Abstract
In this study, a medium-entropy alloy (MEA) was used as a new binder to fabricate diamond composite. The MEA base diamond composite (MEA-Comp) shows a much higher transverse rupture strength (TRS, 1453.5 MPa) and a stronger bonding interface than the referenced Co base diamond composite (TRS, 744.9 MPa). It is for the first time found that a (Ni, Co)3Al L12-type phase was in-situ formed between diamond and the MEA matrix. The L12 phase is fully coherent with the diamond in orientation relationship of [001]L12//[001]Diamond and (010)L12//(010)Diamond. Thus, the metallurgical bonding between diamond and metal matrix can be greatly improved, resulting in an enhanced wearing performance. Additionally, chromium carbides (majority Cr7C3 and minor Cr3C2) were also in-situ formed in the interlayer between diamond and matrix. The interlayer composed of L12 phase and chromium carbides can also block the direct contact between diamond and metal matrix, which might slow down the graphitization of diamond under service condition.
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