Partner: Barbara Romelczyk-Baishya

Warsaw University of Technology (PL)

Recent publications
1.Bazarnik P., Nosewicz S., Romelczyk-Baishya B., Chmielewski M., Strojny-Nędza A., Maj J., Huang Y., Lewandowska M., Langdon T.G., Effect of spark plasma sintering and high-pressure torsion on the microstructural and mechanical properties of a Cu–SiC composite, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2019.138350, Vol.766, pp.138350-1-11, 2019
Abstract:

This investigation examines the problem of homogenization in metal matrix composites (MMCs) and the methods of increasing their strength using severe plastic deformation (SPD). In this research MMCs of pure copper and silicon carbide were synthesized by spark plasma sintering (SPS) and then further processed via high-pressure torsion (HPT). The microstructures in the sintered and in the deformed materials were investigated using Scanning Electron Microscopy (SEM) and Scanning Transmission Electron Microscopy (STEM). The mechanical properties were evaluated in microhardness tests and in tensile testing. The thermal conductivity of the composites was measured with the use of a laser pulse technique. Microstructural analysis revealed that HPT processing leads to an improved densification of the SPS-produced composites with significant grain refinement in the copper matrix and with fragmentation of the SiC particles and their homogeneous distribution in the copper matrix. The HPT processing of Cu and the Cu–SiC samples enhanced their mechanical properties at the expense of limiting their plasticity. Processing by HPT also had a major influence on the thermal conductivity of materials. It is demonstrated that the deformed samples exhibit higher thermal conductivity than the initial coarse-grained samples.

Keywords:

Copper, Silicon carbide, High-pressure torsion, Spark plasma sintering, Thermal conductivity

Affiliations:
Bazarnik P.-Warsaw University of Technology (PL)
Nosewicz S.-IPPT PAN
Romelczyk-Baishya B.-Warsaw University of Technology (PL)
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Strojny-Nędza A.-Institute of Electronic Materials Technology (PL)
Maj J.-IPPT PAN
Huang Y.-Bournemouth University (UK)
Lewandowska M.-other affiliation
Langdon T.G.-University of Southampton (GB)
2.Nosewicz S., Romelczyk-Baishya B., Lumelskyj D., Chmielewski M., Bazarnik P., Jarząbek D., Pietrzak K., Kaszyca K., Pakieła Z., Experimental and numerical studies of micro- and macromechanical properties of modified copper–silicon carbide composites, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, ISSN: 0020-7683, DOI: 10.1016/j.ijsolstr.2018.10.025, Vol.160, pp.187-200, 2019
Abstract:

The presented research investigation comprises the study of the mechanical properties of modified copper–silicon carbide composites at the micro- and macroscopic scale. The improvement of a copper–silicon carbide composite refers to the addition of a protective layer at the ceramic reinforcement in order to prevent the dissolution of silicon in the copper matrix. The macromechanical behaviour has been evaluated by the performance in a small punch test. The investigation has been carried out with samples with varying volume content of ceramic reinforcement and different protective layers of the silicon carbide particles. Moreover, the influence of temperature during the strength test has been studied. Next, the results have been referred to the interfacial bonding strength of Cu and SiC particles. SEM characterization of samples has been performed to link the composites’ microstructure with the mechanical behaviour. Finally, the experimental results of the small punch test have been predicted via a numerical approach. Finite element analysis has been employed to reproduce the response of the composite specimen during the test. Satisfactory agreement with the experimental curve has been obtained.

