12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Forming I
Program Organizers: Alan Luo, Ohio State University; Mihriban Pekguleryuz, McGill University; Sean Agnew, University of Virginia; John Allison, University of Michigan; Karl Kainer; Eric Nyberg, Kaiser Aluminum Trentwood; Warren Poole, University of British Columbia; Kumar Sadayappan, CanmetMATERIALS; Bruce Williams, Canmetmaterials Natural Resources Canada; Stephen Yue, Mcgill University
Wednesday 9:50 AM
June 16, 2021
Room: Invited III
Location: Virtual
Session Chair: Bruce Williams, CanmetMATERIALS
9:50 AM Invited
Solid Phase Processing of Magnesium Alloys: Scott Whalen1; Nicole Overman1; Vineet Joshi1; Tamas Varga1; Daniel Graff1; Curt Lavender1; William Frazier1; Mark Rhodes1; Timothy Roosendaal1; Ethan1; Robert Seffens1; Tianhao Wang1; Xiaolong Ma1; Joshua Silverstein1; Hrishikesh Das1; Madhusudhan Pallaka1; Angel Ortiz1; 1Pacific Northwest National Laboratory
The Solid Phase Processing group at the Pacific Northwest National Laboratory is investigating the role of extreme deformation on the ability to extrude and join magnesium alloys. This presentation will highlight two emerging technologies currently being developed; Rotating Hammer Riveting (RHR) and Shear Assisted Processing and Extrusion (ShAPE), with examples given for their implementation of magnesium alloys. Magnesium alloy AZ31 has been joined to thermoplastic carbon fiber reinforced polymer (CFRP) by RHR. With RHR, the rivet head is mixed with, and metallurgically bonded to, the underlying sheets being joined to form a robust fastener. The RHR process, joint properties, and microstructural characterization will be discussed. Non-rare earth magnesium alloy ZK60 has been extruded by ShAPE to form thin-walled tubing with a highly refined microstructure and basal plane alignment away from the extrusion direction. These tubes have been slit and rolled into sheet and foil with anisotropic material properties.
10:20 AM Invited
Eliminating Yield Anisotropy and Enhancing Ductility and Corrosion Resistance in Mg Alloys by Shear Assisted Processing and Extrusion: Vineet Joshi1; Dalong Zhang1; Kiran Solanki2; Jens Darsell1; Vikrant Beura2; Nicole Overman1; Darrell Herling1; 1Pacific Northwest National Laboratory; 2Arizona State University
Solid phase processing techniques such as friction stir welding, Shear assisted processing and extrusion (ShAPE)/ friction extrusion and cold spray have been successfully demonstrated as promising thermomechanical methods to produce metallic materials with enhanced performance. In this study, AZ series with and without silicon, ZK60 Mg alloys in as-received forms (as-cast or as-extruded) were processed using Shear Assisted Processing and Extrusion (ShAPE). Microstructural characterization was performed using EBSD and TEM and revealed that as compared to the feedstock materials/ billets, friction extruded Mg alloys had more uniform microstructure, equiaxed grains, finer and homogeneously distributed precipitates and chemical homogeneity. It was also observed that basal planes were not oriented parallel to extrusion axis. As a result, rod products exhibited significantly reduced (in some cases eliminated) yield asymmetry and achieved enhanced ductility, which were uncommon or difficult to attain using conventional processing techniques.