Optimization on Stir Casting Process Parameters of Al7050/Nano-B₄C Metal Matrix Composites

Table 4

L9 stir casting process parameters with microhardness.

Ex. no	wt% B4C (A)	Melting temperature (°C) (B)	Stirring speed (rpm) (C)	Stirring time (min) (D)	Microhardness
1	3	700	300	10	162
2	3	750	350	15	171.5
3	3	800	400	20	164
4	6	700	350	20	173
5	6	750	400	10	175.5
6	6	800	300	15	175
7	9	700	400	15	182
8	9	750	300	20	185
9	9	800	350	10	185.5