Nacre-like surface nanolaminates enhance fatigue resistance of pure titanium.

ABSTRACT: Fatigue failure is invariably the most crucial failure mode for metallic structural components. Most microstructural strategies for enhancing fatigue resistance are effective in suppressing either crack initiation or propagation, but often do not work for both synergistically. Here, we demonstrate that this challenge can be overcome by architecting a gradient structure featuring a surface layer of nacre-like nanolaminates followed by multi-variant twinned structure in pure titanium. The polarized accommodation of highly regulated grain boundaries in the nanolaminated layer to cyclic loading enhances the structural stability against lamellar thickening and microstructure softening, thereby delaying surface roughening and thus crack nucleation. The decohesion of the nanolaminated grains alon

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC11319618 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature