Diamond and High Entropy Alloy HEA (Co-Cr-Cu-Fe-Ni) Material

Diamond and  High Entropy Alloy HEA (Co-Cr-Cu-Fe-Ni) Material 

Diamond is a unique material, both naturally occurring and synthetically produced, with unparalleled thermal conductivity and hardness. It plays a crucial role in metal matrix composites used for abrasive tools and thermally conductive applications. The adhesion at the diamond/metal interface, driven by chemical bonding, is essential for the performance of such composites.

High-entropy alloys (HEAs) with FCC structures, particularly those within the Co-Cr-Cu-Fe-Mn-Mo-Ni-Ti system, show great potential as matrix materials for diamond-based composites. These HEAs offer an excellent combination of high strength, hardness, ductility, and wear resistance. Additionally, they are easily manufacturable and compatible with powder metallurgy techniques for producing metal matrix diamond composites.

Notably, HEAs within the Co-Cr-Cu-Fe-Ni system are of particular interest. They contain elements that enhance thermal conductivity (Cu) and improve adhesion to diamond (Cr, Ti, Co). Previous studies have shown that these HEAs exhibit a favorable balance of mechanical properties, with an ultimate tensile strength (UTS) of approximately 1000 MPa and a hardness of around 100 HRB. Moreover, they form carbide layers at the interface, ensuring strong adhesion to diamond.

Common HEA Material

FeCoNiCuCr

TiZrNbMoTa

CoCrFeMnNi

AlCoCrFeNi

TiZrHfNbTa

AlCoCrFeMn

AlCoCuFeNi

AlCoCrCuFeNi

AlCoCrCuFeMn

CoCrCuFeNiTi

FeMnCoCrNi