Search results for: Robert Chulist

Items from 1 to 15 out of 15 results

article

Adaptive Phase or Variant Formation at the Austenite/Twinned Martensite Interface in Modulated Ni–Mn–Ga Martensite

Robert Chulist, Anna Wójcik, Alexei Sozinov, Tomasz Tokarski, more

Advanced Functional Materials > 34 > 22 > n/a - n/a

The crystal structure and transformation path from austenite to 10M martensite in Ni–Mn–Ga single crystal are examined employing high‐energy synchrotron radiation, scanning, and transmission electron microscopy. Using temperature gradient, an austenite/twinned martensite interface is stabilized revealing the crystal structure and microstructure of both phases and the transformation sequence across...

article

Thermoplastic hardened Cu-Ni-Si-Ag alloy

Beata Krupińska, Robert Chulist, Marcin Kondracki, Krzysztof Labisz

Bulletin of the Polish Academy of Sciences. Technical Sciences > 2023 > Vol. 71, nr 2 > art. no. e145683

The paper aims to investigate the influence of silver addition on the microstructure of CuNi2Si1 alloys. The investigated copper alloy was cast and then supersaturated, plastically deformed on the Gleeble 3800 simulator and finally aged. Structural changes were examined using optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Orientation mapping was...

article

Precise Orientation Control of Single Crystalline NiMnGa-Based Alloys by in-situ EBSD Analysis

Arkadiusz Szewczyk, Marek Faryna, Anna Wójcik, Wojciech Maziarz, more

Archives of Metallurgy and Materials > 2023 > Vol. 68, iss. 3 > 1171--1175

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...

article

TEM, HREM, L-TEM Studies of Fe-Based Soft Magnetic Melt-Spun Ribbons Subjected to Ultra-Rapid Annealing Process

Wojciech Maziarz, Aleksandra Kolano-Burian, Maciej Kowalczyk, Piotr Błyskun, more

Archives of Metallurgy and Materials > 2023 > Vol. 68, iss. 3 > 1165--1170

In the present work, we performed the ultra-rapid annealing (URA) process for amorphous Fe₇₈Ni₈B₁₄ melt-spun ribbons in order to obtain fine excellent microstructure assuring the best soft magnetic properties. Several microscopic methods mainly based on transmission electron microscopy (TEM) and Lorentz TEM (L-TEM) were applied for detailed studies of the microstructure and magnetic domains structure...

article

The Influence of γ' Precipitates on the Structural Stability of FeNi-CoAlTa and FeNiCoAlTaB Single Crystals After Cyclic Superelastic Deformation

Anna Wójcik, Robert Chulist, Arkadiusz Szewczyk, Jan Dutkiewicz, more

Archives of Metallurgy and Materials > 2023 > Vol. 68, iss. 3 > 1157--1164

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...

article

Structural Characterization and Properties of Al/Fe Multi-Layer Composites Produced by Hot Pressing

Wojciech Kowalski, Henryk Paul, Izabela Mania, Paweł Petrzak, more

Archives of Metallurgy and Materials > 2023 > Vol. 68, iss. 1 > 137--144

This study aimed to develop Fe/Al multilayered metallic/intermetallic composites produced by hot pressing under an air atmosphere. Analyses were carried out on the composite plates made up of alternatively situated sheets of AA1050 aluminum alloy and DN04 low carbon steel, which were annealed at 903 K for 2, 5, and 10 h. Annealing was performed to obtain reaction layers of distinct thickness. The...

article

Crystal Lattice Rotations Induced by Shear Banding in fcc Metals Deformed at High Strain Rates

Izabela Mania, Henryk Paul, Robert Chulist, Paweł Petrzak, more

Archives of Metallurgy and Materials > 2023 > Vol. 68, iss. 1 > 319--329

In this paper, the microstructural and texture changes in polycrystalline CuZn30 alloy, copper, and AA1050 aluminium alloy have been studied to describe the crystal lattice rotation during shear bands formation. The hat-shaped specimens were deformed using a drop-hammer at the strain rate of 560 s^-1. Microstructure evolution was investigated using optical microscopy, whereas texture changes were examined...

article

Microstructure evolution of pure titanium during hydrostatic extrusion

Daniel Wojtas, Łukasz Maj, Krzysztof Wierzbanowski, Anna Jarzębska, more

Archives of Civil and Mechanical Engineering > 2023 > Vol. 23, no. 1 > art. no. e9, 2023

Regarding severely deformed materials of potentially high applicability in various industry branches, their microstructure evolution during processing is of vast significance as it enables to control or adjust the most essential properties, including mechanical strength or corrosion resistance. Within the present study, the microstructure development of commercially pure titanium (grade 2) in the...

