Indentation size effects in face centered cubic single crystal thin films

Size effects in miniaturized polycrystalline FCC samples: Strengthening versus weakening

“…doi:10. 1016/j.ijsolstr.2006.05.009 From an experimental perspective, most attention on size effects in miniaturization has been given to strengthening effects in metals, whereby micro-bending experiments (Stö lken and Evans, 1998;Takahiro et al, 2000), nano-indentation experiments (Ma and Clarke, 1994;McElhaney et al, 1998;Nix and Gao, 1998;Elmustafa et al, 2000;Tymiak et al, 2001;Shan and Sitaraman, 2003;Zhao et al, 2003), torsion experiments (Fleck et al, 1994;Fleck and Hutchinson, 1997) or thin film analyses (Haque and Saif, 2003;Greer et al, 2005;Zong and Soboyejo, 2005) were the main set-ups used. In almost all cases, a pronounced strengthening has been found at decreasing specimen scale.…”

Indentation size effects in pack carbo-nitrided AISI 8620 steels

“…The nanoindentation hardness (H), was defined as the ratio of maximum indentation load (P max ) to projected contact area (A c ). This is given by [23] …”

“…The phenomenon is usually attributed to causes such as work hardening, pile-up, sinkin, roughness, surface energy, crystal anisotropy and the shape of the indenter [21,22]. Zong et al [23,24] have also studied ISE in both single and polycrystalline Au, while Cao et al [13] have studied the indentation size effects in polycrystalline Au and Ag thin films. Rodriguez and Gutierrez [25] have investigated the ISE in several heat treated steels.…”

“…Hence, the measured changes in hardness are attributed to effects of strain gradients that give rise to the formation of geometrically necessary dislocations that are the causes of the ISE [22]. The measured ISE was interpreted using the mechanism-based strain gradient plasticity theory of Nix and Gao [22][23][24][25][26][27][28]. The implications of the results are then discussed for the carbo-nitriding of steel surfaces for a range of structural and tribological applications.…”

Computer Aided Multi-scale Design of SiC-Si3N4 Nanoceramic Composites for High-Temperature Structural Applications

“…Materials systems analyzed include metallic thin films, e.g. Cu, Al, Ni, [141][142][143], thin films made of metallic alloys, e.g. Ni 3 Al, [144], and ceramics e.g.…”