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Meeting	MS&T22: Materials Science & Technology
Symposium	Innovative Process Design and Processing for Advanced Structural Materials
Presentation Title	Atomic-scale Unique Interface Observation of η/Al in Al-Zn-Mg Alloy
Author(s)	Hwangsun Kim, Howook Choi, Juhyun Oh, Ho Kwon, Eun Soo Park, Sungwoo Lee, Gun-Do Lee, Miyoung Kim, Heung Nam Han
On-Site Speaker (Planned)	Hwangsun Kim
Abstract Scope	Al-Zn-Mg alloys have been widely used in automobile and aerospace industry due to its lightweight property and high strength. The main strengthening mechanism of Al-Zn-Mg alloy is known as precipitation hardening. The precipitation sequence has been reported as follows: Super-saturated solid solution → GP zones → η’ phase → η phase. Among the 15 differently oriented η precipitates, η<sub>1</sub>, η<sub>2</sub>, and η<sub>4</sub> have the highest proportion and the rest except for these are known to exist less than 1%. In this study, η<sub>4</sub> precipitates, which is mainly precipitated when heterogeneous nucleation occurs, were observed in atomic scale and it was confirmed that it has a pseudo-periodic step-like interfacial structure with Mg and Zn segregation. We compared the interface energy of simulated flat interface and experimentally observed unique interface using ab-initio calculation. Consequently, the unique interface was energetically favored.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A New Method for Measurement of Flow Stresses at High Strain Rates and Temperatures for Improved Simulation of Friction Stir Welding

A Study on Migrating Boundary Induced Plasticity Using Molecular Dynamics Simulation for Pure Iron

Atomic-scale Unique Interface Observation of η/Al in Al-Zn-Mg Alloy

Co-design of 3D Printing, Parts and Microstructure

Effects of Electric Current on the Plastic Deformation Behavior of Pure Copper, Iron, and Titanium

Electric Current-induced Phenomena in Materials

Enhancement of Mechanical Properties in Nanoporous Gold

Improvement of Mechanical Properties of Metallic Materials by Multilayered Structure

K--8: Effect of Heat Treatment in 9% Ni Steels on Cryogenic Impact Toughness

K-12: Improvement of Structural Stability and Characterization of Nanoscale Defects in Amorphous Alumina Thin Film

K-13: Integrated Welding and Thermal Processing for Ferritic/Martensitic Steels

K-14: MatILDa® - Application of a User-oriented Material Database

K-15: Porous Silicon Carbide (SiC) for Composite Core Sandwich Structures

K-16: Solid-state Bulk Joining of Dissimilar Metal Alloys by Electrically Assisted Pressure Joining

K-17: Study on the Behavior of Fine Particles by the Vibration of the Medium with Polluted Air Inside the Rigid Housing

K-18: The Friction and Product Quality in Dry Metal Forming with Volatile Media

K-2: Automated Process Design for Heat Shrink Casing of Welded Parts of Buried District Heating Pipe

K-4: Development of a Gradient Structural Material Using Electrically Assisted Pressure Joining of Fe-Mn-Al-C Lightweight Steels

K-5: Development of a Self-heated Composite Tool for Out of Autoclave and Out of Oven Cure of Thin Ply Composite Structures

K-6: Development of Highly Stretchable and Impermeable Encapsulation by Applying Wavy-structure to Thermally Grown Silicon Dioxide

K-7: Discontinuous Yielding Behavior Due to Twinning Accompanied by Abnormal Grain Growth in Fine-grained Copper

K-9: Enhanced Flaw-tolerance of Nanoporous Gold with Grain Boundary Plasticity

Manufacture of Advanced 3D Composites Using a New 3D Weaving Technique and Their Design Using a Neural Network

Mechanical Properties and Reliability of Nanolayered Stretchable Interconnect with Nanocrystalline Copper and Ternary Metallic Glass

Mechanisms Driving Defect Formation in High Power Laser Welding of Nickel Alloys

Microstructure-based Fatigue Life Modeling Methodology for Ferritic-pearlitic Hypo-eutectoid Steels

Modern Supercomputing for Accelerating the Design of High-temperature Aluminum Alloys

Monte Carlo Simulations for Microstructure Evolution via Diffusion

Novel Solid-State Metal Powder Fabrication Process for Feedstock of Metal Matrix Composites Additive Manufacturing

On the Micromechanical Response of a Mild Steel during Abrupt Strain Path Changes (SPCs)

Recent Nanoindentation Studies on Innovative Process Design for Advanced Structural Materials

Residual Stress in Steel H-beam Produced by Hot-rolling and QST Investigated by Instrumented Indentation Testing

Structural Evolution during Nanostructuring and Heating of an Additive-manufactured Stainless Steel Examined by X-ray and In-situ Neutron Diffraction Analyses

Uniaxial Tensile Behavior After Baking Treatment in a Low Carbon Steel Accompanying Inhomogeneous Plastic Yielding

Virtual Thermo-mechanical Process Design of Metallic Materials by Integrating Crystal Plasticity and Phase Field Model

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