Characterization of fine-grained W–10wt.% Cu composite fabricated by hot-shock consolidation

Zhou, Qiang; Chen, Pengwan

doi:10.1016/j.ijrmhm.2015.06.002

Cited by 26 publications

(6 citation statements)

References 32 publications

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“…Figures 10(a), (b) shows that W-Cu-Cr-ZrC composite has higher nanoindentation hardness (10.7±1.24 GPa) than that (8.23±0.95 GPa) of W-Cu composite prepared in this work. The value is much higher than that of the W-10 wt%Cu composite (5.94 GPa), as reported in the literature [44]. The nanoindentation elastic modulus, obtained in figures 10(c), (d), are at the same level for W-Cu-Cr-ZrC (298±11.5 GPa) and W-Cu (294.8±13.6 GPa) composites.…”

Section: Hardness and Comparisonsupporting

confidence: 64%

Novel nanocrystalline W–Cu–Cr–ZrC composite with ultra-high hardness

Cao

Hou

et al. 2020

Nanotechnology

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Phase separation at nanoscale and highly dispersive nanoparticles were exploited to fabricate a novel type of nanocrystalline W–Cu–Cr–ZrC composite with special hierarchical structure. The microstructures were characterized elaborately and the formation mechanisms of the hierarchical structure were disclosed. It was found that the supersaturated Cr separated from W during sintering and segregated at profuse interfaces. Moreover, Cr can also interact with ZrC nanoparticles dispersed in W matrix, leading to the formation of Zr–Cr–C phase which exerts significant effect on inhibiting coarsening of W grains. On the other side, the dissolution of Cr and W contributes to the formation of Cu nanocrystalline structure. As a result, the prepared W–Cu–Cr–ZrC composite exhibits an ultrahigh hardness of 943HV owing to the synergy of nanocrystalline structure and dispersion strengthening of nanoparticles. The hardness has achieved the highest value among the W–Cu-based composites with the same Cu content reported in literature. This study provided a new strategy for production of high-performance W–Cu-based composites through combination of microstructural design with addition of doping element and nanoparticles.

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Section: Hardness and Comparisonsupporting

confidence: 64%

Novel nanocrystalline W–Cu–Cr–ZrC composite with ultra-high hardness

Cao

Hou

et al. 2020

Nanotechnology

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“…Such a highly textured dendrite microstructure of micron-size-W rich dendrites may provide a greater freedom of expansion and contraction (plasticity) when exposed to high thermal loads, suggesting them as the potential candidates for high temperature coatings. On the contrary, the utilization of mechanically alloyed commercial powders for shock wave consolidation has not allowed for the achievement of dense samples (<95%) [ 25 ]. High-velocity wave propagation extrudes copper from the adjacent areas of W particles; they instantaneously impact each other and aggregate, creating both pores and the inhomogeneous distribution of constituents.…”

Section: The Role Of Coupling On the Synthesis And Sintering Of Shs Powdersmentioning

confidence: 99%

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

2021

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The capability of self-propagating high-temperature synthesis (SHS) to produce powders that are characterized by a high sintering ability, owing to high heating and cooling rates inherent to the exothermic reaction, is of a special interest for the industry. In particular, SHS-derived powders comprise a significant defect concentration in order to effectively enhance the mass transfer processes during the sintering, which allows for the successful consolidation of difficult-to-sinter materials at relatively low sintering temperatures. From this perspective, the design of precursors suitable for sintering, synthesis in a controlled temperature regime and the optimization of geometrical and structural parameters of SHS powders as a potential feedstock for the consolidation is of key importance. Here, we report on the comparative studies concerning the SHS processing of composites for advanced powder metallurgy techniques. The synthesis and sintering peculiarities of the SHS through coupled reactions in the Me’O3(WO3,MoO3)-Me’’O(CuO,NiO)-Mg-C, Ti-B-Al12Mg17 systems are comparatively reviewed. The SHS coupling approach was used for the preparation of powders with a tuned degree of fineness (a high specific surface area of particles), a high-homogeneity and a controllable distribution of elements via both the regulation of the thermal regime of combustion in a wide range and the matching of the thermal and kinetic requirements of two interconnected reactions. Microstructural features of the powder feedstock greatly contributed to the subsequent consolidation process.

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“…Therefore, Boji et al used Ni and Co as sintering activators to decrease the sintering temperature of the W skeleton by 750 and 560 °C, respectively, and successfully prepared W–10Cu composite by infiltration [ 7 ]. Zhou et al fabricated W–10Cu composite with high relative density via hot-shock consolidation under a relatively low sintering temperature (less than 1000 °C) and a short sintering time (less than 3 min) without any sintering activator [ 16 ]. Liu et al proposed a process to produce W–10Cu composite by liquid phase sintering using nano-sized W–Cu powder with high sintering activity [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

W–Cu Composite with High W Content Prepared by Grading Rounded W Powder with Narrow Particle Size Distribution

Chen

Zhang

et al. 2022

Materials

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In this study, the W (10–20%)–Cu composites were simultaneously fabricated using commercial, graded commercial, and graded jet-milled W powder. The results show that the W–Cu composites prepared with the graded jet-milled W powders have the highest density and best comprehensive performance due to the combined effect of the particle gradation and jet-milling treatment. Particle gradation is employed to increase the packing density of powders, thereby increasing the relative density of the compressed W skeleton, and the rounded powder with narrow particle size distribution after jet-milling treatment is used to reduce the enclosed pores formed during the process of compacting and infiltration. W–Cu composites with a high density of 16.25 g/cm3 can be directly obtained by conventional compacting at a low pressure of 300 MPa and following infiltration.

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Characterization of fine-grained W–10wt.% Cu composite fabricated by hot-shock consolidation

Cited by 26 publications

References 32 publications

Novel nanocrystalline W–Cu–Cr–ZrC composite with ultra-high hardness

Novel nanocrystalline W–Cu–Cr–ZrC composite with ultra-high hardness

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

W–Cu Composite with High W Content Prepared by Grading Rounded W Powder with Narrow Particle Size Distribution

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