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Nanohardness, elastic modulus and load-displacement curves of DLC/PEEK and PEEK control. (a) Nanohardness and (b) elastic modulus of DLC/PEEK and PEEK control as a function of indentation depth. Comparison of load-displacement curves of DLC/PEEK and PEEK control at the peak indentation load at (c) 1300 mN and (d) 3000 mN. (Black arrows: ring-like through-thickness cracking) (Reproduced from [22], with permission from © 2010 Elsevier).