Keywords:

metal matrix composites; silicon carbide; metallic layers deposition; small punch; interface strength; finite element method

Affiliations:
Nosewicz S.-IPPT PAN
Romelczyk-Baishya B.-Warsaw University of Technology (PL)
Lumelskyj D.-IPPT PAN
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Bazarnik P.-Warsaw University of Technology (PL)
Jarząbek D.-IPPT PAN
Pietrzak K.-other affiliation
Kaszyca K.-other affiliation
Pakieła Z.-Warsaw University of Technology (PL)
3.Rojek J., Lumelskyj D., Nosewicz S., Romelczyk-Baishya B., Numerical and experimental investigation of an elastoplastic contact model for spherical discrete elements, Computational Particle Mechanics, ISSN: 2196-4378, DOI: 10.1007/s40571-018-00219-8, Vol.6, No.3, pp.383-392, 2019
Abstract:

A contact model for the normal interaction between elastoplastic spherical discrete elements has been investigated in the present paper. The Walton–Braun model with linear loading and unloading has been revisited. The main objectives of the research have been to validate the applicability of the linear loading and unloading models and estimate the loading and unloading stiffness parameters. The investigation has combined experimental tests and finite element simulations. Both experimental and numerical results have proved that the interaction between the spheres subjected to a contact pressure inducing a plastic deformation can be approximated by a linear relationship in quite a large range of elastoplastic deformation. Similarly, the linear model has been shown to be suitable for the unloading. It has been demonstrated that the Storåkers model provides a good evaluation of the loading stiffness for the elastoplastic contact and the unloading stiffness can be assumed as varying linearly with the deformation of the contacting spheres. The unloading stiffness can be expressed in a convenient way as a function of the Young’s modulus and certain scaling factor dependent on the dimensionless parameter defining the level of the sphere deformation.

Keywords:

Contact; Discrete element method; Elastoplastic; Spheres; Unloading

Affiliations:
Rojek J.-IPPT PAN
Lumelskyj D.-IPPT PAN
Nosewicz S.-IPPT PAN
Romelczyk-Baishya B.-Warsaw University of Technology (PL)
4.Romelczyk-Baishya B., Lumelskyj D., Stępniewska M., Giżyński M., Pakieła Z., The mechanical properties at room and low temperature of p110 steel characterised by means of small punch test, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.24425/amm.2019.126232, Vol.64, No.1, pp.159-165, 2019
Abstract:

In this paper, small punch test (SPT) which is one of miniaturized samples technique, was employed to characterize the mechanical properties of carbon steel P110. The tests were carried out in the range of –175°C to RT. Results obtained for SPT were compared to those calculated for tensile and Charpy impact test. Based on tensile and SPT parameters numerical model was prepared. 8 mm in diameter and 0.8 mm in height (t) discs with and without notch were employed in this research. The specimens had different depth notch (a) in the range of 0.1 to 0.4 mm. It was estimated that α factor for comparison of Tsp and DBTT for carbon steel P110 is 0.55 and the linear relation is DBTT = 0.55TSPT. The numerical model fit with force – deflection curve of SPT. If the factor of notch depth and samples thickness is higher than 0.3 the fracture mode is transformed from ductile to brittle at –150°C.

Keywords:

small punch test, carbon steel P110, small samples, low temperature, mechanical properties

Affiliations:
Romelczyk-Baishya B.-Warsaw University of Technology (PL)
Lumelskyj D.-IPPT PAN
Stępniewska M.-Warsaw University of Technology (PL)
Giżyński M.-Warsaw University of Technology (PL)
Pakieła Z.-Warsaw University of Technology (PL)
5.Chmielewski M., Nosewicz S., Kurpaska Ł., Romelczyk B., Evolution of material properties during the sintering process of Cr-Re-Al2O3 composites, COMPOSITES PART B-ENGINEERING, ISSN: 1359-8368, DOI: 10.1016/j.compositesb.2016.04.065, Vol.98, pp.88-96, 2016
Abstract:

This paper constitutes an analysis of the effect of heat treatment time on the properties of Cr-Re-Al2O3 composite materials. It was found that as a result of sintering, rhenium is dissolved in chromium to create chromium-rhenium solid solution. This process is time-dependent, therefore as the time extends, the structure of material becomes homogenous, which improves its mechanical properties. Within the frame of herein presented studies, a series of technological tests have been carried out for a constant sintering temperature (1450°C) and pressure (30 MPa), with the use of a variable holding time in the maximum temperature. As a result, changes in the structure of Crsingle bondRe matrix have been determined and the resulting changes in the properties of composite. Based on those tests, optimal conditions of the sintering process have been determined from the point of view of obtaining a homogenous structure and the most beneficial properties of Cr-Re-Al2O3 composites.

