Densification behavior of nanocrystalline W–Ni–Fe composite powders prepared by sol-spray drying and hydrogen reduction process

Fan, Jing; Gong, Xing; Huang, Baiyun; Song, Min; Liu, T.; Tian, Jia

doi:10.1016/j.jallcom.2009.09.050

Cited by 39 publications

(6 citation statements)

References 23 publications

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“…It can be seen that nearly spherical tungsten particles with an average grain size of ∼10 m are uniformly embedded in the ␥-(Ni, Fe) matrix phase for the as-sintered alloy. There are many second-phase particles containing yttrium locating at the surfaces of tungsten particles, playing crucial roles in the inhibition of grain growth and the absorbance of detrimental impurities during liquid-phase sintering [19], as shown in Fig. 3(a) and the inset.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and highly enhanced mechanical properties of fine-grained tungsten heavy alloy after one-pass rapid hot extrusion

Gong

Fan

Ding

et al. 2011

Materials Science and Engineering: A

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Section: Resultsmentioning

confidence: 99%

“…The detailed description about the preparation of the nanocrystalline composite powders can be found in our previous work [19]. The powders were pressed by means of cold isostatically pressing (CIP) to obtain cylindrical green compacts with a relative density of about 54%.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and highly enhanced mechanical properties of fine-grained tungsten heavy alloy after one-pass rapid hot extrusion

Gong

Fan

Ding

et al. 2011

Materials Science and Engineering: A

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“…Significant improvements in mechanical properties of WHAs are achieved by hot extrusion, hot isostatic extrusion, and cold deformation, forged and swaging of compacts prepared from ball milled powder or powder mixtures [87][88][89][90], but the last one indicates that the mechanical properties depend on the amount of deformation imparted during swaging. Rapid heat experiments of the order of seconds are performed on a 90W-7Ni-3Fe alloy, which is cold worked by rotary swaging to 50 and 82% reduction in diameter [90].…”

Section: High Energy Ballmentioning

confidence: 99%

Recent Progress in Processing of Tungsten Heavy Alloys

Şahin

2014

Journal of Powder Technology

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Tungsten heavy alloys (WHAs) belong to a group of two-phase composites, based on W-Ni-Cu and W-Ni-Fe alloys. Due to their combinations of high density, strength, and ductility, WHAs are used as radiation shields, vibration dampers, kinetic energy penetrators and heavy-duty electrical contacts. This paper presents recent progresses in processing, microstructure, and mechanical properties of WHAs. Various processing techniques for the fabrication of WHAs such as conventional powder metallurgy (PM), advent of powder injection molding (PIM), high-energy ball milling (MA), microwave sintering (MW), and spark-plasma sintering (SPS) are reviewed for alloys. This review reveals that key factors affecting the performance of WHAs are the microstructural factors such as tungsten and matrix composition, chemistry, shape, size and distributions of tungsten particles in matrix, and interface-bonding strength between the tungsten particle and matrix in addition to processing factors. SPS approach has a better performance than those of others, followed by extrusion process. Moreover, deformation behaviors of WHA penetrator and depleted uranium (DU) Ti alloy impacting at normal incidence both rigid and thick mild steel target are studied and modelled as elastic thermoviscoplastic. Height of the mushroomed region is smaller forα=0.3and it forms sooner in each penetrator as compared to that forα=0.2.

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“…In the military, tungsten alloy is often used at strong impact, high temperature, high corrosion occasions such as throat liner of solid rocket motor nozzle, inertial components, core of rod type kinetic energy projectile, etc [2]. At present, the research of tungsten alloy mainly focused on improving the mechanical properties by the addition of Co, Cr and other alloy elements [3], improving the tensile strength of tungsten alloy by microwave sintering [4], containing the growth of W grain by spark plasma sintering technology [5], producing wear-resistant and corrosion-resistant tungsten alloy material by spray deposition [6].…”

Section: Introductionmentioning

confidence: 99%

Performance of Tungsten Alloy Hardened by Electrospark

Jia-hui¹,

Li²,

Guo³

et al. 2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

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Abstract. The microstructure, hardness and corrosion resistance of the tungsten alloy hardened layer, which was hardened by different power of electrospark, were investigated. The results show that the matrix and the electrode of the tungsten alloy were melted into each other after hardened by electrospark. The hardness and corrosion resistance of the hardened layer were significantly improved, and had a significant correlation with the power of the electrospark. The hardness of the hardened layer under 1600W is the largest, which improved 35.3% than the matrix. The corrosion current density of 2000W is the smallest, which is about 0.17 A/cm 2 , and is decreased by almost two orders of magnitude than the matrix material. A dense oxide film was formed on the surface of the hardened layer in the case of the electrospark power of 2000W.

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Densification behavior of nanocrystalline W–Ni–Fe composite powders prepared by sol-spray drying and hydrogen reduction process

Cited by 39 publications

References 23 publications

Microstructure and highly enhanced mechanical properties of fine-grained tungsten heavy alloy after one-pass rapid hot extrusion

Microstructure and highly enhanced mechanical properties of fine-grained tungsten heavy alloy after one-pass rapid hot extrusion

Recent Progress in Processing of Tungsten Heavy Alloys

Performance of Tungsten Alloy Hardened by Electrospark

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