses (BMGs). The current talk focuses on the initial development and testing of a lab-scale version of a pneumatically-driven, cold-walled injection-molder designed in 2007 and built in 2012 at NASA JPL/Caltech. The equipment was used to study the manufacturing of BMGs and BMG metal matrix composites under a variety of molding conditions. Infrared imaging was calibrated with embedded thermocouples to produce non-contact temperature measurements and processing profiles were developed under different induction coil designs. Lessons-learned in the development of BMG injection molding continue to have implications on current manufacturing methods.
2:25 PM
The Secondary Glass Phase in High Fragility PtCuP Bulk Metallic Glass: Sydney Corona1; Jong Na2; Qi An3; William Goddard1; Konrad Samwer4; William Johnson1; 1California Institute of Technology; 2Glassimetal Technologies; 3University of Nevada, Reno; 4University of Göttingen
Bulk Metallic Glasses (BMGs) – traditionally understood as a single-phase disordered glass – display a liquid-liquid (glass-glass) phase transition at the fragile limit in PtCuP glass. Thermodynamic studies on this system revealed a repeatable and well-defined latent heat at high Angell fragility, and the existence of this transition leads to a natural resolution to the Kauzmann Paradox.This work investigates the mechanical properties of the two liquid/glass phases through Vicker’s hardness and shear modulus, as well as structural and compositional analysis via Scanning Electron Microscopy (SEM)-paired Energy Dispersive Spectroscopy (EDS) and dark-field Transmission Electron Microscopy (TEM).
2:45 PM
Towards Qualifying Bulk Metallic Glasses for Spacecraft Components: Punnathat Bordeenithikasem1; Douglas Hofmann1; Richard Otis1; Robert Dillon1; 1NASA Jet Propulsion Laboratory
The outstanding properties of bulk metallic glasses (BMGs) have been attractive for spacecraft applications due to the associated steep performance requirements. With advances in BMG manufacturing and supply chain, BMG spacecraft components have shown increases in technology readiness and maturation of the corresponding part qualification processes. In this talk, recent work involving the development of BMG gears and other components will be discussed. In depth mechanical and thermal characterization of the BMG alloys for component qualification will also be presented.
3:05 PM Discussion on novel alloys and processing of metallic glasses