Figure 1

CoF in relation to friction contact time for (a) Al-Al friction pair and (b) Al-Cu friction pair under 5 N, 15 N, 30 N, 40 N, 50 N, and 60 N.

CoF in relation to friction contact time for (a) Al-Al friction pair and (b) Al-Cu friction pair under 5 N, 15 N, 30 N, 40 N, 50 N, and 60 N.