Intermetallic particles form during solidification of metallic alloys.
Aluminium alloys
Al-Si-Cu-Mg alloys
Al-Si-Cu-Mg alloys form Al5FeSi- plate like intermetallic phases like -Al8Fe2Si, Al2Cu, etc. The size and morphology of these intermetallic phases in these alloys control the mechanical properties of these alloys, especially strength and ductility. The size of these phases depends on the secondary dendrite arm spacing, as well as the Si content of the alloy, of the primary phase in the micro structure.
Phases and crystal structures
Phase Structure Space Group a b c α β γ .. α-Al8Fe2SiR.N. Corby and P.J. Black: Acta Crystallogr. Sect. B, 1977, vol. 33, pp. 3468–75. hexagonal p63/mmc(194) 12.404 12.404 26.234 90 90 120 .. β-Al5FeSiV. Hansen, B. Hauback, M. Sundberg, C. Romming, and J. Gjonnes: Acta Crystallogr. Sect. B, 1998, vol. 54, pp. 351–57. monoclinic 2/m 6.16760 6.1661 20.8093 .. .. 91 .. Al2Cu .. .. .. .. .. .. .. .. ..
Magnesium alloys
WE 43 In-situ synchrotron diffraction experiment on Electron alloy-WE 43 (Mg4Y3Nd) shows that this alloy form the following intermetallic phases; Mg12Nd, Mg14Y4Nd, and Mg24Y5.
Phases and crystal structures
Phase Structure Space Group a b c α β γ .. Mg41Nd5 .. .. .. .. .. .. .. .. .. β-Mg14Nd2Y face centered cubic 2.2 nm .. .. .. Mg24Y5 body centered cubic .. 1.12 nm .. .. .. .. .. ..
AZ 91
References