Distinct properties of tungsten austenitic stainless alloy as a potential nuclear engineering material

Salama, E.; Eissa, Mamdouh; Tageldin, A.S.

doi:10.1016/j.net.2018.12.021

Cited by 16 publications

(6 citation statements)

References 23 publications

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“…Table 2 provides intuitive data. Although the simultaneous enhancement of strength and ductility of CoCrNi has been reported, it is inspirational that CoCrNiAl 0.1 Si 0.1 has an excellent combination of strength and ductility compared with CoCrNi, CoCrNiFe, CoCrNiFeMn, FeCoCrNiAl x [6,[8][9][10], high-Mn steels [11], austenitic stainless steels [24], and high-Ni steels [25], particularly at 77 K, as shown in Figure 3.…”

Section: Mechanical Propertiesmentioning

confidence: 92%

Enhanced Strength and Plasticity of CoCrNiAl0.1Si0.1 Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature

Liu¹,

Meng

Chang

et al. 2021

Materials

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The synthesis of lightweight yet strong-ductile materials has been an imperative challenge in alloy design. In this study, the CoCrNi-based medium-entropy alloys (MEAs) with added Al and Si were manufactured by vacuum arc melting furnace subsequently followed by cool rolling and anneal process. The mechanical responses of CoCrNiAl0.1Si0.1 MEAs under quasi-static (1 × 10−3 s−1) tensile strength showed that MEAs had an outstanding balance of yield strength, ultimate tensile strength, and elongation. The yield strength, ultimate tensile strength, and elongation were increased from 480 MPa, 900 MPa, and 58% at 298 K to 700 MPa, 1250 MPa, and 72% at 77 K, respectively. Temperature dependencies of the yield strength and strain hardening were investigated to understand the excellent mechanical performance, considering the contribution of lattice distortions, deformation twins, and microbands. Severe lattice distortions were determined to play a predominant role in the temperature-dependent yield stress. The Peierls barrier height increased with decreasing temperature, owing to thermal vibrations causing the effective width of a dislocation core to decrease. Through the thermodynamic formula, the stacking fault energies were calculated to be 14.12 mJ/m2 and 8.32 mJ/m2 at 298 K and 77 K, respectively. In conclusion, the enhanced strength and ductility at cryogenic temperature can be attributed to multiple deformation mechanisms including dislocations, extensive deformation twins, and microbands. The synergistic effect of multiple deformation mechanisms lead to the outstanding mechanical properties of the alloy at room and cryogenic temperature.

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Section: Mechanical Propertiesmentioning

confidence: 92%

Enhanced Strength and Plasticity of CoCrNiAl0.1Si0.1 Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature

Liu¹,

Meng

Chang

et al. 2021

Materials

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“…To reduce these elements is an important task for alloy design. One proposal is to interchange molybdenum with tungsten [67], and the other is nickel and molybdenum with manganese and silicon [68]. Tungsten is commonly used in steels as a ferrite former and not so much in austenitic steels.…”

Section: Conclusion and Future Studies Requiredmentioning

confidence: 99%

Effects of alloying elements Mn, Mo, Ti, Si, P and C on the incubation period of void swelling in austenitic stainless steels

Yoshiie

2021

Tungsten

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Void swelling, which induces the degradation of the original properties of nuclear materials under high-energy particleirradiation, is an important problem. The incubation period, a transient stage before the steady void growth, determines the duration of service of nuclear materials. Several experimental studies have been performed on void observations by transmission electron microscopy (TEM), which, however, has a resolution limit for the size of defect clusters. Positron annihilation lifetime spectroscopy (PALS) enables the detection of small vacancy clusters, single vacancies, dislocations and precipitates. The use of these two methods provides complementary information toward detecting defect information in the incubation period. Here, defect structures during the incubation period in austenitic stainless steels, by means of PALS and TEM are reviewed. The role of alloying elements into determining the period is explained. Furthermore, the existing problems and research directions in this field are presented.

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“…This ceramic is used in industrial segments like aerospace, defence, automotive, oil and mineral exploration, as well as within the construction sector [5]. Similarly, it is well known to provide steel and super alloys [6].…”

Section: Introductionmentioning

confidence: 99%

Geometric Characterization of Local Changes in Tungsten Microneedle Tips after In-Vivo Insertion into Peripheral Nerves

2022

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Peripheral neural interfaces are used to connect the peripheral nervous system to high-tech robotic devices and computer interfaces. Soft materials are nowadays used to build the main structural part of these interfaces because they are able to mimic the mechanical properties of peripheral nerves. However, if on the one hand soft materials provide effective connections, reducing mechanical mismatch with nervous tissues and creating a close contact between active sites and neural fibers, on the other hand, most of them are not mechanically stable during implantation. As a consequence, tungsten (W) microneedles are used to insert soft neural interfaces, because they are able to pierce the peripheral nervous tissue because of their high stiffness. Nevertheless, this stiffness cannot prevent microneedles from local microscopic structural damage, even after successful insertions. In addition, the nature of this damage is not totally clear. Therefore, this work aimed at quantitatively investigating the phenomenological changes of the microneedles’ tip shape after insertion into the in vivo peripheral nerves. In particular, a quantification of the interactions between peripheral nerves and W microneedles was proposed through the Oliver-Pharr formula, and the interaction force was found to be directly proportional to the power < m > = 2.124 of the normalized indentation depth. Moreover, an experimental correlation between insertion force and the opening tip angle was described together with an assessment of the minimum diameter to effectively puncture the peripheral nervous tissue. Finally, a computational framework was presented to describe the local changes affecting the microneedles’ tip shape. This approach was able to detect a bulging phenomenon along with the microneedle tips with a characteristic amplitude of approximately 100 μm, and a folding phenomenon, with a characteristic mean amplitude of less than 20 μm, affecting the extreme ending sections of the microneedle tips. These geometrical changes were related to the synergistic action of interaction forces likely resulting in compression and elastic instability of the tip.

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Distinct properties of tungsten austenitic stainless alloy as a potential nuclear engineering material

Cited by 16 publications

References 23 publications

Enhanced Strength and Plasticity of CoCrNiAl0.1Si0.1 Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature

Enhanced Strength and Plasticity of CoCrNiAl0.1Si0.1 Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature

Effects of alloying elements Mn, Mo, Ti, Si, P and C on the incubation period of void swelling in austenitic stainless steels

Geometric Characterization of Local Changes in Tungsten Microneedle Tips after In-Vivo Insertion into Peripheral Nerves

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