Magnesium Technology: Keynote Session
Sponsored by: TMS Light Metals Division, TMS: Magnesium Committee
Program Organizers: Petra Maier, University of Applied Sciences Stralsund; Steven Barela, Terves, Inc; Victoria Miller, University of Florida; Neale Neelameggham, IND LLC
Monday 8:30 AM
February 28, 2022
Room: 210A
Location: Anaheim Convention Center
Session Chair: Petra Maier, University of Applied Sciences Stralsund; Steven Barela, Terves, Inc.
8:30 AM Introductory Comments
8:40 AM Keynote
Magnesium Alloy Development for Structural and Biomedical Applications: Alan Luo1; 1Ohio State University
This talk presents an overview of magnesium alloy development at The Ohio State University in collaboration with its industrial partners. Firstly, a new Mg sheet alloy has achieved a yield strength of 270 MPa, tensile elongation of 31% and Erichsen index of 7.8 mm, promising room-temperature forming applications. This alloy also has excellent extrudability and mechanical properties in extruded products. The second example is a high strength magnesium alloy containing long period stacking ordered (LPSO) and age-hardening precipitation phases, for casting applications. The final example is a Mg-Zn-Ca based bioresorbable alloy with outstanding mechanical and corrosion properties for biomedical such as skeletal fixation and cardiac stent devices. In all these examples, alloy design and process (casting and their thermomechanical processing) development have been achieved using an integrated computational materials engineering (ICME) approach.
9:20 AM Keynote
Unlocking the Strengthening Potential of Magnesium Alloys Using Deformation-induced Clustering and Precipitation: Suhas Eswarappa Prameela1; Taisuke Sasaki2; Peng Yi1; Michael Falk1; Timothy Weihs1; 1Johns Hopkins University; 2NIMS
Light metals of Aluminum (Al) and Magnesium (Mg) hold great promise in many structural applications. However, the overall progress in strengthening these metals has been remarkably different. While significant improvement has been achieved in developing high-strength Al alloys, the anisotropic hexagonal crystal system and complex plasticity mechanisms have made the design of high-strength Mg alloys a challenging exercise. Our recent studies have examined two binary Mg chemistries, mainly the Mg-Al and Mg-Zn systems. These rare-earth-free alloys offer a chance to conduct fundamental studies of precipitation mechanisms and processing pathways that can help alter the nucleation events leading to precipitate formation. We demonstrate that careful control of atomic-scale defects such as dislocations and vacancies can significantly alter the nucleation barrier, promote solute clustering far from and along dislocation lines, along twin boundaries and within twins, and along grain boundaries. These novel microstructures show promise in boosting precipitation strengthening in Mg alloys.
10:00 AM Break
10:15 AM Keynote
An Update on Magnesium Based Powder Metallurgy and Additive Manufacturing Processes: Rajiv Tandon1; 1Luxfer Magtech
Pure magnesium powders are used in a variety of applications including infrared countermeasure flares, flameless-ration heaters, welding electrodes, pyrotechnics, and steel desulfurization. Powder metallurgy offers potential processing routes to tailor compositions and unique microstructures to achieve high mechanical properties in magnesium alloys. Secondary phase reinforcements including nanoparticle additions can be utilized to achieve unique combinations of strength, lightweight, wear and toughness, thus pushing the envelope of high performance lightweight applications. Furthermore, magnesium based alloys have also been widely investigated as bioresorbable implants due to their adjustable corrosion properties. This has led to emerging interests in the potential to fabricate magnesium based bespoke structures via additive manufacturing processes. This presentation will focus on the potential and challenges associated with using magnesium alloy powders for powder metallurgy and additive manufacturing processes.
10:55 AM Keynote
Historical Developments and Status of Carbothermal Reduction Technology to Produce Magnesium Metal: Aaron Palumbo1; Boris Chubukov1; 1Big Blue Technologies
Carbothermal reduction (CTR) technology for Mg metal production was realized by F.J. Hansgirg in the 1930’s, but the process was unprofitable after the end of the WWII. Since then, many attempts have been made to demonstrate inherent advantages of CTR: low energy intensity and corresponding economic value proposition by reducing the production costs. The operating paradigms of historical and current attempts used to prove technical feasibility have been centralized on the condenser, where Mg-vapor and byproduct CO-gas are separated by phase change. Preventing reversion, or re-oxidation of Mg-products, was the focus of most efforts as embodied by the development of a converging-diverging nozzle and the use of inert solvents, such as oils, molten metals, and salts. These historical developments in CTR-technology provide context to guide a holistic approach to designing a robust and economically viable CTR-process where the condenser is just one part.