Microstructure of Al-Mg-Si-Cu alloys modified with scandium and zirconium.

• Autorzy: Lityńska L.
• Konferencja: 5th Polish-Japanese Symposium on Advanced Methods of Materials Characterization, Niedzica, 28.08-2.09.2004
• Języki publikacji: EN

Abstrakty

EN

The influence of Sc and Zr additions on the structure of cast and heat treated Al-1.0Mg-0.6Si-1.0Cu (in wt. %) alloys was investigated. The best grain refining effect was observed in the alloy containing 0.4% Sc and 0.2% Zr in as cast condition while the alloy with 0.4% Sc and without Sc addition consisted of large grains with dendritic sub-structure. Annealing of alloys in the temperature range from 300 to 540oC leads to a slight hardness increase if Sc or SC + Zr are present. This hardness increase results from the precipitation of fcc L12-type Al3(Sc,Zr) spherical particles uniformly distributed in the matrix. In the Sc-containing alloy, Al3Sc precipitates of about 50-80 nm in size are semicoherent and surrounded by misfit dislocations in the matrix. The addition of Zr reduces the Al3(Sc,Zr) precipitate sizes o about 20-40 nm and complete coherence with the matrix is maintained. After additional ageing at 165 degees centigrade, needle-like precipitates of the metastable Q' phase was found. They cause a further increase in hardness of the alloys.

Słowa kluczowe

EN

microstructure; alloy; scandium; zirconium

PL

mikrostruktura; stop; skand; cyrkon

• Wydawca: Komitet Nauki o Materiałach PAN
• Czasopismo: Archives of Materials Science
• Rocznik: 2005
• Tom: Vol. 26, nr 1-2
• Strony: 65--71
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Lityńska L.

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

Bibliografia

• [1] LS. Toropova, D.G. Eskin, M.L. Kharakterova, T.V. Dobatkina, Advanced Aluminum Alloys Containing Scandium (Gordon and Breach Science Publishers 1998).
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• [3] E.A. Marquis, D.N. Seidman, Acta Mater., 49, 1909 (2001)
• [4] V.G. Davуdov, T.D. Rostova, V.V. Zakharov, Yu.A. Filatov, V.I. Ya1agin Mater. Sci. Eng. A, 280, 30 (2000).
• [5] M.L. Kharakterova, D.G. Eskin, L.L. Rokhlin, Metally, 1, 123 (1997).
• [6] L. Lityńska, J. Dutkiewicz, Proc. of International Conf. "Aluminium in Transport" 22-25 October 2003, Tomaszowice-Krakow, 175.
• [7] G. Lorimer, G. Cliff, P. Champness, C. Dickinson, F. Hasan, P. Kenway, Analytical Electron Microscopy, ed. D. Williams, D. Joy, San Francisco Press (1984) 153.