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J. Kuśnierz



Recent publications
1.  Pawełek A., Kuśnierz J., Jasieński Z., Ranachowski Z., Bogucka J., Acoustic emission and the Portevin - Le Chatelier effect in tensile tested Al. alloys before and after processing by accumulative roll-bonding (ARB) technique, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, Vol.54, No.1, pp.83-88, 2009
2.  Pawełek A., Piątkowski A., Kuśnierz J., Bogucka J., Jasieński Z., Ranachowski Z., Ranachowski P., Mizera J., Kúdela S., Kúdela Jr S., Acoustic emission in compressed Mg - Li and Al. alloys processed by ECAP, HPT and ARB methods, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.32, No.4, pp.88-94, 2007
3.  Pawełek A., Kuśnierz J., Bogucka J., Jasieński Z., Ranachowski Z., Ranachowski P., Rejmund F., Dębowski T., Acoustic emission and the Portevin-Le Chatelier effect in tensile tested Al processed by ARB technique, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.32, No.4, pp.955-962, 2007

Abstract:
The paper presents the investigations of the relation between the acoustic emission (AE) and the Porte vin-Le Chatelier (PL) phenomena occurring in tensile tested two kinds of aluminium alloys: not-predeformed and predeformed earlier using the technique of accumulative rolling banding (ARB). There have been found essential correlations between AE and PL effects in ARB not-predeformed alloys. The tensile tests for ARB predeformed alloys were performed on a series of samples of various degree of work hardening and it has been observed that the correlations between the AE and PL effects are not so pronounced as in the case of ARB not-predeformed alloys. The results of AE measurements obtained using a new software allowed additionally to carry out the spectral analysis of AE signals and, in consequence, to determine the acoustic maps (acoustograms) and the spectral characteristics which are very useful in the discussion of the relations between the non-homogeneous strain mechanisms of the PL effect and the mechanisms of AE events generation. The results are discussed in the context of the existing dislocation models of the PL effect and the theoretical concepts of AE sources

Keywords:
acoustic emission (AE), Portevin-Le Chatelier (PL) effect, tensile test, dislocations, strain mechanism, nanocrystalline and/or ultra fine-grained structure, accumulative rollbonding (ARB)

Affiliations:
Pawełek A. - other affiliation
Kuśnierz J. - other affiliation
Bogucka J. - other affiliation
Jasieński Z. - Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
Ranachowski Z. - IPPT PAN
Ranachowski P. - IPPT PAN
Rejmund F. - IPPT PAN
Dębowski T. - IPPT PAN
4.  Pawełek A., Kuśnierz J., Ranachowski Z., Jasieński Z., Anisotropy of acoustic emission and-Portevin-Le Chatelier phenomena in polycrystalline aluminium alloys subjected to tensile tests, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.31, No.4, pp.75-81, 2006

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