12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Primary, Recycling, & Solidification Processing
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 10:50 AM
June 16, 2021
Room: Contributed I
Location: Virtual

Session Chair: Paul Uguccioni, International Magnesium Association


Electro-chemo-mechanical Modelling of Corrosion Induced Material Damage: Daniel Hoeche1; Natalia Konchakova1; Mikhail Zheludkevich1; Carsten Blawert1; Wolfgang Weber2; Zahid Mir1; Mohammad Reza Shariati2; 1Helmholtz-Zentrum Geesthacht; 2Helmut-Schmidt University
    Modelling and simulation of surface degradation and related material damage due to combination of aggressive environmental attack with mechanical loads is in the focus of this approach. A corrosion model is fully coupled to a mechanical model enabling the description of damage related system changes. The evolution of corrosion and its impact on the stress -strain relationship are analyzed numerically and compared with the experimental investigation on extruded cp-Mg. The aim of the study is to understand and to quantify the influence of corrosion related geometry and morphology changes on damage initiation and progress, and to devolop a numerical framework towards elimination of damage variables.

Microstructural and Mechanical Properties of Solid-state Additively Manufactured Friction Stir Deposited Magnesium AZ31: Thomas Robinson1; Malcolm Williams1; Harish Rao1; Ryan Kinser1; Brian Jordon1; Paul Allison1; 1University of Alabama
    This work examines a bulk deposition of additive friction stir deposition (AFS-D) of AZ31 Mg Alloy. The AFS-D process was used to fabricate a 4” by 4” by 1/4” tall deposition of AZ31 Mg alloy using a differentiating raster pattern. The effect of the bulk deposition on material properties was examined using microstructure characterization and mechanical testing. Electron Back-Scattered Diffraction (EBSD) was utilized to evaluate the microstructure of the AFS-D specimens at high interest areas in the raster pattern compared to the microstructure of the base material. Quasi-static tests at ambient temperature were performed to evaluate the mechanical performance of the AFS-D specimens compared to that of the base material. Post-mortem analysis via scanning electron microscopy (SEM) was used to elucidate the underlying factors of mechanical response of the AFS-D specimens.

A HAADF STEM Study on Nucleation and Growth Crystallography of Al8Mn5 on B2-Al(Mn,Fe) Intermetallic in AZ91 Alloy: Guang Zeng1; Wenhui Yang2; Masaki Kudo2; Kazuhiro Nogita3; Syo Matsumura2; Christopher Gourlay4; 1Central South University; 2Kyushu University; 3The University of Queensland; 4Imperial College London
    Al-Mn-Fe compounds are important for providing corrosion resistance to magnesium alloys. Many Al8Mn5 particles contained a B2-Al(Mn,Fe) particle near their centre due to Al8Mn5 nucleation on B2 followed by an incomplete peritectic transformation. However, there is uncertainty about the crystallography and the nature of the interface structure at Al8Mn5 twin boundaries and Al(Mn,Fe)-Al8Mn5 boundaries. The present study has succeeded in direct observation of B2/Al8Mn5 intermetallics by aberration-corrected scanning transmission electron microscopy (STEM), including atomic-resolution imaging as well as elemental mapping by X-ray energy-dispersive spectroscopy (XEDS). We performed chemical mapping of atomic columns along <100>cubic to explore ordering in the B2-CsCl-type structure. We confirmed that Al8Mn5 is rhombohedral with the D810-Al8Cr5 structure type and R3m space group at the atomic scale. We also imaged the B2/Al8Mn5 interface to better understand the orientation relationship and atomic coherency between B2/Al8Mn5. We observed the interface of {2-201} twin boundaries along <1-102> with distinguished atomic-resolution.

Comparative Study of Structure Property Relationship of Extruded and Additively Manufactured WE43: Ramesh Raghavendra1; Prathviraj Upadhyaya1; Sinead O'Halloran1; Oliver Mccarthy2; Triona Kennedy2; 1Waterford Institute of Technology; 2Stryker Ireland
     In recent years, bioresorbable materials have been considered as a viable option to replace temporary orthopaedic implants. Temporary orthopaedic implants are required for a relatively short time, just long enough to let bones heal. They are removed, during a second surgery. Bioresorbable materials eliminate the requirement for that invasive surgery.WE43 Magnesium alloy is a low density, biocompatible, metallic structure, which has mechanical properties similar to that of human cortical bone, which will biodegrade and absorbed by the body. Additive manufacturing (AM) can be used to produce implants with complex design providing new functionality compared with traditional manufacturing techniques. AM processing parameters for WE43 have been developed in this study and their relationship to component microstructural and mechanical properties investigated. Comparison to conventionally produced extruded WE43 is presented. Structure-property relationships obtained for both the manufacturing techniques were compared. This research is aimed at development of additively manufactured, bioresorbable magnesium implants.