For developing new binder phase with high performance, Co-Ni-Fe alloy was used as binder in cemented carbides. The mechanical properties of WC-CoNiFe and WC-Co cemented carbides with different grain sizes were studied. The results show that the reprecipitation of WC-CoNiFe is inhibited compared with that of WC-Co during sintering process, and the grains in WC-CoNiFe cemented carbides are more of smooth shape, resulting in a slightly lower hardness and higher transverse rupture strength. With the increase of the grain size, the hardness of the two cemented carbides decreases, and the transverse rupture strength increases. However, the slope values of K in Hall-Petch relationship are higher in WC-CoNiFe than those in WC-Co, indicating the high toughness of medium entropy alloy Co-Ni-Fe.

为了开发高性能的新型粘结剂相，Co-Ni-Fe合金被用作硬质合金中的粘结剂。研究了不同晶粒尺寸的WC-CoNiFe和WC-Co硬质合金的力学性能。结果表明，与WC-Co相比，在烧结过程中WC-CoNiFe的再沉淀得到抑制，并且WC-CoNiFe硬质合金中的晶粒更光滑，从而硬度略低，横向断裂强度更高。随着晶粒尺寸的增加，两种硬质合金的硬度降低，横向断裂强度提高。但是，WC-CoNiFe中的霍尔-Petch关系中的K的斜率比WC-Co中的K的斜率高，表明中熵合金Co-Ni-Fe具有高韧性。