Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint

Table 1

Chemical composition of 7075-T651 aluminum alloy (wt.%).

Cr	Cu	Fe	Mg	Mn	Si	Ti	Zn	Other impurities		Al
								Each	Total
0.18–0.28	1.2–2.0	0.5	2.1–2.9	0.3	0.4	0.2	5.1–6.1	0.05	0.15	Rest