The influence of the chemical composition and temperature of plastic deformation on the PLC effect in tin bronzes

• Autorzy: Ozgowicz W. , Opeldus B.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of the present paper is the determination of the effect of the chemical composition and temperature of deformation of standardized tin bronzes and bronze modified with zirconium on the Portevin-Le Chatelier (PLC) phenomenon, mainly basing on the shape of stress-strain curves within the temperature range of 100÷300°C and observations of their structure. The reasons of the occurrence of such en effect are so far no fully known and explained and the opinions concerning is physical basis vary. Design/methodology/approach: Of essential design in this research is determination of the dependence of PLC effect on the chemical composition, temperature and strain rate and the preliminary heat treatment and grain size. The main method used in this investigation is tensile test at elevated temperature. Findings: The main conclusions are following: the PLC effect on tin bronzes with a miero-addition of zirconium in an amount of 0.01÷0.05% depends the temperature of deformation in the tensile test in the range of 100÷300°C and the chemical composition of the alloys; the type of serration revealed on the δ–ε curve depend mainly on the temperature of deformation and can be differ during the respective stages of the analyzed curves. Practical implications: In this paper implications for practice are not taken into consideration. Originality/value: In this paper an additive type of serration observed on the curves δ–ε, denoted by the symbol D, is new.

Słowa kluczowe

EN

metallic alloys; plastic instability; Portevin-Le Chatelier effect; tensile test at elevated temperature

PL

stopy metaliczne; niestabilność plastyczna; efekt Portevina-Le Chateliera; próba rozciągania; temperatura podwyższona

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 17, nr 1-2
• Strony: 129--132
• Opis fizyczny: Bibliogr. 12 poz., rys., tab., wykr.

Twórcy

autor

Ozgowicz W.

• Division of Constructional and Special Materials Engineering, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Opeldus B.

• Division of Constructional and Special Materials Engineering, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

Bibliografia

• [1] A. Portevin, F. Le Chatelier: Cr. Acad. Sci., Paris, 176, 507, 1923.
• [2] A. Korbel: Scientific Bulletins of the S.STASZIC University of Mining and Metallurgy, No 474, Metallurgy and Foundry Practice, Bull. 65, ”The analyses of the non-uniform deformation in the substitutional solid solutions”, Cracow, 1974.
• [3] J. Wyrzykowski: „The influence of grain boundary feature on the boundary effect”, Research works, Mechanics, No 105, 1987, p. 4-102.
• [4] P. Hähner: „On the critical conditions of the Portevin-Le Chatelier effect”, Acta Mater. 9 1997, p. 3695-3706.
• [5] A. Poznańska, J. Sieniawski: „The Portevin-Le Chatelier effect in the EI-867 nickel super-alloy”, Materials engineering, No 1, 1995, p. 15 – 19.
• [6] J. Mizera, K. Kurzydłowski: „On the anisotropy of the Portevin-Le Chatelier plastic instabilities in Al-Li-Cu-Zr alloy”, Scripta Material, 45, 2001, 801.
• [7] J. Balik: „The onset Portevin-Le Chatelier instabilities in tensile testing”, Mater. Sci. Eng. A 316, 2001, p 102-108.
• [8] Z. Kovàcs: PhD.Thesis; Portevin–Le Chatelier plastic instabilities, Eötcös Loránd Univ., Budapest 2002.
• [9] F. B. Klose, A. Ziegenbein, (i in.): „Portevin–Le Chatelier effect in strain and stress controlled tensile tests”, Comput. Mater. Sci. 26, 2003, p. 80-86.
• [10] F. B. Klose, A. Ziegenbein (i in.): Mater. Sci Eng A369; „Analysis of Portevin–Le Chatelier serration of type B in Al-Mg”, 2004, p. 76-81.
• [11] Z. Jiang: „Spatial characteristics of the Portevin-Le Chatelier deformation bands in Al-4 at %Cu polycrystals” Mater. Sci. Eng., 2005, p. 154-164.
• [12] J. Kong, (i in.): „Effect of type-B Portevin–Le Chatelier bands in uniaxial tension of strip cast AA5754 sheets” Scripta Mater. 53, 2005, p. 499-503.