Intermetallic particle

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Intermetallic particles form during solidification of metallic alloys.

Aluminium alloys

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Al-Si-Cu-Mg alloys

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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.

Phases and crystal structures

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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 .. .. .. .. .. .. .. .. ..

Magnesium alloys

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WE 43

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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.

Phases and crystal structures

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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 .. .. .. .. .. ..

AZ 91

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References

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  6. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ R.N. Corby and P.J. Black: Acta Crystallogr. Sect. B, 1977, vol. 33, pp. 3468–75.
  8. ^ V. Hansen, B. Hauback, M. Sundberg, C. Romming, and J. Gjonnes: Acta Crystallogr. Sect. B, 1998, vol. 54, pp. 351–57.
  9. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  10. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).


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