Autor: Kawasaki, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Evolution Of Precipitate Morphology During Extrusion In Mg ZK60A Alloy
Ewolucja morfologii wydzieleń podczas wytłaczania stopu Mg ZK60A
Autorzy:: Park, J.
Jung, K. H.
Lee, G. A.
Kawasaki, M.
Ahn, B.
Powiązania:: https://bibliotekanauki.pl/articles/356233.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: magnesium alloy
ZK60A
precipitation
extrusion
stopy magnezu
wydzielenia
wytłaczanie
Opis:: In this study, a continuously casted ZK60A magnesium alloy (Mg-Zn-Zr) was extruded in two different extrusion ratios, 6:1 and 10:1. The evolution of precipitates was investigated on the two extruded materials and compared with that of as-casted material. The microstructural analysis was performed by electron backscatter diffraction and transmission electron microscopy, and the compositional information was obtained using energy-dispersive X-ray spectroscopy. Several distinct morphologies of precipitates were observed, such as dot, rod, and disk shaped. The formation mechanisms of those precipitates were discussed with respect to the heat and strain during the extrusion process.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 2B; 1423-1426
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Developing Superplasticity in Ultrafine-Grained Metals
Autorzy:: Kawasaki, M.
Langdon, T.
Powiązania:: https://bibliotekanauki.pl/articles/1402058.pdf
Data publikacji:: 2015-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Bx
81.20.Hy
81.40.Lm
Opis:: The processing of bulk metals through the application of severe plastic deformation provides an opportunity for achieving exceptional grain refinement with grain sizes typically lying in the submicrometer or even the nanometer range. Provided these small grains are reasonably stable at elevated temperatures, these ultrafine-grained metals will exhibit excellent superplastic properties when pulled in tension at elevated temperatures. Most ultrafine-grained materials have been produced using either equal-channel angular pressing or high-pressure torsion. This paper examines the results for superplasticity reported to date using metallic alloys processed by equal-channel angular pressing and high-pressure torsion, compares the experimental strain rates with those predicted using the theoretical model for conventional superplastic flow and then demonstrates the feasibility of preparing deformation mechanism maps that provide comprehensive information on the flow mechanisms.
Źródło:: Acta Physica Polonica A; 2015, 128, 4; 470-478
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion
Płynięcie stopu magnezu ZK60A podczas wysokotemperaturowego odkształcenia w trakcie wytłaczania
Autorzy:: Kawasaki, M.
Lee, H. J.
Oh, M. C.
Ahn, B.
Powiązania:: https://bibliotekanauki.pl/articles/354374.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: activation energy
extrusion
flow mechanics
magnesium alloy
tensile property
energia aktywacji
wytłaczanie
mechanika przepływu
stop magnezu
rozciąganie
Opis:: Flow behavior of a ZK60A magnesium alloy after continuous casting and subsequent extrusion was examined in tension at a range of strain rates of 3.0×10^-6 − 1.0×10^-2 s^-1 at temperatures of 473-623K. The results demonstrated that the alloy exhibited a maximum elongation of ~250% at 523K when tested at an initial strain rate of 1.0×10^-5 s^-1 and strain rate sensitivity, m, of ~0.3-0.4 and the activation energy of ~94 kJ/mol were calculated under the testing conditions. The detailed investigation suggested that the high temperature flow of the ZK60A alloy having submicrometer grains demonstrates quasi-superplastic flow behavior controlled by a dislocation viscous glide process.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 2B; 1327-1330
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: An Evaluation of Homogeneity and Heterogeneity in Metals Processed by High-Pressure Torsion
Autorzy:: Figueiredo, R.
Kawasaki, M.
Langdon, T.
Powiązania:: https://bibliotekanauki.pl/articles/1418397.pdf
Data publikacji:: 2012-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.66.Bi
61.66.Dk
Opis:: Processing through the use of high-pressure torsion is attracting much attention at the present time because of the potential for achieving exceptional grain refinement. In principle, it appears that the thin disks used for high-pressure torsion processing should exhibit significant heterogeneity in the as-processed condition. However, experiments show that the development of homogeneity or heterogeneity is dependent upon the crystalline structure of the material. For high-purity aluminum the as-processed microstructure is very homogeneous after five or more revolutions of torsional straining but for the magnesium AZ31 alloy there is a considerable degree of heterogeneity in the as-processed disks.
Źródło:: Acta Physica Polonica A; 2012, 122, 3; 425-429
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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