Development of cemented carbides with Co FeNiCrCu high-entropy alloyed binder prepared by spark plasma sintering

Chen, Ruizhi; Zheng, Su; Zhou, Rui; Wei, Bangzheng; Yang, Guang; Chen, Pengqi; Cheng, Jigui

doi:10.1016/j.ijrmhm.2021.105751

Cited by 19 publications

(5 citation statements)

References 40 publications

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“…A maximal WC grain size of 760 nm was obtained for the sample with WC milled for 2 h and 30 mol.% of HEA. Thus, the obtained WC grain size with an fcc binder was higher than in the composites with bcc [51] and bcc + fcc binders [54]. It should be also noted that the HEAs mentioned above [51,54] contained chromium, which is known to be a strong grain growth inhibitor, so the refinement of WC grains is expected.…”

Section: Refinement Of Wc Grains By Use Of Hea Bindersmentioning

confidence: 87%

“…Another example of WC grain refinement with HEA binders was give in the work of Chen et al [54]. In their work, Co x FeNiCrCu (x = 1, 1.5, 2, 2.5) HEAs were mechanically alloyed using high-energy ball milling from high purity (99.99 wt%) metals at a rotation rate of 400 rpm for 48 h, and with a ball-to-powder weight ratio of 6:1.…”

Section: Refinement Of Wc Grains By Use Of Hea Bindersmentioning

confidence: 99%

“…The WC-HEA powders were poured into a ∅20 graphite die and sintered in a spark plasma sintering (SPS) system at a uniaxial pressure of 30 MPa for 8 min at 1300, 1350, 1400 and 1450 • C. The conventional WC-10 wt.% Co alloys were also prepared for comparison. In Figure 1, the average size of the WC grains in the conventional WC-10 wt.% Co alloy and in WC-HEA (Co x FeNiCrCu, x = 1, 1.5, 2, 2.5) alloys sintered at 1400 • C is shown [54]. The CoFeNiCrCu HEA contained a mixture of fcc and bcc phases.…”

Section: Refinement Of Wc Grains By Use Of Hea Bindersmentioning

confidence: 99%

“…In the work of Chen et al [54] the WC-10 wt.% Co and WC-Co x FeNiCrCu (x = 1, 1.5, 2, 2.5) HEA alloys were sintered from pure powders under uniaxial pressure of 30 MPa at 1300, 1350, 1400 and 1450 • C. The studied HEA had an fcc lattice. The fracture toughness and hardness of the WC-10CoFeNiCrCu composites [54] are given in Table 3. An increase in the sintering temperature eliminated the porosity and increased density, thus improving the hardness values.…”

Section: Hardness and Fracture Toughnessmentioning

confidence: 99%

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WC-Based Cemented Carbides with High Entropy Alloyed Binders: A Review

Straumal

Konyashin

2023

Metals

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Cemented carbides have belonged to the most important engineering materials since their invention in the 1920s. Commonly, they consist of hard WC grains embedded in a cobalt-based ductile binder. Recently, attempts have been made to substitute the cobalt using multicomponent alloys without a principal component (also known as high entropy alloys—HEAs). HEAs usually contain at least five components in more or less equal amounts. The substitution of a cobalt binder with HEAs can lead to the refinement of WC grains; it increases the hardness, fracture toughness, corrosion resistance and oxidation resistance of cemented carbides. For example, a hardness of 2358 HV, fracture toughness of 12.1 MPa.m1/2 and compression strength of 5420 MPa were reached for a WC-based cemented carbide with 20 wt.% of the equimolar AlFeCoNiCrTi HEA with a bcc lattice. The cemented carbide with 10 wt.% of the Co27.4Cr13.8Fe27.4Ni27.4Mo4 HEA with an fcc lattice had a hardness of 2141 HV and fracture toughness of 10.5 MPa.m1/2. These values are higher than those for the typical WC–10 wt.% Co composite. The substitution of Co with HEAs also influences the phase transitions in the binder (between the fcc, bcc and hcp phases). These phase transformations can be successfully used for the purposeful modifications of the properties of the WC-HEA cemented carbides. The shape of the WC/binder interfaces (e.g., their faceting–roughening) can influence the mechanical properties of cemented carbides. The most possible reason for such a behavior is the modification of conditions for dislocation glide as well as the development and growth of cracks at the last stages of deformation. Thus, the substitution of a cobalt binder with HEAs is very promising for the further development of cemented carbides.

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Section: Refinement Of Wc Grains By Use Of Hea Bindersmentioning

confidence: 87%

Section: Refinement Of Wc Grains By Use Of Hea Bindersmentioning

confidence: 99%

Section: Refinement Of Wc Grains By Use Of Hea Bindersmentioning

confidence: 99%

Section: Hardness and Fracture Toughnessmentioning

confidence: 99%

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WC-Based Cemented Carbides with High Entropy Alloyed Binders: A Review

Straumal

Konyashin

2023

Metals

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“…Cemented carbide mostly uses Co as the bonding metal to guarantee that it meets the requirements for both high fracture toughness and outstanding abrasion resistance. Although Ni, a similar element to Co, is frequently difficult to apply in real‐world working settings because of the phenomenon of grain growth during the sintering process, it only appears in cemented carbide as a toughness and corrosion‐resistant element 5–6 . The study of cemented carbide with Ni and Co as bonding metals (hence collectively referred to as “Ni‐Co cemented carbide”) reveals that Ni is more soluble in WC than Co is during high‐temperature sintering and that Ni has lower hardness and strength than Co. Cemented carbide tends to have coarser grains when Ni is added, which significantly reduces the alloy's ability to withstand abrasion 7 .…”

Section: Introductionmentioning

confidence: 99%

Effect of WC particle size on the microstructure and mechanical properties of Ni–Co coarse grain cemented carbide

Zhao

Li³

et al. 2023

Int J Applied Ceramic Tech

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The effect of different WC grain size additions on the microstructure and grain distribution of Ni–Co coarse crystalline cemented carbide was studied. And then the effect of grain distribution on the mechanical properties of cemented carbide was discussed. The effect of WC grain size on the grain size and coherency of cemented carbide was analyzed by microstructure. And the distribution of grains in the microstructure was investigated by the truncation method. The addition of fine (1.1–1.4 μm), medium (2.3–2.7 μm), and coarse WC (5.6–6.0 μm) particles can increase the nucleation rate of WC grains in the bonded phase. And the higher grain growth driving force can produce the theoretical limitation of nucleation and inhibit the coarsening of WC grains to a certain extent. The WC grain size has an insignificant effect on the frequency of the occurrence of super‐coarse grains in coarse crystalline cemented carbide. The average grain size and super coarse grains in microstructure gradually decrease, which promotes the improvement of transverse rupture strength. The increase of the adjacent degree and the decrease of the mean free path reduce which is beneficial to the improvement of the corrosion resistance of the alloy. The best overall performance of the alloy is achieved when fine‐grained WC is added.

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