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Wear morphologies of SPFC-AA joints: (a) AA5052 with 6 mm rivet; (b) SPFC with 6 mm rivet; (c) AA5052 with 7 mm rivet; (d) SPFC with 7 mm rivet; (e) AA5052 with 8 mm rivet; (f) SPFC with 8 mm rivet; (g) AA5052 with 9 mm rivet; (h) SPFC with 9 mm rivet.
