Strong high-entropy diboride ceramics with oxide impurities at 1800°C

Liu, Jie; Yang, Qingqing; Zou, Ji; Wang, Weimin; Wang, Xingang; Fu, Zhengyi

doi:10.1007/s40843-022-2287-7

Cited by 26 publications

(41 citation statements)

References 46 publications

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“…It has come to light that the improvement of hardness/strength could be achieved by solid-solution strengthening effect. [16][17][18][19][20][21][22][23][24] Previous studies conducted by Feng et al demonstrated that the solid solution of Cr could improve the hardness of TiB 2 . 18 (Cr 0.2 Hf 0.2 Ta 0.2 Ti 0.2 Zr 0.2 )B 2 also exhibited the highest Vickers hardness (48.3 GPa at 0.49 N) among a series of high-entropy diboride ceramics with different compositions.…”

Section: Introductionmentioning

confidence: 99%

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B₄C–(Ti_0.9Cr_0.1)B₂ composites with excellent specific hardness and enhanced toughness

et al. 2023

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Dense and light B4C–(Ti0.9Cr0.1)B2 composites with excellent mechanical properties were designed and reactively densified from boron, TiC, and Cr3C2 powder mixtures by spark plasma sintering in this work. Due to solid solution effects, the as‐obtained B4C–(Ti0.9Cr0.1)B2 composite exhibited obviously enhanced hardness (43.2 ± 3.0 GPa at 9.8 N) and higher specific hardness (12.82 GPa cm3 g−1) together with improved flexural strength (663 ± 39 MPa) and fracture toughness (KIC, 5.40 ± 0.25 MPa m1/2), compared to the counterparts such as B4C–TiB2 composite and B4C. Toughening contributions in the as‐sintered ceramics were quantitatively analyzed, and higher KIC in B4C–(Ti0.9Cr0.1)B2 was mainly due to their larger initial fracture toughness and compressive stress toughening. The combination of these properties makes B4C–(Ti0.9Cr0.1)B2 composites exhibit great potentials in the application as lightweight structural materials. This work provided an inspiration to achieve lightweight materials with high performance through doping minor‐amount atoms into the matrix.

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Section: Introductionmentioning

confidence: 99%

“…It has come to light that the improvement of hardness/strength could be achieved by solid‐solution strengthening effect 16–24 . Previous studies conducted by Feng et al.…”

Section: Introductionmentioning

confidence: 99%

B₄C–(Ti_0.9Cr_0.1)B₂ composites with excellent specific hardness and enhanced toughness

et al. 2023

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“…[1][2][3][4] Under the well-known four core effects, high-entropy ceramics have the advantages of large compositional design space, unique entropy effect, and adjustable properties. 2,3,5 For instance, the formability of a single phase can be related to the increased configurational entropy resulting from the complex composition, 1,6 and the lattice distortion effect can enhance thermal insulation property. [7][8][9][10][11] Additionally, the increase of mixing entropy leads to the enhancement of sluggish diffusion effect, which leads to a decreased grain growth rate during sintering.…”

Section: Introductionmentioning

confidence: 99%

“…High‐entropy ceramics have broken through the design idea of traditional ceramic materials and developed rapidly in recent years 1–4 . Under the well‐known four core effects, high‐entropy ceramics have the advantages of large compositional design space, unique entropy effect, and adjustable properties 2,3,5 . For instance, the formability of a single phase can be related to the increased configurational entropy resulting from the complex composition, 1,6 and the lattice distortion effect can enhance thermal insulation property 7–11 .…”

Section: Introductionmentioning

confidence: 99%

Grain growth inhibition by sluggish diffusion and Zener pinning in high‐entropy diboride ceramics

et al. 2023

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This work reported the grain growth kinetics of high‐entropy diboride (HEB) and HEB‐SiC ceramics containing 10, 20, and 30 vol% SiC during heat treatment at 1800°C. The coarsening of HEB phase occurred in the four kinds of ceramics during heat treatment, especially in HEB ceramics. The kinetic analysis showed that the grain growth of HEB phase in HEB and HEB‐SiC ceramics is controlled by interface‐controlled kinetics and grain‐boundary pinning, respectively. The growth rate constant of HEB grains is lower than ZrB2, which is related to the low grain‐boundary energy and the sluggish diffusion effect in dynamics of high‐entropy materials. The growth rate of matrix phase in HEB‐SiC ceramics is similar to that in ZrB2–SiC ceramics, indicating that the pinning effect of the SiC second‐phase played the dominant role in inhibiting the grain growth of the high‐entropy matrix phase and disguised the sluggish diffusion effect. This study reveals that the grain growth inhibition through sluggish diffusion effect in a high‐entropy ceramic system may be magnified by the possible existence of segregated second‐phase particles located at the grain boundaries.

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“…High‐entropy ceramics have attracted a lot of attention from researchers in recent years 1–4 . As a derivative of diboride ceramics, the high‐entropy diboride ceramics (HEBs) have inherited the advantages of the single‐component transition metal diboride ceramics (high melting point, oxidation resistance, and ablation resistance) 5–13 . Their low thermal conductivity caused by inherent lattice distortion is also attractive for the application in the field of ultrahigh temperature thermal protection 14–16 .…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of equiatomic high‐entropy diboride ceramics with 5–9 cations

Liu

Qin

et al. 2023

Int J Applied Ceramic Tech

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As a new type of high-entropy material, most of the current work has focused on the synthesis and characterization of mechanical properties of high-entropy diboride ceramics (HEBs). In this work, single-phase HEBs with 5-9 cations were prepared by spark plasma sintering with self-synthesized HEB powders through the boro/carbothermal reduction method. The distribution of the metal elements in the obtained HEBs was homogeneous. Due to the phonon scattering caused by the inherent lattice distortion in the HEBs, the thermal conductivity of the ceramics decreased with the increased configurational entropy or the number of cation kinds. However, this study reveals that the degree of reduction in thermal conductivity for the HEBs demonstrate a weakened tendency with cation kinds of more than 6.

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Strong high-entropy diboride ceramics with oxide impurities at 1800°C

Cited by 26 publications

References 46 publications

B₄C–(Ti_0.9Cr_0.1)B₂ composites with excellent specific hardness and enhanced toughness

B₄C–(Ti_0.9Cr_0.1)B₂ composites with excellent specific hardness and enhanced toughness

Grain growth inhibition by sluggish diffusion and Zener pinning in high‐entropy diboride ceramics

Thermal conductivity of equiatomic high‐entropy diboride ceramics with 5–9 cations

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Strong high-entropy diboride ceramics with oxide impurities at 1800°C

Cited by 26 publications

References 46 publications

B4C–(Ti0.9Cr0.1)B2 composites with excellent specific hardness and enhanced toughness

B4C–(Ti0.9Cr0.1)B2 composites with excellent specific hardness and enhanced toughness

Grain growth inhibition by sluggish diffusion and Zener pinning in high‐entropy diboride ceramics

Thermal conductivity of equiatomic high‐entropy diboride ceramics with 5–9 cations

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B₄C–(Ti_0.9Cr_0.1)B₂ composites with excellent specific hardness and enhanced toughness

B₄C–(Ti_0.9Cr_0.1)B₂ composites with excellent specific hardness and enhanced toughness