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Dong Nyung Lee

Bio: Dong Nyung Lee is an academic researcher from Seoul National University. The author has contributed to research in topics: Recrystallization (metallurgy) & Annealing (metallurgy). The author has an hindex of 38, co-authored 205 publications receiving 5500 citations. Previous affiliations of Dong Nyung Lee include Center for Advanced Materials & Pohang University of Science and Technology.


Papers
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Journal ArticleDOI
TL;DR: In this article, a study has been made of the spontaneous growth of tin whiskers from tin electrodeposits on a phosphor bronze sheet, and the driving force for the evolution of tin worms is a biaxial compressive stress of about 8 MPa developed in tin deposits by the formation of an intermetallic compound of Cu 6 Sn 5, especially in grain boundaries of tin films.

418 citations

Journal ArticleDOI
TL;DR: In this article, the influence of Ti addition on the development of acicular ferrite microstructure during the γ/α transformation in C-Mn steels has been studied.

290 citations

Journal ArticleDOI
TL;DR: In this paper, a local Mn-depleted zone (MDZ) has been observed to develop in the vicinity of the steel-Ti2O3 interface, which is believed to be a dominant driving force for the heterogeneous nucleation of intragranular ferrite.

221 citations

Journal ArticleDOI
TL;DR: In this paper, the potency of various inclusions and precipitates such as SiO 2, MnO·SiO 2, MnS, Al 2 O3, Ti 2 O 3 and VN for the nucleation of intragranular ferrite has been examined.

216 citations

Journal ArticleDOI
TL;DR: In this article, the Gibbs energies of individual phases in the Cu-Sn system have been modelled employing the regular solution type model and the two-sublattice model, and a set of selfconsistent model parameters has been obtained taking into account phase equilibria and thermodynamic information available in literature.
Abstract: A thermodynamic assessment of the Cu-Sn system has been carried out using the CALPHAD method. The Gibbs energies of individual phases in the system have been modelled employing the regular solution type model and the two-sublattice model. A set of self-consistent model parameters has been obtained taking into account phase equilibria and thermodynamic information available in literature. The measured phase diagram and thermodynamic quantities were satisfactorily reproduced with the optimized model parameters. (orig.)

200 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a review examines recent developments related to the use of ECAP for grain refinement including modifying conventional ECAP to increase the process efficiency and techniques for up-scaling the procedure and for the processing of hard-to-deform materials.

3,669 citations

01 Sep 1955
TL;DR: In this paper, the authors restrict their attention to the ferrites and a few other closely related materials, which are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present.
Abstract: In this chapter, we will restrict our attention to the ferrites and a few other closely related materials. The great interest in ferrites stems from their unique combination of a spontaneous magnetization and a high electrical resistivity. The observed magnetization results from the difference in the magnetizations of two non-equivalent sub-lattices of the magnetic ions in the crystal structure. Materials of this type should strictly be designated as “ferrimagnetic” and in some respects are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present. We shall not adhere to this special nomenclature except to emphasize effects, which are due to the existence of the sub-lattices.

2,659 citations

Journal ArticleDOI
TL;DR: The current understanding of the fundamentals of recrystallization is summarized in this paper, which includes understanding the as-deformed state, nucleation and growth, the development of misorientation during deformation, continuous, dynamic, and geometric dynamic recystallization, particle effects, and texture.
Abstract: The current understanding of the fundamentals of recrystallization is summarized. This includes understanding the as-deformed state. Several aspects of recrystallization are described: nucleation and growth, the development of misorientation during deformation, continuous, dynamic, and geometric dynamic recrystallization, particle effects, and texture. This article is authored by the leading experts in these areas. The subjects are discussed individually and recommendations for further study are listed in the final section.

1,797 citations

Journal ArticleDOI
Abstract: This article presents an overview of the developments in stainless steels made since the 1990s. Some of the new applications that involve the use of stainless steel are also introduced. A brief introduction to the various classes of stainless steels, their precipitate phases and the status quo of their production around the globe is given first. The advances in a variety of subject areas that have been made recently will then be presented. These recent advances include (1) new findings on the various precipitate phases (the new J phase, new orientation relationships, new phase diagram for the Fe–Cr system, etc.); (2) new suggestions for the prevention/mitigation of the different problems and new methods for their detection/measurement and (3) new techniques for surface/bulk property enhancement (such as laser shot peening, grain boundary engineering and grain refinement). Recent developments in topics like phase prediction, stacking fault energy, superplasticity, metadynamic recrystallisation and the calculation of mechanical properties are introduced, too. In the end of this article, several new applications that involve the use of stainless steels are presented. Some of these are the use of austenitic stainless steels for signature authentication (magnetic recording), the utilisation of the cryogenic magnetic transition of the sigma phase for hot spot detection (the Sigmaplugs), the new Pt-enhanced radiopaque stainless steel (PERSS) coronary stents and stainless steel stents that may be used for magnetic drug targeting. Besides recent developments in conventional stainless steels, those in the high-nitrogen, low-Ni (or Ni-free) varieties are also introduced. These recent developments include new methods for attaining very high nitrogen contents, new guidelines for alloy design, the merits/demerits associated with high nitrogen contents, etc.

1,668 citations

Journal ArticleDOI
18 Nov 2011-Science
TL;DR: A route is developed for fabricating extremely low-density, hollow-strut metallic lattices that exhibit complete recovery after compression exceeding 50% strain, and energy absorption similar to elastomers and attribute these properties to structural hierarchy at the nanometer, micrometer, and millimeter scales.
Abstract: Ultralight (<10 milligrams per cubic centimeter) cellular materials are desirable for thermal insulation; battery electrodes; catalyst supports; and acoustic, vibration, or shock energy damping. We present ultralight materials based on periodic hollow-tube microlattices. These materials are fabricated by starting with a template formed by self-propagating photopolymer waveguide prototyping, coating the template by electroless nickel plating, and subsequently etching away the template. The resulting metallic microlattices exhibit densities ρ ≥ 0.9 milligram per cubic centimeter, complete recovery after compression exceeding 50% strain, and energy absorption similar to elastomers. Young’s modulus E scales with density as E ~ ρ^2, in contrast to the E ~ ρ^3 scaling observed for ultralight aerogels and carbon nanotube foams with stochastic architecture. We attribute these properties to structural hierarchy at the nanometer, micrometer, and millimeter scales.

1,412 citations