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Polish Academy of Sciences

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A. Tarasek



Recent publications
1.  Pawełek A., Piątkowski A., Wajda W., Skuza W., Tarasek A., Ranachowski Z., Ranachowski P., Ozgowicz W., Kúdela Jr S., Kúdela S., Plastic instabilities induced by the Portevin - Le Châtelier effect and fracture character of deformed Mg-Li alloys investigated using the acoustic emission method, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.1515/amm-2016-0152, Vol.61, No.2, pp.897-904, 2016

Abstract:
The results of the investigation of both mechanical and acoustic emission (AE) behaviors of Mg4Li5Al and Mg4Li4Zn alloys subjected to compression and tensile tests at room temperature are compared with the test results obtained using the same alloys and loading scheme but at elevated temperatures. The main aim of the paper is to investigate, to determine and to explain the relation between plastic flow instabilities and the fracture characteristics. There are discussed the possible influence of the factors related with enhanced internal stresses such as: segregation of precipitates along grain boundaries, interaction of solute atoms with mobile dislocations (Cottrell atmospheres) as well as dislocation pile-ups which may lead to the microcracks formation due to the creation of very high stress concentration at grain boundaries. The results show that the plastic flow discontinuities are related to the Portevin-Le Châtelier phenomenon (PL effect) and they are correlated with the generation of characteristic AE pulse trains. The fractography of broken samples was analyzed on the basis of light (optical), TEM and SEM images.

Keywords:
lightweight alloys, Acoustic Emission, fracture, Portevin-Le Châtelier phenomenon, twinning, dislocations, shear bands

Affiliations:
Pawełek A. - other affiliation
Piątkowski A. - Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
Wajda W. - other affiliation
Skuza W. - other affiliation
Tarasek A. - other affiliation
Ranachowski Z. - IPPT PAN
Ranachowski P. - IPPT PAN
Ozgowicz W. - other affiliation
Kúdela Jr S. - Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
Kúdela S. - Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
2.  Pawełek A., Piątkowski A., Wajda W., Skuza W., Tarasek A., Ozgowicz W., Grzegorczyk B., Ranachowski Z., Kúdela S., Kúdela Jr S., Mechanisms of plastic instability and fracture of compressed and tensile tested Mg-Li alloys investigated using the acoustic emission method, Frattura ed Integrità Strutturale, ISSN: 1971-8993, DOI: 10.3221/IGF-ESIS.35.03, Vol.35, pp.11-20, 2016

Abstract:
The results of the investigation of both mechanical and acoustic emission (AE) behaviors of Mg4Li5Al alloy subjected to compression and tensile tests at room temperature are compared with the test results obtained using the same alloy and loading scheme but at elevated temperatures. The main aim of the paper is to investigate, to determine and to explain the possible influence of factors related with enhanced internal stresses such as: segregation of precipitates along grain boundaries or solute atoms along dislocations (Cottrell atmospheres) or dislocation pile-ups at grain boundaries which create very high stress concentration leading to fracture. The results show that the plastic instabilities are related to the Portevin–Le Châtelier phenomenon (PL effect) and they are correlated with the generation of AE peaks. The fractography of breaking samples was analyzed on the basis of light (optical), TEM and SEM images.

Affiliations:
Pawełek A. - other affiliation
Piątkowski A. - Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
Wajda W. - other affiliation
Skuza W. - other affiliation
Tarasek A. - other affiliation
Ozgowicz W. - other affiliation
Grzegorczyk B. - other affiliation
Ranachowski Z. - IPPT PAN
Kúdela S. - Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
Kúdela Jr S. - Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)

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