Figure 4 | Scientific Reports

Figure 4

From: Extra-electron induced covalent strengthening and generalization of intrinsic ductile-to-brittle criterion

Figure 4

The application of ductile-to-brittle criterion to hardness of materials.

(a), Correlation between Experimental Vickers hardness (Hv) and its Pugh's modulus ratio (k = G/B) for hard materials. (b), Experimental Vickers hardness as a function of a product (k2G) between the squared Pugh's modulus ratio (k2) and shear modulus G33,34. Circles correspond to hard materials with cubic structure, whereas solid squares denote non-cubic-lattice hard materials (Supplementary Table S4).

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