Strain-rate-sensitive mechanical response, twinning, and texture features of NiCoCrFe high-entropy alloy: Experiments, multi-level crystal plasticity and artificial neural networks modeling

2020 ◽  
Vol 845 ◽  
pp. 155911 ◽  
Author(s):  
T.J. Gao ◽  
D. Zhao ◽  
T.W. Zhang ◽  
T. Jin ◽  
S.G. Ma ◽  
...  
Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1569
Author(s):  
Nicolae Filipoiu ◽  
George Alexandru Nemnes

High entropy alloys (HEAs) are still a largely unexplored class of materials with high potential for applications in various fields. Motivated by the huge number of compounds in a given HEA class, we develop machine learning techniques, in particular artificial neural networks, coupled to ab initio calculations, in order to accurately predict some basic HEA properties: equilibrium phase, cohesive energies, density of states at the Fermi level and the stress-strain relation, under conditions of isotropic deformations. Known for its high tensile ductility and fracture toughness, the Co-Cr-Fe-Ni-Al alloy has been considered as a test candidate material, particularly by adjusting the Al content. However, further enhancement of the microstructure, mechanical and thermal properties is possible by modifying also the fractions of the base alloy. Using deep neural networks, we map structural and chemical neighborhood information onto the quantities of interest. This approach offers the possibility for an efficient screening over a huge number of potential candidates, which is essential in the exploration of multi-dimensional compositional spaces.


Author(s):  
E. Khesali ◽  
H. Enayati ◽  
M. Modiri ◽  
M. Mohseni Aref

This paper presents a novel method for detecting ships from high-resolution synthetic aperture radar (SAR) images. This method categorizes ship targets from single-pol SAR images using texture features in artificial neural networks. As such, the method tries to overcome the lack of an operational solution that is able to reliably detect ships with one SAR channel. The method has the following three main stages: 1) feature extraction; 2) feature selection; and 3) ship detection. The first part extracts different texture features from SAR image. These textures include occurrence and co occurrence measures with different window sizes. Then, best features are selected. Finally, the artificial neural network is used to extract ship pixels from sea ones. In post processing stage some morphological filters are used to improve the result. The effectiveness of the proposed method is verified using Sentinel-1 data in VV polarization. Experimental results indicate that the proposed algorithm can be implemented with time-saving, high precision ship extraction, feature analysis, and detection. The results also show that using texture features the algorithm properly discriminates speckle noise from ships.


2019 ◽  
Vol 6 (7) ◽  
pp. 075320 ◽  
Author(s):  
Alejandro E Rodríguez-Sánchez ◽  
Elías Ledesma-Orozco ◽  
Sergio Ledesma ◽  
Agustín Vidal-Lesso

2011 ◽  
Vol 96 (2) ◽  
pp. 220-223 ◽  
Author(s):  
J Anitha ◽  
C Kezi Selva Vijila ◽  
A Immanuel Selvakumar ◽  
A Indumathy ◽  
D Jude Hemanth

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