Zobrazeno 1 - 10
of 2 939
pro vyhledávání: '"W.J. Kim"'
Publikováno v:
Journal of Magnesium and Alloys, Vol 12, Iss 1, Pp 316-331 (2024)
The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy (LAZ1011) with a grain size of 3.2 µm, primarily composed of the BCC β phase and a small amount of the HCP α phase, were examined in a t
Externí odkaz:
https://doaj.org/article/ee848e05888c4b219a48e717c007fb69
Publikováno v:
Journal of Materials Research and Technology, Vol 22, Iss , Pp 2704-2719 (2023)
Pure niobium (Nb) sheets were subjected to a special rolling process called HRCR, which combines high-ratio differential rolling (HRDSR), which is a severe-plastic-deformation rolling method, with cross rolling (CR). During HRCR, as the thickness red
Externí odkaz:
https://doaj.org/article/6453f12bd0534b9f84a287a1670e84f1
Autor:
H.T. Jeong, W.J. Kim
Publikováno v:
Journal of Magnesium and Alloys, Vol 10, Iss 10, Pp 2901-2917 (2022)
Samples of Mg-8.2Gd-3.8Y-1.1Zn-0.4Zr alloy with and without an intragranular lamellae-shaped long period stacking ordered (LPSO) phase were prepared through heat treatment and a series of hot compression tests on these materials were conducted to exa
Externí odkaz:
https://doaj.org/article/bafa7c94b27346d4b63c30752eff2ce2
Autor:
H.T. Jeong, W.J. Kim
Publikováno v:
Journal of Magnesium and Alloys, Vol 10, Iss 5, Pp 1133-1153 (2022)
The tensile elongation behavior and deformation mechanisms of superplastic Mg alloys and Mg composites were examined by extensively reviewing the literature published from the time of the first report on the superplasticity of Mg alloys to the presen
Externí odkaz:
https://doaj.org/article/bcb4fca1bddd40bc80a8f87e9abe208d
Publikováno v:
Journal of Materials Research and Technology, Vol 10, Iss , Pp 250-267 (2021)
In the present study, a porous Ti layer was deposited on the surface of a Co–Cr alloy using the directed energy deposition process, and the effects of the laser power and scan speed on the porosity, coating layer thickness, melt pool depth, contact
Externí odkaz:
https://doaj.org/article/4c08973e843646fd830ec75df1a52e65
Publikováno v:
International Journal of Infectious Diseases, Vol 101, Iss , Pp 306-311 (2020)
Objectives: The aim of this study was to estimate delay-adjusted case fatality rates (CFRs) for COVID-19 in South Korea, and evaluate how these estimates have evolved over time throughout the epidemic. Methods: Public data from the Korea Centers for
Externí odkaz:
https://doaj.org/article/bea8272a2e284951b96627ab702beb90
Autor:
W.J. Kim, H.T. Jeong
Publikováno v:
Journal of Materials Research and Technology, Vol 9, Iss 6, Pp 13434-13449 (2020)
In this study, the construction of processing maps was attempted using the constitutive creep equations for various high-temperature deformation mechanisms to predict the effect of processing parameters (temperature and strain rate), the material con
Externí odkaz:
https://doaj.org/article/5a1419d6526f4e3bb9b1ee88a8b7c428
Publikováno v:
Journal of Magnesium and Alloys, Vol 8, Iss 3, Pp 860-872 (2020)
In this study, carbon black (0, 0.01, 0.03 and 0.08 wt%) and AZ31 (Mg–3Al–1Zn) magnesium chips were used to fabricate carbon black-reinforced magnesium matrix composites with extrusion or a combination of extrusion and high-ratio differential spe
Externí odkaz:
https://doaj.org/article/deab3a99603c49a69756c3c1f7a774df
Autor:
W.J. Kim, H.T. Jeong
Publikováno v:
Journal of Materials Research and Technology, Vol 9, Iss 3, Pp 5134-5143 (2020)
A flow instability criterion developed based on a continuum model was found to be related to the onset of power law breakdown in creep deformation mechanisms. The currently proposed flow instability criterion based on power law breakdown (n > 7, wher
Externí odkaz:
https://doaj.org/article/f70dcca0a0784c608016fb2ca62b7aca
Publikováno v:
Journal of Materials Research and Technology, Vol 9, Iss 1, Pp 749-761 (2020)
The high-temperature compressive deformation behavior of a Cu-10 wt.% Sn solid solution alloy was studied in the temperature range of 843–993 K and in the strain rate range of 10−3 – 10 s−1 and the relationships among the flow stress, strain
Externí odkaz:
https://doaj.org/article/3203198235674088b9b65f1c680f5965