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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Magnesium Technology 2018
Presentation Title Solute/Stacking Fault Energies in Mg and Implications for Ductility
Author(s) Binglun Yin, Zhaoxuan Wu, William Curtin
On-Site Speaker (Planned) William Curtin
Abstract Scope Mg is the lightest structural metal but with low ductility due to the strong plastic anisotropy and fast pyramidal-basal (glissile-sessile) transitions of <c+a> dislocations. Alloying generally improves Mg ductility. Especially, Mg-3wt.%RE (RE=Y, Tb, Dy, Ho, Er) show significantly enhanced ductility compared to Mg-Al-Zn commercial alloys. To investigate possible ductilization mechanisms and the special roles of RE solutes, first-principles calculations are used to compute all relevant stacking fault (SF) energies as a function of solute type (Y, Al, Zn) and concentration in the dilute limit. Results show that the effect of dilute Y solutes on any individual SF energy can be achieved by Al or Zn at similar or moderately higher concentrations, which does not support existing concepts related to I1 SF. Moreover, Y solutes have limited influence on the energetics of the undesirable pyramidal-basal transition. Other possible concepts for the mechanism(s) of enhanced ductility are then discussed.
Proceedings Inclusion? Planned:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Acoustic Emission Study of High Temperature Deformation of Mg-Zn-Y Alloys with LPSO Phase
Adding Dimensions to the Immersion Testing of Magnesium Corrosion
C-59: A Microtomography Analysis of Damage and Fracture in Notched AZ31
C-60: Combustion of Regolith/Magnesium Mixtures for the Fabrication of Construction Materials on the Moon and Mars
C-61: Deformation Mechanism of a Mg-Zn-Y Alloy Containing Large Long-period-stacking-ordered Structures under Shock Wave
C-62: Deformation Processing of AZ31 and ZK60 Using a Novel Tube-equal Channel Angular Pressing (t-ECAP) Technique
C-63: Deformation Twinning in Shock Compressed UFG Mg
C-65: Effect of Confined Rolling on Microstructure and Mechanical Properties of Magnesium Alloys
C-66: Effect of Heat Treatment on the Grain Growth Kinetics and Mechanical Properties in Shear Assisted Processing and Extrusion (ShAPETM) ZK60 Tube
C-68: Effects of Ageing Treatment on the Microstructure and Mechanical Properties of Mg-Li Based Alloys
C-69: Evolution of Microstructure and Mechanical Properties during the Casting and Rolling of the ZEK100 Sheet
C-70: Hot Forging Behavior of Mg-8Al-4Ba-4Ca (ABaX844) Alloy and Validation of Processing Map
C-71: Influence of Hot Rolling on Microstructure and Mechanical Properties Thixo-Casts Obtained from Mixed E21 and WE43 Magnesium Granules
C-72: Interaction of Glide Dislocations with Extended Precipitates in Mg-Nd Alloys
C-74: Microstructure and Mechanical Behavior of ECAP-processed Magnesium at the Ice-water Temperature
C-75: Microstructure and Mechanical Properties of Magnesium-metal Laminated Nanocomposites
C-77: Rate and Temperature Dependent Deformation Behavior of WE43 Magnesium-rear Earth Alloy: Experiments and Crystal Plasticity Modeling
C-79: Understanding of Dynamic Recrystallization Characteristics of ZEK100 Magnesium Alloy Sheet during Warm Forming
Corrosion Characteristics of Two RE Containing Magnesium Alloys
Deformation and Recrystallization Mechanisms and their Influence on the Microstructure Development of Rare Earth Containing Magnesium Sheets
Developmentof BioMg 250 Bioabsorbable Implant Alloy
Dislocations in Mg Alloys with Rare-earth Element Addition
Effect of Ca on the Microstructure and Mechanical Properties in Mg Alloys
Effect of Fluoride Ion on the Microstructure and Properties of Permanganate Conversion Coating on AZ91D Magnesium Alloy
Empirical Examination of the Formation of Mechanical Properties of Heated Twin-roll-cast Magnesium Strips
Experimental Study of the Solidification Microstructure in the Mg-rich Corner of Mg-Al-Ce System
Fabrication of Mg(OH)2 by Electrolysis Using MgCl2 Aqueous Solution
In-situ Neutron Diffraction and Acoustic Emission during the Biaxial Loading of AZ31 Alloy
Influence of Low Temperature Forging on Microstructure and Low Cycle Fatigue Behavior of Cast AZ31B Mg Alloy
Influences of Yttrium Content on Microstructure and Mechanical Properties of As-cast Mg-Ca-Y-Zr Alloys
Investigation of Grain Refinement Method for AZ91 Alloy using Carbide Inoculation
Investigations on Microstructure and Mechanical Properties of Non-flammable Mg-Al-Zn-Ca-Y Alloys
Material Design for Enhancing Toughness of Mg Alloy and Application for Biodegradable Devices
Measurement of Twin Formation Energy Barriers Using Nudged Elastic Band Molecular Statics
Mechanical Properties of Thermo-mechanically Treated Extruded Mg-Zn-based Alloys
Mg Alloys: Challenges and Achievements in Controlling Performance, and Future Application Perspectives
Microstructure and Mechanical Properties of Mg-7.71Gd-2.39Nd-0.17Zr Alloy after the Different Heat Treatments
Microstructure, Mechanical Properties and Deformation Behavior of Mg-Gd-Y-Zn-Zr Alloy
Ni-P-MWNTs Composite Coatings on Magnesium Alloys AZ31 Part 1: MWNTs Content in Coating
Ni-P-MWNTs Composite Coatings on Magnesium Alloys AZ31 Part 2: Tribological Behavior and MWNTs Content in Coating
Recent Developments in Magnesium Alloy Corrosion Research
Solute/Stacking Fault Energies in Mg and Implications for Ductility
Strain Heterogeneity Structures in Wrought Magnesium AZ31 under Reversed Loading
Strengthening and Toughening Behaviors of the Mg-9Al Alloy Containing Oxygen Atoms
Strengthening of a Biodegradable Mg-Zn-Ca Alloy ZX50 after Processing by HPT and Heat Treatment
Study on Metal Smelting Process under Microwave Irradiation
Study on the Production of Metallic Magnesium from Nickel - Containing Serpentine
Superplasticity in a Chip-consolidated Mg97Zn1Y2 Alloy with LPSO Phase
Surface and interfacial energies of Mg17Al12-Mg system
Technological Solutions to Apply Magnesium Bulk Materials in Dynamic Bending and Axial Compression Load Cases
The Effect of Initial Texture on Deformation Behaviors of Mg Alloys under Erichsen Test
The Morphology and Distribution of Al8Mn5 in High Pressure Die Cast AM50 and AZ91
The Recrystallization and Grain Growth Behavior of Unalloyed Mg and a Mg-Al Alloy
Thermo-mechanical Treatment of Extruded Mg-1Zn Alloy: Cluster Analysis of AE Signals
Thermogravimetric Analysis of Simultaneous Decomposition and Formation of MgB2
Towards Active Corrosion Protection of Mg Alloys Using Corrosion Inhibition Approaches
Twin-slip Interaction at Low Stress Stage Deformation in an AZ31 Mg Alloy

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