Intermetallic particle

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.^[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

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

WE 43

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

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