In order to develop a new high‐performance binder phase, four different alloys Co‐Ni‐Fe, Co‐Ni‐Cr, Co‐Ni‐Nb, and AlCoCrNiNb_0.5 were used as a binder in cemented carbides. The room‐temperature mechanical properties and high‐temperature flexural strength of cemented carbides were studied. The results show that the optimal mechanical properties for the WC‐8(Co‐Ni‐Fe, Co‐Ni‐Cr, Co‐Ni‐Nb, and AlCoCrNiNb_0.5) can be obtained at the sintering temperatures of 1200°C, 1350°C, 1350°C, and 1300°C, respectively. Compared with cemented carbides with Co as binder phase, the hardness of the four kinds of alloys is increased, the WC grain size becomes finer, but the fracture toughness is slightly decreased. When the temperature is under 600°C, there is no visible oxidation of the four kinds of cemented carbides, and their bending strengths are basically not reduced. When the temperature increased from 600°C to 900°C, the WC‐8(Co‐Ni‐Nb) and WC‐8(Co‐Ni‐Fe) samples present the better high‐temperature bending resistance compared with the WC‐8(Co‐Ni‐Cr) and WC‐8AlCoCrNiNb_0.5 samples, with respective decrease in bending strength of 11.7% and 7.3%.

中文翻译：

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复合粘结剂相对超细晶粒硬​​质合金组织和力学性能的影响

为了开发一种新型的高性能粘结相，四种不同的合金Co-Ni-Fe，Co-Ni-Cr，Co-Ni-Nb和AlCoCrNiNb _0.5被用作硬质合金中的粘结剂。研究了硬质合金的室温力学性能和高温抗弯强度。结果表明，WC‐8（Co‐Ni‐Fe，Co‐Ni‐Cr，Co‐Ni‐Nb和AlCoCrNiNb _0.5的最佳机械性能可以分别在1200°C，1350°C，1350°C和1300°C的烧结温度下获得。与以Co为粘结相的硬质合金相比，四种合金的硬度提高，WC晶粒尺寸变细，但断裂韧性略有降低。当温度低于600℃时，四种硬质合金没有可见的氧化，并且它们的弯曲强度基本上没有降低。当温度从600°C升高到900°C时，与WC-8相比，WC-8（Co-Ni-Nb）和WC-8（Co-Ni-Fe）样品具有更好的耐高温弯曲性（Co-Ni-Cr）和WC-8AlCoCrNiNb _0.5样品，抗弯强度分别降低11.7％和7.3％。