Korea Advanced Institute of Science and Technology · Engineering
Professor Pyuck-Pa Choi's research lab specializes in advanced materials processing and microstructure characterization, with a focus on additive manufacturing of high-performance alloys and the formation mechanisms of complex intermetallic and long-period stacking ordered (LPSO) phases in magnesium and nickel-based superalloys. The lab investigates defect mitigation strategies such as hot cracking resistance in non-weldable alloys through alloying and microstructural engineering, employing advanced techniques like transmission electron microscopy (TEM) and atom probe tomography (APT) to probe atomic-scale composition and phase evolution. Current research directions include the development of crack-resistant superalloys and the design of high-strength, lightweight Mg-Gd-Zn-Zr alloys with tailored LPSO phases for structural applications.
Figures are computed from collected data and may differ slightly.
Additive manufacturing (AM) is an emerging new paradigm in the production of industrial parts since it allows the fabrication of near-net shape products directly from designs, which is impossible with conventional manufacturing techniques. However, hot cracking phenomena in AM are a critical issue with non-weldable alloys, rendering manufactured parts unusable. There are solutions to this problem, such as alloying Hf with non-weldable Ni-based superalloys to improve cracking resistibility. Altho
Herein, the evolution of long-period stacking ordered (LPSO) phases in the as-cast Mg-6Gd-1Zn-0.6Zr (wt.%) alloy are investigated via transmission electron microscopy (TEM) and atom probe tomography (APT). The TEM results reveal that two types of LPSO phase (a bulky interdendritic phase and a plate-like matrix LPSO phase) are formed in the as-cast sample. Most of the LPSO phases are confirmed to be of the 14H type, with a smaller proportion being of the 18R LPSO. Further, the APT results reveal
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