Greater Than the Sum of Its Parts — Concurrent Alloy Design and Processing Science: An LMD Symposium Honoring Raymond Decker: Session I
Sponsored by: TMS Light Metals Division, TMS: Magnesium Committee
Program Organizers: Victoria Miller, University of Florida; Eric Nyberg, Kaiser Aluminum Trentwood; J. Brian Jordon, Baylor University; Wilhelmus Sillekens, European Space Agency; Neale Neelameggham, IND LLC; Vineet Joshi, Pacific Northwest National Laboratory
Monday 2:00 PM
March 15, 2021
Room: RM 31
Location: TMS2021 Virtual
Session Chair: Victoria Miller, University of Florida
2:00 PM Invited
Nickel-base Alloys Development:Then and Now: Victoria Miller1; Aziz Asphahani2; 1University of Florida; 2QuesTek
Within the field of high-performance alloys needed for demanding applications and safety-critical components, nickel-base alloys play a prominent role. With its metallurgical compatibility with other metals (e.g., Cr, Mo, W, Fe, Cu), nickel offered numerous opportunities for the development of advanced oxidation-resistant high-strength alloys (“Superalloys”) and aqueous corrosion-resistant alloys (“CRA”). The “THEN” alloys design via empirical approaches (i.e., trials and errors) will be illustrated with the past development of two well-known nickel-base CRA: INCONEL® alloy 625 and HASTELLOY® alloy C-22 in the 1950’s and the 1980’s. Also, with the advent of Integrated Computational materials Engineering (ICME) technologies, the “NOW” design of nickel-base Superalloys will be highlighted by the example of QuesTek® alloy SX-N, developed in 2019 for extreme high temperature applications. The impressive contributions of Dr. Ray Decker to elucidating the versatile role of nickel will be acknowledged.
2:30 PM Invited
New Under the Sun: Robert Carnahan1; Victoria Miller2; 1Retired; 2University of Florida
I’m delighted and honored for the priviledge to toast Dr. Raymond Decker, my dear old friend and colleague on this occasion. When we initially became engaged in Thixomolding of Magnesium in 1989, we were survivors of the 1980’s Corporate Merger and Acquisition Pandemic. A key feature ensuing M&A was consolidation and divesture of duplicate organizational functions to maximize investor’s returns, foremost of which was R&D. While the growth of the equipment and end-user base continues to grow beyond the expiration of the basic Process patents, Thixomat has morphed to a holding company in which its principal activity is further commercialization of Patented ultra fine Nano grain high strength Magnesium alloys for structural applications and BioMag, a patented Bioabsorbable Orthopedic implant for the CMF(Cranio Maxillo facial) market enabled by TMP of precursor Thixomolded biocompatible alloys.
3:00 PM Invited
Development of Biomaterials at NanoMAG from a Historical and Commercial Perspective: Victoria Miller1; Stephen LeBeau2; 1University of Florida; 2nanoMAG LLC
Throughout his career, Raymond Decker has noted that the development and commercialization of new alloys quite often involves a certain amount of serendipity. The most recent case of the development of BioMg 250 bioabsorbable magnesium alloy at nanoMAG is another classic example. The tortuous path taken by Ray and his colleagues at nanoMAG from initial conception to worldwide patents and ongoing preclinical studies will be described going back to initial work with the University of Michigan. The impact of strategic relationships with university professors, student interns, government funding agencies and industrial partners and their contributions to the success achieved to date will be reviewed. After a careful examination, looking back at the events of the last eight years at nanoMAG, the real question is, “Do you believe in coincidence or do things happen for a reason?” Perhaps there are there stronger forces acting behind the scenes to support technology development.
3:30 PM
Enabling High Strength AA7xxx Sheet for Automotive Hot Stamping Applications: A Microstructural Perspective: Atish Ray1; Tudor Piroteala1; Rashmi Ranjan Mohanty1; John Carsley1; 1Novelis Inc.
Owing to high specific strength, 7xxx aluminum alloys are attracting wide spread attention as potential light weighting alternatives to Press Hardened Steels (PHS) used in passenger safety centric automotive structural members. Similar to PHS, elevated temperature forming techniques using 7xxx aluminum alloys can provide a potential path for mass production of automotive structural parts with high strength and significantly reduced springback. In this study, hot tension tests were conducted on AA7075 sheets using a Gleeble thermomechanical simulator at temperatures between 400 and 480 C at strain rates between 0.1/s to 10/s. The elevated temperature flow stress is analyzed using sine-hyperbolic constitutive equation as proposed by Sellars. The activation energy of hot deformation for AA7075 is estimated to be 182 kJ/mol, which correlates with the deformation mechanism at grain boundaries. This work highlights that if the microstructure is not optimized, then steady state deformation can prematurely localize at grain boundaries.