Microstructure Changes and Improvement in the Mechanical Properties of As-Cast AlSi7MgCu0.5 Alloy Induced by the Heat Treatment and ECAP Technique at Room Temperature

Table 2

Average size (d) and number per unit area (n) of the particles present in microstructure of AlSi7MgCu0.5 alloy [9].

Alloy state	Eutectic silicon particles		Particles of intermetallic phases		Particles of precipitates
	d (μm)	n (mm^−2)	d (μm)	n (mm^−2)	d (nm)	n (mm^−2)
As-cast	0.5	21.3 × 10^4	1.9	0.31 × 10^4	—	—
Overaged	3.0	1.0 × 10^4	2.0	0.09 × 10^4	114	3.5 × 10^6
ECAPed	2.5	1.5 × 10^4	1.6	0.18 × 10^4	77	8.1 × 10^6