Plastic Instabilities Induced by the Portevin - Le Châtelier Effect and Fracture Character of Deformed Mg-Li Alloys Investigated Using the Acoustic Emission Method

• Autorzy: Pawełek A. , Piątkowski A. , Wajda W. , Skuza W. , Tarasek A. , Ranachowski Z. , Ranachowski P. , Ozgowicz W. , Kúdela Jr. , Kúdela S.

Identyfikatory

DOI

10.1515/amm-2016-0152

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

lightweight alloys; acoustic emission; fracture; Portevin-Le Châtelier phenomenon; twinning; dislocations; shear bands

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2016
• Tom: Vol. 61, iss. 2A
• Strony: 897--904
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Pawełek A.

• Institute of Metallurgy and Materials, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Kraków, Poland

autor

Piątkowski A.

• Institute of Metallurgy and Materials, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Kraków, Poland

autor

Wajda W.

• Institute of Metallurgy and Materials, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Kraków, Poland

autor

Skuza W.

• Institute of Metallurgy and Materials, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Kraków, Poland

autor

Tarasek A.

• Institute of Metallurgy and Materials, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Kraków, Poland

autor

Ranachowski Z.

• Institute of Fundamental Technological Research, Polish Academy of Sciences, 5b Pawinskiego Str., 02-106 Warszawa, Poland

autor

Ranachowski P.

• Institute of Fundamental Technological Research, Polish Academy of Sciences, 5b Pawinskiego Str., 02-106 Warszawa, Poland

autor

Ozgowicz W.

• Institute of Engineering Materials and Biomaterials, Silesian University of Technology, 2a Akademicka Str., 44-100 Gliwice, Poland

autor

Kúdela Jr.

• Institute of Materials and Machine Mechanics, 75 Raĉianska Str., 830-08 Bratislava, Slovak Republic

autor

Kúdela S.

• Institute of Materials and Machine Mechanics, 75 Raĉianska Str., 830-08 Bratislava, Slovak Republic

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