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Online since: April 2009
Authors: Katsuyoshi Kondoh, Thotsaphon Threrujirapapong, Junko Umeda, Hisashi Imai, Bunshi Fugetsu
A mean grain size of P/M Ti materials with CNTs and no CNT is around
6μm and 5μm, respectively, and no significant difference between them is observed.
Number of test specimens, N=3 Materials UTS / MPa YS / MPa Elongation (%) P/M extruded pure titanium 585 423 29.7 P/M extruded TMC with CNTs 742 592 26.0 Conclusions Wet process using the zwitterionic surfactant solutions was effective to coat un-bundled CNTs on Ti powder surface, and assemble them in P/M extruded titanium composite.
Number of test specimens, N=3 Materials UTS / MPa YS / MPa Elongation (%) P/M extruded pure titanium 585 423 29.7 P/M extruded TMC with CNTs 742 592 26.0 Conclusions Wet process using the zwitterionic surfactant solutions was effective to coat un-bundled CNTs on Ti powder surface, and assemble them in P/M extruded titanium composite.
Online since: September 2008
Authors: Eugene Zakar, D. Wikner, Paul Amirtharaj, Madan Dubey
Introduction
The capability of MMW signals to penetrate obscurants has been well understood for a number of
years, but fabrication of a real-time passive MMW imager in a cost effective system has been very
challenging.
Figure 1 shows predominantly c-axis peaks of the individual material layers, while no a-axis oriented grains or domains were observed in the YBCO film implying excellent and uniform quality epitaxial grown materials.
Figure 1 shows predominantly c-axis peaks of the individual material layers, while no a-axis oriented grains or domains were observed in the YBCO film implying excellent and uniform quality epitaxial grown materials.
Online since: March 2007
Authors: Young Joo Oh, Eun Young Kang, Ji Hye Kim, Young Su Ji, Chang Woo Lee, Kyung Tae Hong, Myoung-Ryul Ok
Nowadays, an
increasing number of studies are focused on Mg and Ti.
From the in-plane view of the Ti substrate/oxide composite, it can be remarkable that the size of the grain is very fine.
From the in-plane view of the Ti substrate/oxide composite, it can be remarkable that the size of the grain is very fine.
Online since: May 2010
Authors: Waldemar Wołczyński, Borys Mikułowski, Grzegorz Boczkal
The main purpose of the work was to elaborate of a method allowing to control numbers and
morphology of the second intermetallic phase in the Zn-Cu-Ti single crystals and in consequence
possibilities to produce structures with precisely defined properties.
After crossing this critical rate, the resulting structure were columnar grains elongated in the growth direction.
After crossing this critical rate, the resulting structure were columnar grains elongated in the growth direction.
Online since: May 2017
Authors: Natalia Stankiewicz, Michał Bołtryk
Thickness of the TPL and the amount of cement for the preparation of fine-grained concrete were optimized, see Tab. 1.
Tab. 2 The experimental plan Series number Coded values values Actual values Coded values X1 X2 X1 X2 1 -1 -1 15 360 7 0 -1 30 360 3 1 -1 45 360 4 -1 0 15 500 5 0 0 30 500 6 1 0 45 500 7 -1 1 15 640 8 0 1 30 640 9 1 1 45 640 10 Control sample Samples preparation and test methods Concrete mixes were prepared according to the previously developed technology in laboratory mixer.
Tab. 2 The experimental plan Series number Coded values values Actual values Coded values X1 X2 X1 X2 1 -1 -1 15 360 7 0 -1 30 360 3 1 -1 45 360 4 -1 0 15 500 5 0 0 30 500 6 1 0 45 500 7 -1 1 15 640 8 0 1 30 640 9 1 1 45 640 10 Control sample Samples preparation and test methods Concrete mixes were prepared according to the previously developed technology in laboratory mixer.
Online since: June 2003
Authors: Faina Muktepavela, J. Maniks
However, investigations of the
boundary properties and accommodation processes in the bulk of the fine-grained material are
hindered by the experimental difficulties.
The brittleness of the interface indicates the accumulation of a large number of stable defects such as microcracks on the interfaces after plastic deformation.
The brittleness of the interface indicates the accumulation of a large number of stable defects such as microcracks on the interfaces after plastic deformation.
Online since: January 2010
Authors: Noé Cheung, Maria Clara F. Lerardi, M.S.F Lima, M.A. Larosa, Wislei R.R. Osório, Amauri Garcia
.
(4)
where n = number of time interval iterations (t); k = thermal conductivity of solid state if the nodal
temperature is below the fusion temperature; k = effective thermal conductivity (keff) if the nodal
temperature is above the fusion temperature.
At high scanning speed during LSR of 304 AISI samples, which is the case of the present work, Akgun and Inal [16] reported in their work that because dendritic growth follows substrate grain direction, dendrites can reach the surface with no or minimum disruption by their neighbors, thus resulting in a more uniformly oriented structure.
At high scanning speed during LSR of 304 AISI samples, which is the case of the present work, Akgun and Inal [16] reported in their work that because dendritic growth follows substrate grain direction, dendrites can reach the surface with no or minimum disruption by their neighbors, thus resulting in a more uniformly oriented structure.
Online since: January 2010
Authors: Athanasios K. Stubos, Sofoklis S. Makridis, Albert Prodan, Erik Zupanič, A. Ioannidou, E.S. Kikkinides
Table 1: Space Groups, Atomic positions (Wyckoff positions), number of formula unit per unit
cell (Z) in MgZn2 and MgCu2 type of structures.
The measurement has been performed at 30 oC after activation at 150 o C (vacuum before measurement) to obtain activated grains.
The measurement has been performed at 30 oC after activation at 150 o C (vacuum before measurement) to obtain activated grains.
Online since: October 2010
Authors: Erika Iveth Cedillo González, Anabel Álvarez Méndez, Juan Jacobo Ruiz Valdés
Glass-ceramics are fine-grained polycrystalline materials formed through the nucleation and controlled crystallization of a glass of a suitable composition [1].
This behavior can be explained analyzing Eq. 3, that shows the relationship between the Tp from the DTA and N, the number of nuclei per volume unit in a glass [11]: ln N = mEa/RTp + cte (3) where m is the dimensionality of the crystal growth.
This behavior can be explained analyzing Eq. 3, that shows the relationship between the Tp from the DTA and N, the number of nuclei per volume unit in a glass [11]: ln N = mEa/RTp + cte (3) where m is the dimensionality of the crystal growth.