A novel medium heavy alloy (MHA) with excellent static/dynamic properties and impact toughness

Li, Y.; Liu, G.Q.; Hu, Xiaobing; Wu, Li; Tan, Chen Wen; Dravid, Vinayak P.; Liu, S.Z.

doi:10.1016/j.scriptamat.2018.11.036

Cited by 22 publications

(7 citation statements)

References 43 publications

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“…However, numerous tiny precipitates can be found in the tensile sample at 600 • C. It is also found that the number of slip bands is drastically reduced compared with the sample tested at 400 • C, as shown in Figure 4c. The diffraction patterns of the NiW phase are shown in Figure 4d, which is similar to some previous work [5,[14][15][16][17]. The orientation relationship between the matrix and NiW phase is (200) Ni //(240) NiW and [001]Ni//[001] NiW .…”

Section: Tem Analyses Of the Deformation Areas Of Sample Tensile At Different Temperaturessupporting

confidence: 85%

“…Heavy alloys have been widely applied in aerospace, aviation, military, and nuclear fields due to their high mechanical properties, good oxidation resistance, high damping behavior, and excellent fatigue performance [1][2][3][4][5]. Traditional high heavy alloys mainly include ultrahigh-strength steel and high-density tungsten alloys [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the impact toughness of tungsten alloys is low due to the inherent weakness deformability of tungsten at room temperature, which is prone to fracture and failure [11][12][13]. Ni-W-based face-centered cubic alloys are newly developed heavy alloys that have attracted attention recently [5,14,15]. These alloys not only have high density but also have high strength and good plasticity.…”

Section: Introductionmentioning

confidence: 99%

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The Deformation Behaviors and Mechanism of the High-Temperature Mechanical Properties of a Ni48W35Co17 Alloy

Xie

Xue

et al. 2021

Metals

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Investigations of the plastic deformation mechanisms of Ni-W-based heavy alloys varying with increasing temperatures are very important for the development of hot forming processes and applications at elevated temperatures. In this study, the continuous variation of strength and plasticity of a novel Ni-W-based heavy alloy with increasing temperatures was investigated. The tensile strength of a Ni48W35Co17 sample at 600 °C was 471 MPa, which was 47% lower than that at 100 °C. A variation in an abnormal decrease in elongations at temperatures from 400 °C to 800 °C was found in this alloy. The elongation rate of the sample tensile at 600 °C was 19%, which was 73% lower than that at 100 °C. A microstructural analysis revealed that the number of twins in the sample tensile at a temperature higher than 600 °C increased considerably compared with the sample tensile at lower temperatures, indicating that the dislocation slips were suppressed during the high-temperature stretching process. The precipitates of the NiW phase were found in the 600 °C tensile sample, which was not clearly observed in the 400 °C tensile sample, suggesting that dislocation slips were affected by the formation of these precipitates. Moreover, the orientation relationship between the matrix and NiW phase was (200)Ni//(240)NiW and [001]Ni//[001]NiW. The tiny precipitated phase was the main reason for the plasticity decrease of the alloy with the temperature increase.

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Section: Tem Analyses Of the Deformation Areas Of Sample Tensile At Different Temperaturessupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Deformation Behaviors and Mechanism of the High-Temperature Mechanical Properties of a Ni48W35Co17 Alloy

Xie

Xue

et al. 2021

Metals

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“…However, no second-phase particle is found in Figure 5. In previous studies, it was found that the precipitation of the second phase in the alloy would take a long time, and no second phase precipitation occurs in a short period of time [22]. So the second phase does not need to be considered in this study.…”

Section: Transmission Electron Microscopy Analysis Of the Microstructurementioning

confidence: 99%

“…It possesses the characteristics of high strength and toughness, excellent dynamic performance similar to that of ultrahigh-strength steel, and high density and high temperature resistance similar to those of tungsten alloys. It is a novel MHA material with excellent overall performance [22]. However, the Ni-W-Co-Ta MHA had some problems after casting, such as coarse grains, poor plasticity at high temperatures, ease of cracking during forging, etc., which seriously limit its applications in industrial production.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Tensile Behavior of an As-Cast Ni-W-Co-Ta Medium–Heavy Alloy

Li,

Xiong,

Tang

et al. 2024

Coatings

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High-temperature tensile experiments with tensile rates ranging from 0.01 s−1 to 10 s−1 were carried out at various temperatures ranging from 1000 °C to 1250 °C with a Gleeble-3800 thermal simulation tester to evaluate the physical properties of an as-cast Ni–W–Co–Ta medium–heavy alloy. The microstructure evolution of the alloy during high-temperature stretching was characterized by metallographic microscopy, scanning electron microscopy, and transmission electron microscopy. The results indicated the emergence of multiple slip lines and the parallel arrangement of dislocations in the grain of the alloy after high-temperature stretching, and typical characteristics of plane slipping were observed. The plasticity of the Ni–W–Co–Ta medium–heavy alloy increased, but its strength decreased with an increase in the deformation temperature. In contrast, an increase in the strain rate resulted in a noticeable increase in the strength and plasticity of the medium–heavy alloy. The experiments revealed that the maximum tensile strength of the as-cast Ni–W–Co–Ta medium–heavy alloy was 735 MPa (T = 1000 °C, ε˙ = 10 s−1). Additionally, the maximum reduction in area and elongation was 38.1% and 11.8% (T = 1250 °C, ε˙ = 10 s−1), respectively. The mode of fracture after high-temperature tensile deformation was brittle fracturing.

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Effect of Aging Treatment on the Microstructure and Properties of a Novel Medium-Heavy NiWCoTa Alloy Subjected to Pre-deformation

Xiong

et al. 2022

J. of Materi Eng and Perform

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A novel medium heavy alloy (MHA) with excellent static/dynamic properties and impact toughness

Cited by 22 publications

References 43 publications

The Deformation Behaviors and Mechanism of the High-Temperature Mechanical Properties of a Ni48W35Co17 Alloy

The Deformation Behaviors and Mechanism of the High-Temperature Mechanical Properties of a Ni48W35Co17 Alloy

High-Temperature Tensile Behavior of an As-Cast Ni-W-Co-Ta Medium–Heavy Alloy

Effect of Aging Treatment on the Microstructure and Properties of a Novel Medium-Heavy NiWCoTa Alloy Subjected to Pre-deformation

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