Coefficient of crystal lattice matching as a parameter of substrate - crystal structure compatibility in silumins

• Autorzy: Piątkowski J.
• Języki publikacji: EN

Abstrakty

EN

Adding high-melting point elements (Mo, Nb, Ni, Ti, W) to complex silumins results in hardening of the latter ones, owing to the formation of new intermetallic phases of the AlxMey type, with refinement of dendrites in \alfa solution and crystals in \beta phase. The hardening is also due to the effect of various inoculants. An addition of the inoculant is expected to form substrates, the crystal lattice of which, or some (privileged) lattice planes and interatomic spaces should bear a strong resemblance to the crystal nucleus. To verify this statement, using binary phase equilibria systems, the coefficient of crystal lattice matching, being one of the measures of the crystallographic similarity, was calculated. A compatibility of this parameter (up to 20%) may decide about the structure compatibility between the substrate and crystal which, in turn, is responsible for the effectiveness of alloy modification. Investigations have proved that, given the temperature range of their formation, the density, the lattice type, and the lattice parameter, some intermetallic phases of the AlxMey type can act as substrates for the crystallisation of aluminium and silicon, and some of the silumin hardening phases.

Słowa kluczowe

EN

theoretical fundamentals; crystallization process; lattice parameter; nucleation; silumin

PL

proces krystalizacji; parametr sieci krystalicznej; silumin

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2009
• Tom: Vol. 9, iss. 4
• Strony: 191--194
• Opis fizyczny: Bibliogr. 7 poz., rys., tab., wykr.

Twórcy

autor

Piątkowski J.

• Chair of Metal Alloys and Composites Engineering, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, Poland,

Bibliografia

• [1] Z. Poniewierski, Crystallisation, structure and properties of silumins, Warszawa WNT 1989 (in Polish).
• [2] S. Pietrowski, Silumins. Pol. Łódzka, Łódź 2001 (in Polish).
• [3] A. Gierek, T. Mikuszewski, Primary structure formation in metals and alloys. Pol Śl., Gliwice 1998 (in Polish).
• [4] J. Sobczak, Innovations in metalcasting. IO Kraków 2007(in Polish).
• [5] E. Fraś, Crystallisation of metals. WNT 2003 (in Polish).
• [6] H. P. Baker, Alloy Phase Diagrams. ASM International 1992.
• [7] www.lighting.springer.pl