Fracture toughness of W heavy metal alloys

Zamora, K.; Sevillano, J. Gil; Perez, Marcos

doi:10.1016/0921-5093(92)90022-s

Cited by 23 publications

(3 citation statements)

References 23 publications

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“…In the pre-crack region (Figure 7c), some cleavage facets, intergranular cleavage, and faceted striation are observed, which indicate minimum plastic deformation during tensile fatigue pre-cracking. Meanwhile, ductile dimple fracture morphology is evident in stable crack growth region during J-R test with static loading [8].…”

Section: Fracture Toughness Test Resultsmentioning

confidence: 97%

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Measurement of Fracture Toughness of Pure Tungsten Using a Small-Sized Compact Tension Specimen

et al. 2020

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The evaluation of fracture toughness of pure tungsten is essential for the structural integrity analysis in a fusion reactor. Therefore, the accurate quantification of fracture toughness of tungsten alloys is needed. However, due to the inherent brittleness of tungsten, it is difficult to introduce a sharp fatigue pre-crack needed for the fracture toughness test. In this study, a novel fatigue pre-cracking method was developed and applied to the small-sized disc-type compact tension (DCT) specimens of double-forged pure tungsten. To overcome the brittleness and poor oxidation resistance, a low-frequency tensile fatigue pre-cracking was performed at 600 °C in Ar environment, which resulted in the introduction of a sharp pre-crack to DCT specimens. Then, fracture toughness tests were conducted at room temperature (RT), 400 °C, and 700 °C in air and Ar gas environments using as-machined and pre-cracked DCT specimens. At RT and 400 °C, the test environment and crack tip radius did not affect the fracture toughness measurement. However, at 700 °C, the Ar gas environment and the presence of a sharp fatigue pre-crack resulted in a decrease in the measured fracture toughness. Thus, it was suggested that, for the conservative fracture toughness measurement of pure tungsten, fatigue pre-cracking and fracture toughness test should be performed in an inert environment, especially for high-temperature tests.

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Section: Fracture Toughness Test Resultsmentioning

confidence: 97%

“…Therefore, evaluation of fracture toughness of W is essential to structural integrity analysis of W diverters. Nonetheless, published fracture toughness data and related studies are rare in current literature [5,8].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Fracture Toughness of Pure Tungsten Using a Small-Sized Compact Tension Specimen

et al. 2020

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“…Tungsten heavy alloys (WHAs) have the advantages of high densities (16-18.5 g/cm), 1 high melting point, 2,3 and wonderful properties such as high strength, high fracture toughness, good corrosion resistance, and so on. 4,5 WHAs are composite materials where body-centered cubic (BCC) tungsten particles are randomly embedded in a face-centered cubic (FCC) matrix. Tungsten particles are of high hardness and low ductility, while the matrix exhibits a good ductility but a low strength.…”

Section: Introductionmentioning

confidence: 99%

Comparative studies of the constitutive models for tungsten heavy alloy (95W-3.5Ni-1.5Fe) at high strain rates

Lai

Wang

Qin

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The plastic behaviors’ description of a tungsten heavy alloy (95W-3.5Ni-1.5Fe) at temperatures of 298–773 K and strain rates of 0.001–11,000 s−1 is systematically studied based on four constitutive models, that is, Zerilli-Armstrong model, modified Zerilli-Armstrong model, Mechanical Threshold Stress model, and modified Mechanical Threshold Stress model. The quasi-static compression experiments using an electronic universal testing machine and the dynamic compression experiments using a split Hopkinson pressure bar apparatus are employed to obtain the true stress–strain curves at a total of three temperatures (298 K, 573 K, and 773 K) and a wide range of strain rates (0.001–11,000 s−1). The parameters of the four constitutive models are obtained by the above fundamental experimental data and Grey Wolf Optimizer. The correlation coefficient and average absolute relative error are used to evaluate the predicted performance of these models. Modified Mechanical Threshold Stress model is found to have the highest predicted performance in describing the flow stress of the 95W-3.5Ni-1.5Fe alloy. Eventually, two compression experiments whose loading conditions are not in the fundamental experiments are conducted to validate the four models.

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Variation of the mechanical properties of tungsten heavy alloys tested at different temperatures

Islam

2011

Rare Metals

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The high-temperature mechanical properties of 95W-3.5Ni-1.5Fe and 95W-4.5Ni-0.5Co alloys were investigated in the temperature range of room temperature to1100°C. The yield strength and tensile strengths declined gradually, and the ductility of both alloys increased as the testing temperature was increased to 300°C. All the three properties reached a plateau at temperatures between 300 and 500°C in the case of 95W-3.5Ni-1.5Fe and at temperatures between 350 and 700°C in the case of 95W-4.5Ni-0.5Co. Thereafter, the ductility as well as yield and tensile strengths decreased considerably.

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Fracture toughness of W heavy metal alloys

Cited by 23 publications

References 23 publications

Measurement of Fracture Toughness of Pure Tungsten Using a Small-Sized Compact Tension Specimen

Measurement of Fracture Toughness of Pure Tungsten Using a Small-Sized Compact Tension Specimen

Comparative studies of the constitutive models for tungsten heavy alloy (95W-3.5Ni-1.5Fe) at high strain rates

Variation of the mechanical properties of tungsten heavy alloys tested at different temperatures

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