article

Suppression and Recovery of Martensitic Transformation and Magnetism in Mechanically and Thermally Treated Magnetic Shape‐Memory Ni−Mn−Ga Melt‐Spun Ribbons

Paweł Czaja, Robert Chulist, Anna Wójcik, Maciej Kowalczyk, more

Advanced Engineering Materials > 23 > 11 > n/a - n/a

As‐melt‐spun Ni_50.2Mn_28.3Ga_21.5 ribbons are subjected to milling and subsequent annealing for various times. With progressing milling time, the martensitic transformation is gradually suppressed, magnetic moment deteriorates, whereas the crystal structure undergoes a body centered tetragonal (bct) into face centered cubic (fcc) change. High‐resolution transmission electron microscopy demonstrates...

article

Interfacial Reactions in the Bonding Zones of Explosively Welded Tantalum to Stainless Steel Sheets

Henryk Paul, Robert Chulist, Izabela Mania, Norbert Schell, more

Advanced Engineering Materials > 23 > 11 > n/a - n/a

The microstructure of the interfacial layers of explosively welded Ta/stainless steel (SS) and Ta/Cu/SS composites is investigated by X‐ray synchrotron radiation, scanning (SEM), and transmission (TEM) electron microscopies. SEM analyses show that all interfaces between joined sheets undergo wave‐shaped deformation with the solidified melt regions situated preferentially in the wave vortexes and...

article

New Insights into the Intermartensitic Transformation and Over 11% Magnetic Field‐Induced Strain in 14 m Ni−Mn−Ga Martensite

Robert Chulist, Emmanouel Pagounis, Paweł Czaja, Norbert Schell, more

Advanced Engineering Materials > 23 > 11 > n/a - n/a

Stress‐induced intermartensitic phase transformation from 10 m to 14 m modulated martensite structure is characterized in Ni50.5−Mn28.9−Ga20.6 at% single crystals, with particular focus on periodic atomic shuffling by in situ synchrotron radiation diffraction. Under compression, along the [001] direction, at 6 MPa, the self‐accommodated 10 m single crystal is found to transform to a nearly single‐variant...

article

Interfacial Phenomena between Liquid Ga-Based Alloys and Ni Substrate

Tomasz Gancarz, Katarzyna Berent, Norbert Schell, Robert Chulist

Journal of Electronic Materials > 2019 > 48 > 9 > 5941-5947

In this study, wetting tests for Ni substrate with eutectic Ga-Sn-Zn are carried out using the sessile drop method. The experiments are performed for 1, 10 and 30 days of contact, at temperatures of 100°C, 150°C and 250°C. Selected liquid/substrate couples are cross-sectioned and subjected to scanning electron microscopy with energy dispersive spectroscopy for interfacial microstructure investigation...

article

Wetting of Sn-Zn-Ga and Sn-Zn-Na Alloys on Al and Ni Substrate

Tomasz Gancarz, Piotr Bobrowski, Sylwia Pawlak, Norbert Schell, more

Journal of Electronic Materials > 2018 > 47 > 1 > 49-60

Wetting of Al and Ni substrate by Sn-Zn eutectic-based alloys with 0.5 (wt.%) of Ga and 0.2 (wt.%) of Na was studied using the sessile drop method in the presence of ALU33^® flux. Spreading tests were performed for 60 s, 180 s, and 480 s of contact, at temperatures of 503 K, 523 K and 553 K (230°C, 250°C, and 280°C). After cleaning the flux residue from solidified samples, the spreading areas of Sn-Zn0...

article

Microstructural and Phase Composition Differences Across the Interfaces in Al/Ti/Al Explosively Welded Clads

Dagmara Malgorzata Fronczek, Robert Chulist, Lidia Litynska-Dobrzynska, Gabriel Alejandro Lopez, more

Metallurgical and Materials Transactions A > 2017 > 48 > 9 > 4154-4165

The microstructure and phase composition of Al/Ti/Al interfaces with respect to their localization were investigated. An aluminum-flyer plate exhibited finer grains located close to the upper interface than those present within the aluminum-base plate. The same tendency, but with a higher number of twins, was observed for titanium. Good quality bonding with a wavy shape and four intermetallic phases,...

article

Phase transformations in a CuCr alloy induced by high pressure torsion

Anna Korneva, Boris Straumal, Askar Kilmametov, Robert Chulist, more

Materials Characterization > 2016 > 114 > C > 151-156

Phase transformations induced by high pressure torsion (HPT) at room temperature in two samples of the Cu-0.86at.% Cr alloy, pre-annealed at 550°C and 1000°C, were studied in order to obtain two different initial states for the HPT procedure. Observation of microstructure of the samples before HPT revealed that the sample annealed at 550°C contained two types of Cr precipitates in the Cu matrix: large...

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