2023 Technical Division Student Poster Contest: LMD 2023 Technical Division Graduate Student Poster Contest
Program Organizers: TMS Administration
Monday 5:30 PM
March 20, 2023
Room: Exhibit Hall G
Location: SDCC
Cancelled
SPG-14: Mechanical Properties of Laser Fabricated and Arc Melted AlCuFeNiSi High Entropy Alloy for Energy Storage Applications: Comparative Study: Modupeola Dada1; Patricia Popoola1; Evlly Mtileni1; 1Tshwane University of Technology
Traditional fabrication technique such as Arc melting was used to fabricate High entropy alloys, however, arc melting has challenges such as shape distortions, melted ingot may not be fully molten, uncertainties in the operation process and extensive wear and tear of the equipment, hence the use for advanced manufacturing techniques like the laser fabrication technique. This comparative study investigates the microstructural, mechanical, tribological and electrochemical properties of AlCuFeNiSi high entropy alloys fabricated via arc melting and laser metal deposition for energy storage applications. The results showed that the properties of the laser-deposited alloys were about 5 % higher than the arc melted alloys attributed to the rapid solidification rate, the solid solution structures and the high entropy alloy core effect. Hence, arc melting is suitable for alloy development while the laser metal deposition technique is significant in the development of structural materials for energy storage applications.
SPG-15: Transition Mechanism for the Metastable Phases in Al-Zn-Mg Alloys: A Novel Molecular Dynamics Approach: Yu-ning Chiu1; Chung-yi Yu2; Shih-kang Lin1; 1National Cheng Kung University; 2China Steel Corp, Aluminum Prod R&D Sect, New Mat R&D Dept
Metastable phases in Al-Zn-Mg based 7000 series aluminum alloys are the primary nanoscale precipitates that contribute most to their impressive mechanical properties. The “precipitation trajectory” for the metastable nanoprecipitates in this ternary system has been well acknowledged as follow: Super-saturated solid solution (SSSS) → Vacancy Rich Clusters (VRC), GP zones (GP I and II) → η' → η2. In this work, molecular dynamics (MD) simulations were implemented to show how compositional and structural evolution occurs during η'→η2 transition by vacancy-mediated diffusion. On this basis, a schematic phase transition mechanism and the corresponding energetics of η'→η2 transition are presented, which provides insight into the unrevealed precipitation kinetics of these metastable nanoprecipitates.