Abstract
Metallic Diamond alloys consist of new materials composed of 5 to 9 different metallic elements. Hardness values from 1380 to 2500 HV (kgf/mm2) were registered, to prove that such alloys are the hardest metallic materials ever developed, in the experimental or industrial sectors. Furthermore, these materials show acceptable fracture toughness (KIC = 8 to 20 MPa.m1/2), as a reflection of t…