Publications
Showing 70 results for Author: Dongwon Shin
Aug, 2025
Journal
Physics-coupled Data-driven Design of High-Temperature Alloys
We present a materials design loop, which streamlines physics-coupled machine learning (ML) surrogate models to discover new alloy chemistries with improved properties. The efficacy is demonstrated by discovering a high-temperature alumina-forming austenitic (AFA) stainless steel with enhanced creep, followed by experimental validation. The ML models have been trained usin…
Apr, 2025
Journal
Effect of Sn microalloying on the nucleation of L12 Al3Zr precipitates in a dilute aluminum-zirconium alloy
While L12-Al3Zr nanoprecipitates provide a balance between strengthening and good electrical conductivity, the precipitation of L12-Al3Zr in aluminum requires aggressive heat treatments. An improved age-hardening response was observed during isochronal aging of an Al-0.24Zr (wt%) alloy when microalloyed with Sn. A new mechanism termed Low melting point Element-Assisted Nuc…
Oct, 2024
Journal
The many faces of θ’-Al2Cu precipitates: Energetics of pristine and solute segregated Al/θ’ semi-coherent interfaces
θ'-Al2Cu precipitates in Al-Cu alloys have various distorted octagon shapes, which can be explained by the competition between {100} and {110} type semi-coherent interfaces with the Al matrix. While most prior studies on the semi-coherent Al/θ' interfaces have focused on the {100} orientation, little is known about the {110} interface. We have investigated the energetics o…
Aug, 2024
Conference Paper
Low-Temperature Nucleation Behavior of L12 Al3Zr Precipitates in a Dilute Al-Zr-Sn Alloy
Jun, 2024
Journal
Effect of microalloying additions on microstructural evolution and thermal stability in cast Al-Ni alloys
Enhancement of thermal stability in Al-Ni alloys through microalloying with slow-diffusing elements, specifically Zr, has been previously reported which is attributed to Zr segregation at the Al/Al3Ni interface. In this study, we explore the influence of microalloying Al-Ni alloys with Zr, Ti, V, and Fe on microstructural evolution, hardness, and electrical and thermal con…
Dec, 2023
Journal
Interpreting Electrochemical and Chemical Sodiation Mechanisms and Kinetics in Tin Antimony Battery Anodes Using in Situ Transmission Electron Microscopy and Computational Methods
Intermetallic compounds such as SnSb are promising anode materials for sodium ion batteries; however, their nanoscale sodiation mechanisms are not well understood. Here, we used a combination of in situ transmission electron microscopy (TEM), first-principles electronic structure calculations, computational thermodynamic modeling, and phase-field simulations to reveal the…
Dec, 2023
Conference Paper
Cyclic Oxidation Behavior of Ni-Cr Alloys in Wet Air (C2018-11233)
For automotive exhaust valve applications, future vehicles will need durable materials operating at higher temperatures. Both commercial and model Ni-based alloys were tested in 1-h cycles at 800-950°C in wet air, and the oxide scales formed on wrought Ni-(14-25)wt%Cr binary alloys were characterized to fundamentally understand the behavior of chromia-forming alloys. The m…
Nov, 2023
Journal
Primary solidification of ternary compounds in Al-rich Al–Ce–Mn alloys
Primary solidification of ternary compounds Al20Mn2Ce and Al10Mn2Ce were analyzed through the coupling of the thermodynamic modeling and classic nucleation theory. Thermodynamic models of Al20Mn2Ce and Al10Mn2Ce were developed using the CALPHAD approach based on first-principles calculated enthalpy of formation and experimental data obtained from this work and the literatu…
Nov, 2023
Journal
Aging behavior and strengthening mechanisms of coarsening resistant metastable θ’ precipitates in an Al–Cu alloy
An Al–Cu alloy micro-alloyed with Mn and Zr (ACMZ) was examined to understand the thermal stability and strengthening mechanism of metastable θ'-Al2Cu precipitates with interfacial segregation after prolonged thermal exposure. The microstructure was characterized at multiple scales with techniques including synchrotron x-ray diffraction, scanning electron microscopy, scann…
Nov, 2023
Journal
Machine Learning for Thermal Transport Analysis of Aluminum Alloys with Precipitate Morphology
A large number of microstructural parameters and a wide range of transport physics impose challenges on thermal transport analysis of alloy. Herein, modern data science techniques are employed to overcome the challenges, pursuing effective calculation of thermal transport properties. This emerging approach is tested for precipitate‐hardened aluminum (Al) alloy with conside…