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Keywords = tweed structure

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21 pages, 32435 KB  
Article
Structure and Magnetic Properties of Vanadium-Doped Heusler Ni-Mn-In Alloys
by Dmitry Kuznetsov, Elena Kuznetsova, Alexey Mashirov, Alexander Kamantsev, Denis Danilov, Georgy Shandryuk, Sergey Taskaev, Irek Musabirov, Ruslan Gaifullin, Maxim Kolkov, Victor Koledov and Pnina Ari-Gur
Nanomaterials 2025, 15(19), 1466; https://doi.org/10.3390/nano15191466 - 24 Sep 2025
Viewed by 412
Abstract
The crystal structure, texture, martensitic transformation, and magnetic properties of magnetic shape-memory Heusler alloys of Ni51−xMn33.4In15.6Vx (x = 0; 0.1; 0.3; 0.5; 1) were investigated. Experimental studies of the magnetic properties and meta-magnetostructural transition (martensitic transition—MT) [...] Read more.
The crystal structure, texture, martensitic transformation, and magnetic properties of magnetic shape-memory Heusler alloys of Ni51−xMn33.4In15.6Vx (x = 0; 0.1; 0.3; 0.5; 1) were investigated. Experimental studies of the magnetic properties and meta-magnetostructural transition (martensitic transition—MT) confirm the main sensitivity of the martensitic transition temperature to vanadium doping and to an applied magnetic field. This makes this family of shape-memory alloys promising for use in numerous applications, such as magnetocaloric cooling and MEMS technology. Diffuse electron scattering was analyzed, and the structures of the austenite and martensite were determined, including the use of TEM in situ experiments during heating and cooling for an alloy with a 0.3 at.% concentration of V. In the austenitic state, the alloys are characterized by a high-temperature-ordered phase of the L21 type. The images show nanodomain structures in the form of tweed contrast and contrast from antiphase domains and antiphase boundaries. The alloy microstructure in the temperature range from the martensitic finish to 113 K consists of a six-layer modulated martensite, with 10 M and 14 M modulation observed in local zones. The morphology of the double structure of the modulated martensite structure inherits the morphology of the nanodomain structure in the parent phase. This suggests that it is possible to control the structure of the high-temperature austenite phase and the temperature of the martensitic transition by alloying and/or rapidly quenching from the high-temperature phase. In addition, attention is paid to maintaining fine interface structures. High-resolution transmission electron microscopy showed good coherence along the austenite–martensite boundary. Full article
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18 pages, 4446 KB  
Article
Extraction of the Microstructure of Wool Fabrics Based on Structure Tensor
by Jiani Zhu, Youwei Ma, Guoqing Ding, Manhua Liu and Xin Chen
Sensors 2023, 23(15), 6813; https://doi.org/10.3390/s23156813 - 31 Jul 2023
Cited by 2 | Viewed by 1801
Abstract
The trends of “fashionalization”, “personalization” and “customization” of wool fabrics have prompted the textile industry to change the original processing design based on the experience of engineers and trial production. In order to adapt to the promotion of intelligent production, the microstructure of [...] Read more.
The trends of “fashionalization”, “personalization” and “customization” of wool fabrics have prompted the textile industry to change the original processing design based on the experience of engineers and trial production. In order to adapt to the promotion of intelligent production, the microstructure of wool fabrics is introduced into the finishing process. This article presents an automated method to extract the microstructure from the micro-CT data of woven wool fabrics. Firstly, image processing was performed on the 3D micro-CT images of the fabric. The raw grayscale data were converted into eigenvectors of the structure tensor to segment the individual yarns. These data were then used to calculate the three parameters of diameter, spacing and the path of the center points of the yarn for the microstructure. The experimental results showed that the proposed method was quite accurate and robust on woven single-ply tweed fabrics. Full article
(This article belongs to the Section Sensing and Imaging)
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10 pages, 1883 KB  
Article
Cyclic Tension Induced Pattern Formation on [001] Single-Crystal Aluminum Foil
by Kuznetsov Pavel and Khon Yury
Crystals 2022, 12(1), 28; https://doi.org/10.3390/cryst12010028 - 24 Dec 2021
Viewed by 2211
Abstract
Cyclic tension of (100)[001]-oriented single-crystal aluminum foils with the frequency 5 Hz forms a tweed pattern. Its period is several microns and increases by a factor of 1.5 in the temperature range 233–363 K. A model is proposed for structural relaxation of the [...] Read more.
Cyclic tension of (100)[001]-oriented single-crystal aluminum foils with the frequency 5 Hz forms a tweed pattern. Its period is several microns and increases by a factor of 1.5 in the temperature range 233–363 K. A model is proposed for structural relaxation of the medium on spatial and time meso- and macroscales under cyclic loading. Conditions under which a steady pattern forms are found based on the analysis of kinetic equations. The number of bands in the steady pattern is found to be related to the strain rate. The process activation energy is determined. Full article
(This article belongs to the Special Issue Defects in Crystals)
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