Fabrication, characterization, and mechanical properties of 93W–4.9Ni–2.1Fe/95W–2.8Ni–1.2Fe–1Al2O3 heavy alloy composites

Hu, Ke; Li, Xiaoqiang; Ai, Xuan; Qu, Shengguan; Li, Yuanyuan

doi:10.1016/j.msea.2015.04.026

Cited by 64 publications

(12 citation statements)

References 28 publications

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“…3, manifest four local failure modes, namely: W-W interparticle fracture (WW), W cleavage (WC), W-NiWFe interfacial debonding (WD), and NiWFe ductile phase rupture (DR). These local failure modes have been widely reported in previous studies of WHA[24,29,30,[33][34][35][37][38][39][40]. The WW interface is the weakest and, as expected, this fracture mode increases with increasing W[24,29,34,35,[37][38][39][40].…”

supporting

confidence: 79%

“…This damage is responsible for the lower RT ductility in the higher W WHAs. Most previous studies reported that more frequent WC microcracks increase tensile ductility [30,34]. However, WC decreases ductility at high W due to the linking of particle-sized microcracks to form a larger, unstably growing crack.…”

Section: Tensile Test Damage Developmentmentioning

confidence: 94%

“…1). The NiWFe DP honeycomb structure thickness (t) was measured using a line-intercept method (LIM), as the average width of the NiWFe phase measured on lines drawn on the binary image [30]. The NiWFe DP thickness/W length ratio was also calculated by the same LIM, by dividing the total intersected DP length by the total intersected W length.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

“…Indeed DPT has been successfully applied in many brittle matrix systems [20][21][22][23]. Tungsten heavy (metal) alloys (WHAs), or composites, typically containing 78-98 wt.% W, along with a balance of ductile phase metals like Ni, Fe, Cu, Co, have been studied for several decades [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. The WHAs are typically composed of W powders consolidated by liquid phase sintering (LPS).…”

Section: Introductionmentioning

confidence: 99%

“…WHAs generally have fairly good room to high-temperature tensile strength and ductility [28][29][30][31][34][35][36][39][40][41]. However, the key limiting structural property for W and W-alloys is usually fracture toughness and a high brittle to ductile transition temperature (BDTT) [3,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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On the remarkable fracture toughness of 90 to 97W-NiFe alloys revealing powerful new ductile phase toughening mechanisms

Alam

Odette

2020

Acta Materialia

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Tungsten is generally too brittle to serve a robust structural function. Here, we explore the fracture toughness of 90 to 97 wt.%W Fe-Ni liquid phase sintered tungsten heavy alloys (WHAs). The room temperature (RT) maximum load fracture toughness (KJm ≈ 69 to 107 MPa√m) of the WHA, containing only 3 to 10 wt.% of a Ni-Fe ductile phase (DP), is ≈ 9 to 13 times higher than KIc typical of monolithic W (≈ 8 MPa√m). All the WHAs show extensive stable crack growth, and increasing blunting line toughness averaging ≈ 170 MPa√m, prior to significant crack extension. In contrast to classical ductile phase toughening, that is primarily due to macrocrack bridging, the WHA toughness increase mainly involves new mechanisms associated with arrest, blunting and bridging of numerous dilatational shielding process zone microcracks in the macrocrack process zone. Tests down to-196°C, to partially emulate irradiation hardening, show decreasing toughness and a transition to elastic fracture at a temperature of-150°C for 90W to-25ºC for 97W. However, even at-196°C, the leanest DP 97W WHA KIc is ≈ 3 times that of monolithic W at RT. Possible effects of the small specimen size used in this study are briefly summarized.

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supporting

confidence: 79%

Section: Tensile Test Damage Developmentmentioning

confidence: 94%

Section: Microstructural Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the remarkable fracture toughness of 90 to 97W-NiFe alloys revealing powerful new ductile phase toughening mechanisms

Alam

Odette

2020

Acta Materialia

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Concurrent Hardening and Toughening of a Tungsten Heavy Alloy via a Novel Carburizing Cyclic Heat Treatment

Liu

et al. 2021

Adv Eng Mater

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Tungsten heavy alloys (WHAs), due to the combination of some attractive properties, are used in many engineering applications. Recently conducted researches are however focused on improving the surface properties of these alloys, such as their hardness, wear, and corrosion resistance, by applying different surface treatments. However, the obtained enhanced surface properties are concomitant with the maintenance or even deterioration of the mechanical properties, namely toughness, in the interior regions of these alloys. Herein, a novel carburizing cyclic heat treatment (CCHT)‐integrated technique is used to modify the microstructure of a 93W–4.9Ni–2.1Fe heavy alloy (93WHA). Other than investigating the effect of the applied process on the surface hardness and microstructure of this alloy, the influence of the conducted process on the microstructural and mechanical properties of the interior region of the processed parts is investigated. Due to the application of the CCHT process, the surface hardness of parts increases from 300 HV0.5, as observed in the nontreated samples, to the maximum value of 1049 HV0.5. In addition to the hardening effect observed on the surface of the treated samples, the interior regions of the CCHT‐modified parts are toughened.

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A Tungsten Heavy Alloy with Enhanced Performance Prepared by Spark Plasma Sintering from Fine Spherical Tungsten Powders

Han

Khanlari

et al. 2022

Adv Eng Mater

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Traditional tungsten heavy alloys (WHAs), with a coarse liquid‐phase sintered microstructure, have moderate strength and excellent ductility. Grain refinement is one of the effective methods to improve the strength of these WHAs. The routine spark plasma sintering (SPS) method can refine W grains; however, the obtained typical solid‐state sintered microstructure is detrimental to the performance. Adapted SPS methods such as cyclic SPS and transient liquid‐phase SPS, proposed in the previous study, are capable of modifying W grain morphology to further enhance the performance of parts. They are, however, complex processes, especially when it comes to mass production. In this research, 93W–5.6Ni–1.4Fe heavy alloys (93WHAs) with similar liquid‐phase sintered microstructure are prepared via SPS at solid‐state sintering temperature using fine spherical W powders as raw materials. The influences of the W powder shape and powder mixing condition on the microstructural and mechanical properties of the prepared 93WHAs are investigated. An improved microstructure is obtained in the 93WHA prepared using spherical W powders blended with nano Ni and Fe powders as raw materials, as compared to using the irregular W powders. The alloy thus shows elevated mechanical properties, due to the improved matrix phase distribution and the W grain morphology.

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Fabrication, characterization, and mechanical properties of 93W–4.9Ni–2.1Fe/95W–2.8Ni–1.2Fe–1Al2O3 heavy alloy composites

Cited by 64 publications

References 28 publications

On the remarkable fracture toughness of 90 to 97W-NiFe alloys revealing powerful new ductile phase toughening mechanisms

On the remarkable fracture toughness of 90 to 97W-NiFe alloys revealing powerful new ductile phase toughening mechanisms

Concurrent Hardening and Toughening of a Tungsten Heavy Alloy via a Novel Carburizing Cyclic Heat Treatment

A Tungsten Heavy Alloy with Enhanced Performance Prepared by Spark Plasma Sintering from Fine Spherical Tungsten Powders

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