12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Wrought Alloys 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
Tuesday 9:50 AM
June 15, 2021
Room: Invited II
Location: Virtual
Session Chair: Bruce Williams, CanmetMATERIALS
9:50 AM Invited
Some Fundamental Questions on Wrought Mg Alloys: Jian-Feng Nie1; 1Monash University
Significant progress has been made in the past 20 years on wrought Mg alloys at fundamental and technological levels. At the fundamental level, textures formed in sheets and extrusions of different alloy compositions and produced under different strain paths or thermomechanical processing conditions are relatively well established, with the assistance of advanced characterisation techniques such as electron backscatter diffraction. At the technological level, room temperature formability of sheet has been improved, and tension-compression yield asymmetry of extrusion is also remarkably reduced. This presentation starts with some questions on dislocation dissociation, stacking faults, solute segregation, texture, and room temperature deformation behaviour of pure Mg and Mg alloys. With these questions, texture, grain size and deformation of sheets and extrusions produced under different processing conditions will be systematically examined and compared. Remaining and emerging scientific issues are then highlighted and discussed in the context of texture and grain size.
10:20 AM Invited
Strategies to Achieve Excellent Room Temperature Formability and High Strength in Wrought Magnesium Alloy Sheets: Taisuke Sasaki1; Ming-Zhe Bian2; Zehao Li1; Taiki Nakata3; Shigeharu Kamado3; Kazuhiro Hono1; 1National Institute for Materials Science; 2National Institute of Advanced Industrial Science and Technology; 3Nagaoka University of Technology
Heat treatable wrought magnesium alloy is promising as a strong and formable alloy sheet because Mg-Al-Zn-Ca-Mn and Mg-Zn-Ca-Zr alloys demonstrated comparable room temperature formability and strength with 6XXX series aluminum. This presentation will discuss strategies to achieve excellent room temperature formability and high strength in magnesium alloy sheets. The addition of Zn is beneficial in achieving good room temperature formability in the Mg-Ca-Al dilute alloy by texture weakening because the Zn addition facilitates the nucleation of weakly textured grains along twin boundaries during the solution treatment. However, the Zn content should be optimized to achieve satisfactory bake-hardenability, which is a unique feature that occurs in the dilute magnesium alloys strengthened by the precipitation of Guinier Preston (G.P.) zones. These bake-hardenable alloys exhibit high thermal conductivity. Therefore, the bake-hardenable magnesium alloy sheet is expected to broaden the application of wrought magnesium alloys.