Fig. 4: Calculated stress-strain curves of int-diamond, nt-diamond, and ng-diamond.
From: Intersectional nanotwinned diamond-the hardest polycrystalline diamond by design

The red, yellow, blue and cyan line is the stress-strain curve of int-diamond with twin thickness λ1 = 5.5 nm and λ2 = 1.2 nm, nt-diamond with twin thickness λ of 5.5 and 1.2 nm, and ng-diamond, respectively.