Strengthening mechanism of aluminum nitride ceramics from 293 to 77K

Wei, Sai; Xie, Zhihui; Xue, Weimin; Yi, Zhen; Chen, Juan; Cheng, Long

doi:10.1016/j.matlet.2013.12.096

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…In order to increase the strength, higher fracture toughness and small defect size are desired. The strength of ceramics is statistical in nature and the Weibull distribution has been widely used to analyze the scatter in strengths [14]. The probability of failure in two parameters Weibull distribution is given by:…”

Section: Resultsmentioning

confidence: 99%

“…Reliability can be defined as the probability of survival at a given stress level. Weibull statistics is based on the weakest link theory, which means that the most serious flaw in the material will control the strength, like a chain breaking if its weakest link fails [13,14]. Two-parameter Weibull distribution, which defines the reliability at a given stress level in terms of the characteristic flexural strength, σ 0 , and the Weibull modulus, m, was used to analyze the strength of the specimens in the present study.…”

Section: Introductionmentioning

confidence: 99%

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Processing and mechanical characterization of Al2O3/Ni and Al2O3/C0 composites by pressureless sintering of nanocomposite powders

Kafkaslıoğlu

Yılmaz

Tür

2018

PAC

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Al 2 O 3 /Ni and Al 2 O 3 /Co nanopowder mixtures (with 3 vol.% of metallic phase) were synthesized by heterogeneous precipitation method. In order to increase the green strength, polypropylene carbonate (PPC) was used as a binder while preparing green compacts. Uniaxially pressed powder mixtures were sintered at 1550°C for 2 h in a reducing atmosphere. The effects of Ni and Co nanophases on the microstructure and mechanical properties of Al 2 O 3 ceramics were studied by X-ray diffraction, scanning electron microscopy, Vickers indentation technique and three-point bending tests. The metallic phase hindered the densification of alumina matrix, yet hardness values of Al 2 O 3 , Al 2 O 3 /Ni, and Al 2 O 3 /Co composites were comparable. Vickers fracture toughness results indicate that the composites have higher fracture toughness, but the characteristic flexural strength and Weibull modulus are higher for the pure Al 2 O 3 .

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processing and mechanical characterization of Al2O3/Ni and Al2O3/C0 composites by pressureless sintering of nanocomposite powders

Kafkaslıoğlu

Yılmaz

Tür

2018

PAC

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“…The mixture of raw AlN powder with 5 wt.% Y 2 O 3 powder was pressed (cold isostatic pressing) into blocks and then sintered at 1850 • C for 2 h under an N 2 gas pressure of 0.1 MPa by Wei et al [12]. The blocks, cut with dimensions of 3 mm × 4 mm × 36 mm and polished with diamond pastes, were tested at temperatures of 77 K, 195 K, and 293 K using a three-point bending test.…”

Section: Flexural Strength Of Aluminum Nitride Ceramicsmentioning

confidence: 99%

Four-Parameter Weibull Distribution with Lower and Upper Limits Applicable in Reliability Studies and Materials Testing

Kohout

2023

Mathematics

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A simply curved Weibull plot means that the studied data set has a three-parameter Weibull distribution with a non-zero location parameter representing the lower or the upper limit of the data set. This paper introduces a four-parameter Weibull distribution with both of these limits that can be applied in both reliability and materials engineering. A very reliable indicator of this distribution is the double-curved Weibull plot. The great advantage of this distribution is the fact that the corresponding hazard rate curve can be bathtub-shaped with a great ability to fit the measured data.

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“…In recent years, many researches based on indentation have been performed to study the characteristics of materials at cryogenic temperatures. For instance, Wei et al 5 carried out the research to investigate the strengthening mechanism of aluminum nitride (AIN) ceramics from 293 to 77 K. They found that the increase of fracture surface energy and elastic modulus could be conducive to the strengthening of AlN ceramics at cryogenic temperatures. Yi et al 6 studied the fracture behaviour of silicon carbide at cryogenic temperatures and found that both the hardness and fracture toughness increased with temperature decreasing.…”

mentioning

confidence: 99%

Molecular dynamics investigations of mechanical behaviours in monocrystalline silicon due to nanoindentation at cryogenic temperatures and room temperature

Zhao

Zhang

et al. 2015

Sci Rep

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Molecular dynamics simulations of nanoindentation tests on monocrystalline silicon (010) surface were conducted to investigate the mechanical properties and deformation mechanism from cryogenic temperature being 10 K to room temperature being 300 K. Furthermore, the load-displacement curves were obtained and the phase transformation was investigated at different temperatures. The results show that the phase transformation occurs both at cryogenic temperatures and at room temperature. By searching for the presence of the unique non-bonded fifth neighbour atom, the metastable phases (Si-III and Si-XII) with fourfold coordination could be distinguished from Si-I phase during the loading stage of nanoindentation process. The Si-II, Si-XIII, and amorphous phase were also found in the region beneath the indenter. Moreover, through the degree of alignment of the metastable phases along specific crystal orientation at different temperatures, it was found that the temperature had effect on the anisotropy of the monocrystalline silicon, and the simulation results indicate that the anisotropy of monocrystalline silicon is strengthened at low temperatures.

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Strengthening mechanism of aluminum nitride ceramics from 293 to 77K

Cited by 9 publications

References 16 publications

Processing and mechanical characterization of Al2O3/Ni and Al2O3/C0 composites by pressureless sintering of nanocomposite powders

Processing and mechanical characterization of Al2O3/Ni and Al2O3/C0 composites by pressureless sintering of nanocomposite powders

Four-Parameter Weibull Distribution with Lower and Upper Limits Applicable in Reliability Studies and Materials Testing

Molecular dynamics investigations of mechanical behaviours in monocrystalline silicon due to nanoindentation at cryogenic temperatures and room temperature

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