Experimental study of the planar-to-cellular transition during thin-film directional solidification: Observations of the long-time-scale dynamics of microstructure formation

1993 ◽  
Vol 47 (9) ◽  
pp. 4937-4952 ◽  
Author(s):  
J. T. C. Lee ◽  
R. A. Brown
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Directional Solidification ◽  
Time Scale ◽  
Microstructure Formation ◽  
Long Time

The Planar to Cellular Transition and the Long Time Scale Dynamics of Pattern Formation During Thin-Film Directional Solidification

1990 ◽  
Vol 205 ◽  
Author(s):  
John T.C. Lee ◽  
Robert A. Brown
Keyword(s):  
Thin Film ◽  
Spectral Analysis ◽  
Pattern Formation ◽  
Directional Solidification ◽  
Time Scale ◽  
Linear Stability Theory ◽  
Morphological Instability ◽  
Thin Sample ◽  
Long Time ◽  
Crystal Interface

AbstractExperimental observations of the melt/crystal interface in the directional solidification of a thin sample of a binary alloy are reported for conditions only slightly beyond those for the onset of morphological instability. Spectral analysis for long times shows dynamics leading to a band of most probable wavelengths with sharply selected peaks at wavelengths significantly below the most dangerous wavelength predicted by linear stability theory. These large-amplitude cells develop first in packets that spread to fill the interface.

Long-time-scale dynamics observed in directional solidification of a binary alloy

1994 ◽  
Vol 49 (18) ◽  
pp. 12724-12737 ◽  
Author(s):  
Konstantinos Tsiveriotis ◽  
Robert A. Brown
Keyword(s):  
Directional Solidification ◽  
Binary Alloy ◽  
Time Scale ◽  
Long Time

scholarly journals Modeling the Sputter Deposition of Thin Film Photovoltaics using Long Time Scale Dynamics Techniques

2011 ◽  
Vol 1327 ◽  
Author(s):  
S. Blackwell ◽  
R. Smith ◽  
S. D. Kenny ◽  
J. M. Walls
Keyword(s):  
Thin Film ◽  
Time Scale ◽  
Plasma Deposition ◽  
Kinetic Monte Carlo ◽  
Void Formation ◽  
Substrate Bias ◽  
Time Dynamics ◽  
Experimental Parameters ◽  
Long Time ◽  
Crystalline Growth

ABSTRACTResults are presented for modeling the deposition of Ag and rutile TiO2. The model can be used to examine the effect of varying experimental parameters, such as the substrate bias in the magnetron and the stoichiometry of the deposition species. We illustrate how long time scale dynamics techniques can be used to model the process over experimental time scales. Long time dynamics is achieved through an on-the-fly Kinetic Monte Carlo (otf-KMC) method, which determines diffusion pathways and barriers, in parallel, with no prior knowledge of the involved transitions. Using this otf-KMC method we have modeled the deposition of Ag and TiO2 for various plasma deposition energies, in the range 1 eV to 100 eV. It was found that Ag {111} produces the most crystalline growth when deposited at 40 eV. TiO2 growth showed that at energies of 1 eV and 100 eV a porous structure occurs with void formation. At deposition energies of 30 eV and 40 eV, a more dense and crystalline rutile growth forms. The results show that deposition energy plays an important role in the resulting thin film quality and surface morphology.

scholarly journals Long-Time-Scale Magnetization Ordering Induced by an Adsorbed Chiral Monolayer on Ferromagnets

ACS Nano ◽  
2021 ◽  
Author(s):  
I. Meirzada ◽  
N. Sukenik ◽  
G. Haim ◽  
S. Yochelis ◽  
L. T. Baczewski ◽  
...  
Keyword(s):  
Time Scale ◽  
Long Time

Experimental study of thin film Fe2O3/TiO2 for photocatalytic Rhodamine B degradation

2021 ◽  
pp. 108585
Author(s):  
Surangkana Wannapop ◽  
Asanee Somdee ◽  
Thiti Bovornratanaraks
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Rhodamine B

Experimental Study on the Failure Criterion for Brittle Materials in Compression

2011 ◽  
Vol 320 ◽  
pp. 259-262
Author(s):  
Xu Ran ◽  
Zhe Ming Zhu ◽  
Hao Tang
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Compressive Strength ◽  
Fracture Mechanics ◽  
Failure Criterion ◽  
Brittle Materials ◽  
Experimental Results ◽  
Experiment Study ◽  
Confining Stress ◽  
Theoretical Results

The mechanical behavior of multi-cracks under compression has become a very important project in the field of fracture mechanics and rock mechanics. In this paper, based on the previous theoretical results of the failure criterion for brittle materials under compression, experiment study is implemented. The specimens are square plates and are made of cement, sand and water, and the cracks are made by using a very thin film (0.1 mm). The relations of material compressive strength versus crack spacing and the lateral confining stress are obtained from experimental results. The experimental results agree well with the failure criterion for brittle materials under compression, which indicates that the criterion is effective and applicable.

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