Intermetallic particles form during solidification of metallic 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.[1] The size of these phases depends on the secondary dendrite arm spacing,[2] as well as the Si content of the alloy,[3][4][5][6] of the primary phase in the micro structure.
Phase | Structure | Space Group | a | b | c | α | β | γ | .. |
---|---|---|---|---|---|---|---|---|---|
α-Al8Fe2Si[7] | hexagonal | p63/mmc(194) | 12.404 | 12.404 | 26.234 | 90 | 90 | 120 | .. |
β-Al5FeSi[8] | monoclinic | 2/m | 6.16760 | 6.1661 | 20.8093 | .. | .. | 91 | .. |
Al2Cu | .. | .. | .. | .. | .. | .. | .. | .. | .. |
In-situ synchrotron diffraction experiment[9] on Electron alloy-WE 43 (Mg4Y3Nd) shows that this alloy form the following intermetallic phases ;Mg12Nd, Mg14Y4Nd, and Mg24Y5.
Phase | Structure | Space Group | a | b | c | α | β | γ | .. |
---|---|---|---|---|---|---|---|---|---|
Mg41Nd5 | .. | .. | .. | .. | .. | .. | .. | .. | .. |
β-Mg14Nd2Y[10] | face centered cubic | 2.2 nm | .. | .. | .. | ||||
Mg24Y5[10] | body centered cubic | .. | 1.12 nm | .. | .. | .. | .. | .. | .. |
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