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1
Content available The Influence of γ' Precipitates on the Structural Stability of FeNi-CoAlTa and FeNiCoAlTaB Single Crystals After Cyclic Superelastic Deformation
Wójcik Anna, Chulist Robert, Szewczyk Arkadiusz, Dutkiewicz Jan, Maziarz Wojciech
Archives of Metallurgy and Materials
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2023
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Vol. 68, iss. 3
1157--1164
EN
Two single crystals with compositions Fe-Ni-Co-Al-Ta and Fe-Ni-Co-Al-Ta-B were selected and fabricated by Bridgman method. Subsequently, ingots were homogenized, oriented and subjected to a two-step heat treatment process in order to obtain fine and coherent γ' precipitates. Subsequently, superelastic cycling experiments were performed at 77 K. The next step included detailed microstructural characterization using transmission electron microscopy and high-energy synchrotron X-ray diffraction measurements together with Rietveld refinement. The results show that the number of fully reversible superelastic strains is very sensitive to the size of γ' precipitates. The smaller (3 nm) γ' precipitates ensured more superelastic response compared to material with larger γ' particles size (5 nm), in which the material did not receive its original shape after 10 cycles even after being heated.
2
Content available Precise Orientation Control of Single Crystalline NiMnGa-Based Alloys by in-situ EBSD Analysis
Szewczyk Arkadiusz, Faryna Marek, Wójcik Anna, Maziarz Wojciech, Chulist Robert
Archives of Metallurgy and Materials
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2023
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Vol. 68, iss. 3
1171--1175
EN
The article presents a precise method for the orientation process of NiMnGa-based single crystals. For this method, a scanning electron microscope equipped with an EBSD camera and a heating stage allowing temperatures exceeding 873 K was used. The orientation process was carried out in both the high-temperature austenite phase and in the room-temperature martensite phase. The facilities allowed for determining the orientation of a single grain of austenite at elevated temperatures as well as the orientation of particular martensitic variants at room temperature. A practically perfect cubic orientation was obtained in the austenitic case with a deviation of about 1° while the samples oriented in the martensitic phase deviated from the desired orientation by 4.5-5.2°. Additionally, the training process of single crystals was carried out in order to show the influence of the orientation process on twinning stress.
3
Content available remote Ocena jakości superkondensatorów wybranymi metodami, wykorzystując zjawiska losowe i badania rozkładu temperatury
Galla Stanisław, Szewczyk Arkadiusz, Smulko Janusz
Przegląd Elektrotechniczny
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2020
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R. 96, nr 9
74--79
PL
W artykule przedstawiono metody analizy jakości wykonania próbek superkondensatorów na podstawie pomiarów szumów generowanych w ich strukturach oraz rozkładów temperatury na ich powierzchni. Prezentowane metody zostały porównane z obecnie stosowanymi parametrami oceny jakości tych elementów. Wyniki uzasadniają wprowadzenie dodatkowych parametrów, pozwalających oceniać jakość superkondensatorów.
EN
We present methods for analyzing the quality of supercapacitor samples based on noise measurements, generated in their structures, and temperature distributions at their surface. The methods have been compared with the currently used quality assessment parameters. The results justify the introduction of additional parameters to assess the quality of supercapacitors.
4
Content available Electrochemical capacitor temperature fluctuations during charging/discharging processes
Galla Stanisław, Szewczyk Arkadiusz, Lentka Łukasz
Metrology and Measurement Systems
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2019
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Vol. 26, nr 1
23--35
EN
The paper presents a proposal of using additional statistical parameters such as: standard deviation, variance, maximum and minimum increases of the observed value that were determined during measurements of temperature fields created on the surface of the tested electrochemical capacitor. The measurements were carried out using thermographic methods in order to support assessment of the condition of electrochemical capacitor under classic durability tests based on methods of determination of capacity and equivalent series resistance. The possibility of using some statistical parameters in assessment of the electrochemical capacitor quality was illustrated. The applied measurement methodology and the results of research associated with the classic methods of supercapacitors’ assessment are presented. The obtained results indicate that the variability of some statistical parameters of temperature fields can be directly related to changing the values of standard parameters describing electrochemical capacitor, which are capacitance and equivalent series resistance.
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