Processing and mechanical properties of mechanically alloyed niobum-rich Nb-Al alloys.

• Autorzy: Dymek S. , Dollar M. , Leonard K. , Wróbel M.
• Konferencja: AMT'98 XVth Physical Metallurgy and Materials Science Conference 'Advanced Materials & Technologies', 17-21 May, 1998, Kraków-Krynica, Poland
• Języki publikacji: EN

Abstrakty

EN

Four Nb-Al alloys containing 15%, 18%, 20% and 25% at. Al were successfully processed by mechanical alloying followed by hot pressing. Analysis of X-ray spectra as well as transmission electron microscopy studies revealed the presence of four phases: niobum solid solution (Nbss), NB3Al, Nb2Al and dispersoids of Al2O3. The grain size was estimated to be = 1 micrometre. The improvement in strength of the mechanically alloyed material was due to the refined grain size and oxide dispersion in the microstructure. The alloys exhibited only limited compressive ductility at room temperature but were ductile at 1000 degrees centigrade. The mechanism for creep deformation in the examined Nb-Al alloys is postulated to be dislocation creep through diffusion controlled climb.

Słowa kluczowe

EN

niobum aluminides; niobum; aluminid; alloy; hot pressing; transmission electron microscopy; X-ray diffraction analysis; mechanical properties; hardness; creep; deformation

PL

niob; aluminid; stop; prasowanie na gorąco; mikroskopia elektronowa prześwietleniowa; dyfrakcja promieniowania rentgenowskiego; własności mechaniczne; twardość; pełzanie materiału; odkształcenie

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 1998
• Tom: R. XIX, nr 4
• Strony: 1147--1152
• Opis fizyczny: Bibliogr. 12 poz., tab., rys.

Twórcy

autor

Dymek S.

• Metallurgical and Materials Engineering Department, Academy of Mining and Metallurgy, Kraków, Poland

autor

Dollar M.

• MMAE Department, Illinois Institute of Technology, Chicago, USA

autor

Leonard K.

• MMAE Department, Illinois Institute of Technology, Chicago, USA

autor

Wróbel M.

• Metallurgical and Materials Engineering Department, Academy of Mining and Metallurgy, Kraków, Poland

• Academy of Mining and Metallurgy, Metallurgical and Materials Engineering Department, Kraków

Bibliografia

• [1] D.M. Shah and D.L. Anton, Mat. Sci. Eng., A153 (1992) 402.
• [2] E.M. Schulson and D.R. Barker, Scripta Met., 17 (1983) 519
• [3] M. Dollar, S. Dymek, P. Nash and S.J. Hwang, Metall. Trans., 24A (1993) 1993.
• [4] S.J. Hwang, Ph. D. Thesis, Illinois Institute of Technology, Chicago 1992.
• [5] S.J. Suh, Ph. D. Thesis, Illinois Institute of Technology, Chicago 1994.
• [6] S. Dymek and M. Dollar, Proc. of IX Conf. on Electron Microscopy of Solids, p.389, ed. A. Czyrska-Filemonowicz et al., Kraków-Zakopane 1996.
• [7] S. Dymek, M. Dollar and K. Leonard, accepted to Mat. Sci. Eng., 1998.
• [8] Murayama, T. Kumagai and S. Hanada, Mat. Res. Soc. Symp. Proc. vol. 288, ed. I. Baker, R. Darolia, J.D. Whittenberger and M.H. Yoo, MRS (1993), p. 95
• [9] R. Suyama, M. Kimura and K. Hashimoto, „Structural Intermetallics”, ed. R. Darolia, J.J. Lewandowski, C.T. Liu, P.L. Martin, D.B. Miracle and M.V. Nathal, The Minerals, Metals and Materials Society, 1993, p. 681.
• [10] S. Suh, M. Dollar and P. Nash, Mat. Sci. Eng., 192A (1995) 691.
• [11] D.L. Anton and D.M. Shah, Mat. Res. Symp. Proc., vol. 133, MRS 1989, p.361
• [12] A J.E. Dorn, „Creep and Fracture of Metals at High Temperatures”, National Physical Laboratory, London U.K. (1956).