6WILLIAMS J C, STARKE E A J. Progress in structural ma- terials for aerospace systems I-J]. Acta Materialia, 2003, 51 (19) :5775-5799.
7THOMAS W M, NORRIS I M, STAINES D G, et al. Fric- tion stir welding-process developments and variant techniques I-R]. [-2011-06-01]. http..//www4, twi. co. uk/private/rg/wt- fsw/pdf.
8CAVALIERE P, CABIBBO M, PANELLA F, et al. 2198 AI-Li plates joined by friction stir welding: mechanical and microstructural behaviorEJ. Materials and Design, 2009, 30 (9) : 3622-3631.