A5066432416- High Entropy Alloys Studies
- High-Temperature Coating Behaviors
- Additive Manufacturing Materials and Processes
- Metallic Glasses and Amorphous Alloys
- Metallurgy and Material Forming
- High Temperature Alloys and Creep
- Microstructure and Mechanical Properties of Steels
- Advanced materials and composites
- Aluminum Alloy Microstructure Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Intermetallics and Advanced Alloy Properties
- Metal Alloys Wear and Properties
- Microstructure and mechanical properties
- Additive Manufacturing and 3D Printing Technologies
- Glass properties and applications
- Hydrogen Storage and Materials
- Metal Forming Simulation Techniques
- Titanium Alloys Microstructure and Properties
- Electromagnetic wave absorption materials
- Advanced Materials Characterization Techniques
- Ammonia Synthesis and Nitrogen Reduction
- Engineering Applied Research
- Material Properties and Applications
Korea Institute of Materials Science
2016-2025
Pusan National University
2002-2013
Korea Institute of Machinery and Materials
1997-2009
Harbin Institute of Technology
2006
In situ neutron diffraction experiments have been performed under loading in cast-wrought (CW) and additively manufactured (AM) equiatomic CoCrNi medium-entropy alloys. The line profile analysis correlated the faulting-embedded crystal structure to dislocation density, stacking/twin fault probability, stacking energy as a function of strain. results showed initial density 1.8 × 1013 m−2 CW 1.3 1014 AM. It significantly increased up 1015 1.7 AM near fracture. contributed flow stress 470 MPa...
In this study, we produced both homogeneous and heterogeneous-structured 316L austenitic stainless steels (SSs), each exhibiting comparable levels of yield strength (YS). Despite their similar YS, the SS exhibits a significantly higher tensile ∼ 1 GPa compared to homogeneous-structured (∼832 MPa), slightly fracture strain. The enhanced work hardening behavior in were mainly attributed hetero-deformation induced (HDI) hardening, accelerated deformation-induced martensitic transformation...
This study investigates the effects of welding velocity on weldability dissimilar cast/rolled high-entropy alloys and applicability cryogenic temperatures. Cast HEA side weld metal (WM) indicates a larger dendrite packet arm spacing (DAS) than rolled WM. Size difference is associated with epitaxial growth from each base (BM). As increases (6–10 m min−1), shrinkage voids DASs decreases. Dissimilar welds show tensile properties comparable to cast BM, where there are fractures welds. Cryogenic...
The FCC structured CoCrFeMnNi high entropy alloy (HEA) has attracted great attention due to its excellent ductility and strain hardening ability, but the lowest yield strength is insufficient for structural applications. To achieve ductility, we developed a new strategy called harmonic structure (HS) consisting of soft coarse hard fine grains via controlled mechanical milling time. SEM EBSD microscopic characterizations reveal that formation HS from surface interior powder difference in...