Temperature dependent fracture toughness of the particulate-reinforced ultra-high-temperature-ceramics considering effects of change in critical flaw size and plastic power

Wang, Ruzhuan; Li, Dingyu; Wang, Xiaorong; Li, Weiguo

doi:10.1016/j.compositesb.2018.09.049

Cited by 13 publications

(5 citation statements)

References 23 publications

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“…This is completely consistent with the experimental phenomenon. The fracture toughness and hardness of materials are also related to the sizes of big grains, preexisting microflaws and micropores [ 22 , 23 , 24 ]. Figure 5 also indicates that there is no obvious difference in the toughening mechanism of Al 2 O 3 -1.0 wt % graphene composites prepared at different sintering temperatures.…”

Section: Resultsmentioning

confidence: 99%

Effects of Preparation Methods on the Microstructure and Mechanical Properties of Graphene-Reinforced Alumina Matrix Composites

Zhang

Jia

et al. 2022

Materials

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Recent years have witnessed a growing research interest in graphene-reinforced alumina matrix composites (Al2O3-G). In this paper, to better achieve the dispersion of graphene in composites, a ball milling method for adding raw materials step by step, called stepwise feeding ball milling, was proposed. The Al2O3-1.0 wt % graphene composites were prepared by this stepwise feeding ball milling and hot pressing. Then, the effects of sintering temperature and sintering pressure on the microstructure and mechanical properties of composites were studied. Results showed that the bending strength, fracture toughness and Vickers hardness of composites increased firstly and then decreased with increasing sintering temperature. The mechanical properties of composites were all at their maximum with the sintering temperature of 1550 °C. For example, the bending strength of composites reached 754.20 MPa, which was much bigger than 478.03 MPa at 1500 °C and 364.01 MPa at 1600 °C. Analysis suggested that the strength of composites was mainly related to the grain size, microflaw size and porosity.

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Section: Resultsmentioning

confidence: 99%

Effects of Preparation Methods on the Microstructure and Mechanical Properties of Graphene-Reinforced Alumina Matrix Composites

Zhang

Jia

et al. 2022

Materials

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“…This is completely consistent with the experimental phenomenon. The hardness and fracture toughness are also controlled by the critical flaw including grain, preexisting microflaws and micropores (Wang et al, 2019;Wang et al, 2021a;Wang et al, 2021b). Figure 2 shows that the fracture mode of Al 2 O 3 is mainly intergranular fracture.…”

Section: Resultsmentioning

confidence: 99%

Effects of graphene content on the microstructure and mechanical properties of alumina-based composites

Zhu

Jia

et al. 2022

Front. Mater.

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In this work, alumina-graphene (Al2O3-G) composites with graphene contents ranging from 0.5 to 3% were prepared by stepwise feeding ball milling and hot pressing. The influences of graphene content on the microstructure and mechanical properties of Al2O3-G composites were investigated. Results showed that the densification, grain sizes, flexural strength, fracture toughness and Vickers hardness of materials increased firstly and then decreased with increasing graphene contents. When the graphene content was 1%, the value of each performance parameter reached the maximum. The average grain size of material decreased from 991 to 551 nm as the graphene content increased from 0 to 1%, but it increased to 863 nm when the graphene content was 3%. The flexural strength, fracture toughness and Vickers hardness of composites with graphene content of 1% increased to 763.5 MPa, 7.4 MPa m1/2 and 21.28 GPa. Compared with the Al2O3, the fracture strength and toughness of the composites increased by up to 54.63 and 65.54%. Analysis suggested that the strength of Al2O3-G composites was mainly related to the grain size and preexisting microflaws.

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“…According to Wang et al, [30] mode-І fracture toughness at different temperatures can be formulated as (7) where K ІC ðT 0 Þ is mode-І fracture toughness at reference temperature T 0 .…”

Section: Temperature and Grain Size-dependent Ys Modelmentioning

confidence: 99%

“…According to Wang et al, [ 30 ] mode‐ І fracture toughness at different temperatures can be formulated as

K_{І C} false(T false) = K_{І C} false(T_{0} false) [\frac{false(1 - ν {false(T_{0} false)}^{2} false) E false(T false)}{false(1 - ν {false(T false)}^{2} false) E false(T_{0} false)} {(1 - \frac{\int_{T_{0}}^{T} C_{P} false(T false) d T}{\int_{T_{0}}^{T_{m}} C_{P} false(T false) d T + Δ H_{normalM}})]}^{0.5}

where

K_{І C} false(T_{0} false)

is mode‐ І fracture toughness at reference temperature T 0 .…”

Section: Theoretical Derivationsmentioning

confidence: 99%

Theoretical Characterization of the Temperature and Grain Size‐Dependent Yield Strength of Fine‐Grained Metals

Dong

et al. 2023

Adv Eng Mater

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Due to the characteristics of high strength and high toughness, fine‐grained metals have a high application value in aerospace and defense industries. There are numerous studies to characterize the effects of temperature or grain size on yield strength separately. However, the model that can consider the combined effects of temperature and grain size is rarely reported. Herein, based on the temperature‐dependent yield strength model and elastic modulus model established by the force–heat equivalence energy density principle, and considering the effect of grain boundary sliding, a temperature and grain size‐dependent yield strength model of fine‐grained metals which can take grain boundary sliding into account is developed. The model can predict the yield strength of fine‐grained metals using an easily obtained yield strength at the coarse‐grain size and an arbitrary reference temperature (usually room temperature). The predictions are in good agreement with all the available experimental data, which verifies the rationality of the proposed model. The quantitative influences of Young's modulus and fracture toughness on the yield strength at different temperatures and grain sizes are discussed, and useful suggestions for the preparation of fine‐grained metals with higher yield strength from 77 K to 0.4 T m are put forward.

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Temperature dependent fracture toughness of the particulate-reinforced ultra-high-temperature-ceramics considering effects of change in critical flaw size and plastic power

Cited by 13 publications

References 23 publications

Effects of Preparation Methods on the Microstructure and Mechanical Properties of Graphene-Reinforced Alumina Matrix Composites

Effects of Preparation Methods on the Microstructure and Mechanical Properties of Graphene-Reinforced Alumina Matrix Composites

Effects of graphene content on the microstructure and mechanical properties of alumina-based composites

Theoretical Characterization of the Temperature and Grain Size‐Dependent Yield Strength of Fine‐Grained Metals

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