Table 1.

Chemical composition* of commercial billet used in the study.

Alloy	Chemical composition (wt%)
6063	Si	Fe	Cu	Mn	Mg	Zn	Ti	Al
	0.45	0.19	0.02	0.04	0.45	0.03	0.02	Balanced

* Trace levels of Ag, Zr, Sb, Co, V, Be, B, Ca, etc. were detected but are not reported.