Keywords:

Metal-matrix composites (MMCs), Mechanical properties, Mechanical testing, Sintering

Affiliations:
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Nosewicz S.-IPPT PAN
Kurpaska Ł.-National Centre for Nuclear Research (PL)
Romelczyk B.-Warsaw University of Technology (PL)
6.Chmielewski M., Nosewicz S., Rojek J., Pietrzak K., Mackiewicz S., Romelczyk B., A study of densification and microstructure evolution during hot pressing of NiAl/Al2O3 composite, Advanced Composite Materials, ISSN: 0924-3046, DOI: 10.1080/09243046.2013.879408, Vol.24, No.1, pp.57-66, 2015
Abstract:

Evolution of the density and the microstructure during hot pressing of NiAl/Al2O3 composite has been investigated in the present paper. In particular, the effect of the process parameters, viz. compacting pressure, sintering temperature and sintering time, on the evolution of the density of the intermetallic–ceramic composite has been studied. Evolution of the density has been related to microstructure changing. Porosity, pore structures and grains rearrangement have been analysed in microscopic observations.

Keywords:

hot pressing, sintering, intermetallic–ceramic composite, density evolution, microstructure

Affiliations:
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Nosewicz S.-IPPT PAN
Rojek J.-IPPT PAN
Pietrzak K.-other affiliation
Mackiewicz S.-IPPT PAN
Romelczyk B.-Warsaw University of Technology (PL)
7.Nosewicz S., Rojek J., Mackiewicz S., Chmielewski M., Pietrzak K., Romelczyk B., The influence of hot pressing conditions on mechanical properties of nickel aluminide/alumina composite, Journal of Composite Materials, ISSN: 0021-9983, DOI: 10.1177/0021998313511652, Vol.48, No.29, pp.3577-3589, 2014
Abstract:

The influence of hot pressing conditions on mechanical properties of nickel aluminide/alumina composite has been investigated in the present paper. In particular, effect of the process parameters, viz. compacting pressure, sintering temperature and sintering time on the evolution of density, elastic constants and tensile strength properties of the intermetallic-ceramic composite has been studied. Elastic constants, the Young's modulus and Poisson's ratio, have been evaluated using an ultrasonic testing method, and the tensile strength has been determined by a Brazilian-type splitting test. Microscopic observations of microstructure evolution complemented the experimental procedure. Experimental results have been confronted with theoretical models showing a good agreement between the data compared.

Keywords:

Hot pressing, sintering, intermetallic-ceramic composite, elastic properties, Brazilian test, tensile strength, ultrasonic method

Affiliations:
Nosewicz S.-IPPT PAN
Rojek J.-IPPT PAN
Mackiewicz S.-IPPT PAN
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Pietrzak K.-other affiliation
Romelczyk B.-Warsaw University of Technology (PL)

Conference abstracts
1.Rojek J., Lumelskyj D., Nosewicz S., Romelczyk B., An elastoplastic contact model for spherical discrete elements, ICCCM 2017, International Conference on Computational Contact Mechanics, 2017-07-05/07-07, Lecce (IT), pp.1, 2017
2.Rojek J., Nosewicz S., Lumelskyj D., Romelczyk B., Bochenek K., Chmielewski M., Simulation of low-pressure powder compaction using an elastoplastic discrete element model, PARTICLES 2017, V International Conference on Particle-Based Methods. Fundamentals and Applications., 2017-09-26/09-28, Hannover (DE), pp.1, 2017