12th International Conference on Magnesium Alloys and their Applications (Mg 2021): LPSO & MFS Structures 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
Thursday 9:50 AM
June 17, 2021
Room: Invited II
Location: Virtual
Session Chair: Yoshihito Kawamura, Kumamoto University
9:50 AM Invited
Disclination in Connecting Kink Bands Formed By Multiple Basal Slips: Tomonari Inamura1; Yuri Shinohara1; Ryutaro Matsumura1; 1Tokyo Institute of Technology
The geometry of the kink band formed by multiple basal slips was formulated and the connection between the kink bands was examined using rank-1 connection. We proved that any two kink bands formed by any multiple basal slips can be rank-1 connected to each other. In addition to the wedge disclination, a mixed disclination at the junction of the two kink bands was found. The three-dimensional morphology of the connecting kink bands was sensitive to the mixing ratio of the basal slips in each kink band. Origin of the complexity of the kink microstructure is discussed based on the energy of disclinations that is inevitably formed in the connecting kink bands.
10:20 AM Invited
Highstrength Ductile Rapidly Solidified Mg-Zn-Y Alloys with Low Amount of LPSO Phase: Daria Drozdenko1; Michiaki Yamasaki2; Kristián Máthis1; Patrik Dobroň1; Pavel Lukáč1; Naoya Kizu2; Shin-ichi Inoue2; Yoshihito Kawamura2; 1Charles University; 2Kumamoto University
The present work is aimed at investigating dilute Mg-Zn-Y alloys prepared by the consolidation of rapidly solidified ribbons. The effect of the minor variation in composition (particularly, Zn and Y vary between 1-2 at. %) and the metal flow rate during extrusion (as a part of processing procedure) on the microstructure and resulting mechanical properties has been studied. Alloys have bimodal microstructure including non- and dynamically recrystallized grains with an overall average grain size of 1 µm. Mechanical performance is correlated to characteristics of the microstructure, such as dispersion of Zn- and Y-rich stacking faults and LPSO phase, grain size, etc. Inhomogeneous internal strain distribution in the bimodal microstructure was found to be of key importance. Digital image correlation technique was used to characterize the yielding behavior in detail. The investigated alloys have shown comparable tensile properties to the world record holders - Mg-Zn-Y alloys prepared by powder metallurgy.