Experimental and computer simulation studies of atomic migration during chemical order relaxation in Ll2 intermetallics.

• Autorzy: Kozubski, R. , Oramus, P. , Cadeville, M.C. , Pierron-Bohnes, V. , Pfeiler, W.
• 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

Long-range order (LRO) relaxations, processes controlled by atomic migration in a superstructure , were studied in Ni3Al-based Ll2-ordered intermetallic compounds. The activation energy EA of the relaxation increased with increasing stability of the superstructure and for binary Ni3Al reached 4.6 eV. It is concluded that the value results from the high Al-vacancy formation energy in Ni3Al. The LRO relaxations were composed of two parallel processes showing different rates. The origin of the latter effect was studied by means of Monte Carlo computer simulations, which indicated a predominant role of Al-atom jumps.

Słowa kluczowe

PL

symulacja komputerowa; metoda Monte Carlo; oscylacja atomu; aluminium; nikiel; bor; relaksacja; związek międzymetaliczny; energia porządkująca

EN

computer simulation; Monte Carlo method; atomic vibration; aluminium; nickel; boron; relaxation; intermetallics; ordering energy

• Czasopismo: Inżynieria Materiałowa
• Rocznik: 1998
• Tom: R. XIX, nr 4
• Strony: 884-887
• Opis fizyczny: Bibliogr.9 poz., rys.

Twórcy

autor

Kozubski, R.

• Institute of Physics, Jagellonian University, Kraków, Poland

autor

Oramus, P.

• Institute of Physics, Jagellonian University, Kraków, Poland

autor

Cadeville, M.C.

• Institut de Physique et Chimie des Matériaux de Strasbourg, Strasbourg, France

autor

Pierron-Bohnes, V.

• Institut de Physique et Chimie des Matériaux de Strasbourg, Strasbourg, France

autor

Pfeiler, W.

• Institut für Materialphysik, Universität Wien, Austria

• Jagellonian University, Institute of Physics

Bibliografia

• [1] R.Kozubski, Prog. Mater. Sci. – in press.
• [2] R.Kozubski, J.Soltys, M.C.Cadeville, V.Pierron-Bohnes, T.H.Kim, P.Schwander, J.P.Hahn, G.Kostorz and J.Morgiel, Intermetallics 1 (1993) 139.
• [3] R.Kozubski and W.Pfeiler, Acta Mater. 44 (1996) 1573.
• [4] Y.Minamino, H. Yoshida, S.B.Jung, K.Hirao and T. Yamane, Defect and Diffusion Forum 143-147 (1997) 257.
• [5] R.Kozubski, M.Migschitz and W.Pfeiler, in Stability of Materials, A.Gonis, P.E.A.Turchi and J.Kudrnovsky (eds.), p. 699, NATO ASI Series B, Plenum Press, New York (1996).
• [6] C.L.Fu and G.S.Painter, Acta Mater. 45 (1997) 481.
• [7] H.Schweiger, E.Moroni, W.Püschl, R.Kozubski, R.Podloucky and W.Pfeiler, 2nd Int. Symposium on Structural Intermetallics, Seven Springs, USA, September 1997
• [8] R.Kozubski, Acta Metall. Mater. 41 (1993) 2565.
• [9] P. Oramus, R.Kozubski, M.C.Cadeville, V.Pierron-Bohnes, W.Pfeiler, Mat. Sci.Eng. – in press