Statistical Model for the Mechanical Properties of Al-Cu-Mg-Ag Alloys at High Temperatures

Table 4

Factors and their levels in the experiment fractional factorial design for the high-temperature study.

Factors	Index	Levels
		Low (−1)	High (+1)
Aging time		Underaged (U)	Peak-aged (P)
Testing temperature (°C)		190	250
Cu (wt.%)		3.0	5.0
Mg (wt.%)		0.5	1.0
Ag (wt.%)		0.3	0.6