12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Fundamental Research
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
Friday 8:00 AM
June 18, 2021
Room: Plenary
Location: Virtual
Session Chair: Sean Agnew, University of Virginia
8:00 AM Plenary
Accelerating Predictive Understanding of Microstructural Evolution and Mechanical Behavior of Magnesium Alloys: John Allison1; 1University of Michigan
The Center for PRedictive Integrated Structural Materials Science (PRISMS) is creating and disseminating a unique open-source capability for accelerating the scientific understanding of magnesium alloys. A central component of this framework is a suite of high performance, open-source multi-scale computational tools for predicting microstructural evolution and mechanical behavior. These are used in conjunction with advanced experiments in integrated scientific “Use Cases” focused on topics such as predicting the evolution of precipitates in Mg-rare earth alloys, their subsequent influence on mechanical behavior and quantification of alloying effects on the evolution of deformation twins during monotonic and cyclic loading. A third thrust is providing this information to the community via an information repository called the Materials Commons. This talk will review the Center’s progress and plans.
8:30 AM Plenary
Dislocation-particle Interactions in Magnesium Alloys: Maria Teresa Perez Prado1; 1IMDEA Materials Institute
Precipitation constitutes a microstructural design tool that has been utilized successfully to strengthen metals such as, for example, aluminum alloys and nickel superalloys. However, particle hardening has proven significantly less effective in magnesium, thus severely limiting the possibilities for structural alloy design. Exploiting the hardening potential of precipitates in magnesium alloys requires a profound understanding of the interaction between dislocations and precipitates. Basal dislocations are usually the main strain carriers, although non-basal slip systems may also become active and play a key role. The relative contribution of each mechanism depends on testing conditions, composition, microstructure and texture. This lecture will review recent research on dislocation-particle interactions in magnesium alloys using a combined approach including micromechanical testing, slip trace analysis, and high resolution transmission electron microscopy. The interaction of basal and non basal dislocations with particles of different sizes and orientations with respect to the matrix will be discussed.
9:00 AM Plenary
Effects of Interfaces on Deformation Twinning Behavior at the Mesoscale: Irene Beyerlein1; 1University of California, Santa Barbara
There are a wide range of structural applications that desire advanced materials with high strength-to-weight ratios in combination with other outstanding mechanical properties. Mg alloys offer a potential solution, but successful incorporation of Mg alloys into engineering designs is, however, hindered by their limited plasticity. One of the important and puzzling underlying mechanisms governing their plastic behavior is deformation twinning, which form in these materials under straining. The development of twins both inside the crystal and at crystalline interfaces has mostly been addressed at the atomistic scale level. In our research, we employ crystal plasticity-based micromechanics model to establish and understand the effects of material interfaces, whether they arise from free surfaces, grain boundaries, phase boundaries, or precipitates, on the expansion of twin embryos, twin-tip propagation and twin boundary migration. In this talk, recent results from a number of modeling and experimental studies will be presented and discussed.