Mechanical and tribological behaviors of hard and tough TaxHf1−xN films with various Ta contents

Zhao, Xing; Li, Hang; Li, Jianliang; Hu, Jiaojiao; Huang, Jingjing; Kong, Jian; Wu, Qiujie; Yan, Shi; Xiong, Dangsheng

doi:10.1016/j.surfcoat.2020.126412

Cited by 19 publications

(7 citation statements)

References 45 publications

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“…. This finding not only enriches knowledge Figure 4 (a) Vickers hardness and Young's modulus of HECs with the standard deviation of the error bar; (b) fracture toughness of HECs and the data reported in the literature [10,[38][39][40][41][42][43] with the standard deviation of error bar; (c) SEM image of Vickers indentation initiated by a load of 98 N on the well-polished surface of HEC-3; (d) SEM image of the fracture surface of HEC-3, indicating the presence of the ball-like particle boundary; (e) EDS compositional maps of (d). .…”

Section: Science China Materialssupporting

confidence: 81%

“…4b). In particular, the K IC value of HEC-3 is almost three times greater than that of metal carbides and nitrides [10,[40][41][42][43][44][45], which perhaps implies the beneficial effect of the multi-anionic structure on fracture toughness. To investigate the propagation behavior of cracks, HEC-3 was selected for analysis.…”

Section: Science China Materialsmentioning

confidence: 96%

“…All the radial cracks exhibit a zigzag propagation path in HEC-3 (denoted by the arrows in Fig. 4c), while the radial crack from the indentation exhibits a straight propagation path in traditional single-phase structural ceramics [43,44]. To further investigate its toughening mechanism, the fracture morphology of HEC-3 was analyzed in detail.…”

Section: Science China Materialsmentioning

confidence: 99%

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High-entropy carbide-nitrides with enhanced toughness and sinterability

Zhang

Cai

et al. 2021

Sci. China Mater.

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High-entropy ceramics (HECs) have attracted much attention due to their huge composition space, unique microstructure, and desirable properties. In contrast to previous studies, which have primarily focused on HECs with one anion, herein, we report a new family of ceramics with both multi-cationic and-anionic structures, i.e., high-entropy carbide-nitrides (Ti 0.33 Zr 0.33 Hf 0.33)(C 0.5 N 0.5), (Ti 0.25 Zr 0.25 Hf 0.25-Nb 0.25)(C 0.5 N 0.5) and (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2)(C 0.5 N 0.5). These as-synthesized HECs are mainly comprised of a face-centered cubic solid-solution phase accompanied by minor inevitable oxide phases. The formation mechanism of the solid-solution phase is discussed in terms of the lattice size difference and thermodynamic competition between configurational entropy and mixing enthalpy. It is found that the increment in the configurational entropy can effectively lower the sintering temperature and increase the fracture toughness. Particularly, the newly developed (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2)(C 0.5 N 0.5) exhibits a decent fracture toughness of 8.4 MPa m 1/2 and a low sintering temperature of 1750°C, making it promising for ultra-high temperature applications. Our work not only enriches knowledge regarding the HECs categories, but also opens a new pathway for developing HECs with multi-cationic and-anionic structures.

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Section: Science China Materialssupporting

confidence: 81%

Section: Science China Materialsmentioning

confidence: 96%

Section: Science China Materialsmentioning

confidence: 99%

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High-entropy carbide-nitrides with enhanced toughness and sinterability

Zhang

Cai

et al. 2021

Sci. China Mater.

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“…Although nucleate agglomerations grow in the shape of islands, they contact each other and turn into lamellar growth before they grow up. On the other hand, doping of Ta increases the compressive stress during the growth of islands [40], and the effect of the stress suppression on the edge of islands also makes the size of islands more uniform [41]. In the chemical composition of spot 3 in the convex area, the atom percent of C is approximately equal to the sum of Hf and Ta, the atomic percentage of tantalum and hafnium is about 1:1, indicating that the chemical composition of solid solution is Hf 0.5 Ta 0.5 C. The content of C on spot 4 in the concave area is slightly higher than the sum of Hf and Ta, demonstrating that in addition to the existence of Hf 0.5 Ta 0.5 C, there is also a small amount of graphite, which is also consistent with the XRD pattern in Figure 3.…”

Section: Characterization Of Coatingsmentioning

confidence: 99%

“…The concave and convex in the HfTaC 2 coatings are not as evident as those in the HfC coatings, the reason for which is that besides Hf and C atoms, there are also Ta atoms, face-centered cubic hafnium carbide and tantalum carbide formed solid solution with single-phase characteristics. The radius of hafnium and tantalum atoms are different, lattice distortion occurred when solid solution was formed, which made the uniformity of island size enhanced because of the stress suppression at the island edges [40,41]. Another reason for the small surface roughness value of the HfTaC 2 coatings is that the sputtering rate of tantalum is large, so the nucleation position on the surface of the matrix increases, forming a small size and a large number of islands.…”

Section: Mechanism Of Coating Growthmentioning

confidence: 99%

Functionally Gradient Coatings from HfC/ HfTaC2 to Ti: Growth Process, Basic Mechanical Properties and Wear Behavior

Miao

Liang

et al. 2022

Coatings

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HfC and HfTaC2 coatings with gradient composition manufactured by double-cathode glow discharge plasma surface metallurgy technology were designed to improve the wear resistance of TA15 titanium alloy. The deposition mechanism of plasma and diffusion mechanism of atoms were investigated, and the growth process of coatings was revealed. The mechanical properties comprising microhardness and elastic modulus were investigated via first-principles calculations and experimental verification. The results reveal that the wear resistance of HfC and HfTaC2 coatings with abrasive wear mechanism is always better than that of the substrate with abrasive wear, adhesive wear and oxidation wear mechanism. The volume wear rates of the coatings are reduced by 90%–97% compared with the substrate, and that of HfTaC2 coatings are reduced by 29.9%–45.5% compared with HfC coatings. Furthermore, V-shaped cross section profiles of wear scars formed on HfC coatings, and U-shaped on HfTaC2 coatings, which is attributed to the addition of tantalum which causes HfC to form a sufficient solid solution, a 0.187–0.030 Å elongation of Ta-C bond length and 0.039–0.051 Å shortening of Hf-C bond length led to the unit cell shrinkage and the Bragg lattice changes from face-centered cubic to face-centered square lattice; accordingly, hardness and wear behavior were further improved.

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Uncovering the effects of chemical disorder on the irradiation resistance of high-entropy carbide ceramics

Li,

Zhao,

2024

Acta Materialia

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Mechanical and tribological behaviors of hard and tough TaxHf1−xN films with various Ta contents

Cited by 19 publications

References 45 publications

High-entropy carbide-nitrides with enhanced toughness and sinterability

High-entropy carbide-nitrides with enhanced toughness and sinterability

Functionally Gradient Coatings from HfC/ HfTaC2 to Ti: Growth Process, Basic Mechanical Properties and Wear Behavior

Uncovering the effects of chemical disorder on the irradiation resistance of high-entropy carbide ceramics

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