Optimization and Mechanical Characteristics of AA6061/Zirconia Nanocomposites Fabricated by Ultrasonic-Aided Stir Casting Method

Table 5

GRC and grey relational grade values.

Exp. no.	GRC				Grey relational grade	Rank
	Hardness (VHN)	Elongation (%)	Grain size (μm)	Ultimate tensile strength (MPa)
1	0.382	0.511	0.902	0.343	0.5337	12
2	0.409	0.453	0.797	0.408	0.5163	14
3	0.403	0.388	0.749	0.486	0.5058	15
4	0.334	0.334	1.000	0.334	0.5000	16
5	0.474	0.416	0.808	0.438	0.5337	13
6	0.564	0.535	0.665	0.618	0.5945	9
7	0.516	0.564	0.688	0.606	0.5933	10
8	0.415	0.733	0.762	0.512	0.6064	8
9	0.668	0.614	0.602	0.733	0.6539	4
10	0.461	0.775	0.668	0.609	0.6272	6
11	0.734	0.543	0.605	0.601	0.6197	7
12	0.585	0.568	0.616	0.751	0.6295	5
13	0.748	0.635	0.481	0.856	0.6792	3
14	0.631	0.583	0.558	0.533	0.5761	11
15	0.642	1.000	0.407	0.819	0.7172	2
16	1.000	0.926	0.334	1.000	0.8148	1