Journal ArticleDOI
On structure property correlation in high strength tungsten heavy alloys
TLDR
In this paper, a detailed structure-property correlation has been carried out in high strength tungsten heavy alloys with liquid phase sintering followed by large deformation during thermo mechanical processing and studied for microstructure and mechanical properties.Abstract:
Detailed structure-property correlation has been carried out in high strength tungsten heavy alloys. Alloys of compositions 90W-6Ni-2Fe-2Co, 89W-6Ni-2Fe-3Co, 89.5W-6Ni-2Fe-2Co-0.5Mo, 89.75W-6Ni-2Fe-2Co-0.25Mo, 90W-6Ni-1.5Fe-2.5Co and 90W-6Ni-1Fe-3Co have been prepared by liquid phase sintering followed by large deformation during thermo mechanical processing and studied for microstructure and mechanical properties. Despite differences in composition, higher volume fraction of matrix and lower W-W contiguity in the microstructure result in superior tensile strength and impact toughness. Increasing W content in the matrix enhances mechanical properties by imparting solid solution strengthening, increasing the matrix volume fraction and reducing W-W contiguity. The alloy 90W-6Ni-1Fe-3Co shows superior balance of properties with ultimate tensile strength of 1600 MPa and average impact toughness of 121 J/cm2.read more
Citations
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Achieving high strength and ductility in ODS-W alloy by employing oxide@W core-shell nanopowder as precursor.
TL;DR: In this paper, a unique in-house synthesized oxide@W core-shell nanopowder was used as a precursor to prepare W-based oxide dispersion strengthened (ODS) alloy, which achieved a great enhancement of strength and ductility at room temperature.
Journal ArticleDOI
Effect of thermomechanical processing via rotary swaging on properties and residual stress within tungsten heavy alloy
Lenka Kunčická,Adéla Macháčková,Nicholas Lavery,Radim Kocich,Jonathan C.T. Cullen,Libor M. Hlaváč +5 more
TL;DR: In this paper, the effects of cold and warm rotary swaging and subsequent post-process annealing on mechanical properties, residual stress, and structure development within WNiCo powder-based pseudo-alloy were predicted numerically and investigated experimentally.
Journal ArticleDOI
Effect of composition, heat treatment and deformation on mechanical properties of tungsten heavy alloys
Ashutosh Panchal,T.K. Nandy +1 more
TL;DR: In this paper, five different compositions of tungsten heavy alloy with Ni, Fe, Co and Mo were prepared through powder metallurgy route using liquid phase sintering Three alloys were based on quaternary W-Ni-Fe-Co, with varying Ni to Fe ratio and Co content.
Journal ArticleDOI
High entropy alloy: A promising matrix for high-performance tungsten heavy alloys
Shangcheng Zhou,Yao-Jian Liang,Yichao Zhu,Ruizhi Jian,Benpeng Wang,Yunfei Xue,Lu Wang,Fuchi Wang +7 more
TL;DR: In this article, a novel tungsten heavy alloys (WHAs) was designed that selects an AlCrFeNiV-system high entropy alloy (HEA) as matrix based on its wetting behavior on polycrystalline W. The wetting experiments show that this W/HEA system exhibits low contact angles at the temperatures for liquid phase sintering (LPS), and dissolutive wetting with a moderate W solubility in the HEA.
Journal ArticleDOI
Characterization of ductile phase toughening mechanisms in a hot-rolled tungsten heavy alloy
James V. Haag,Danny J. Edwards,Charles H. Henager,Wahyu Setyawan,Jing Wang,Mitsuhiro Murayama,Mitsuhiro Murayama +6 more
TL;DR: In this article, a 90W-7Ni-3Fe Alloy was used to investigate the effect of thermomechanical treatment and microstructural manipulation on the overall effectiveness of deformation accommodation in these bi-phase metallic composites.
References
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Journal ArticleDOI
Microstructure and mechanical properties of super-strong nanocrystalline tungsten processed by high-pressure torsion
Qiuming Wei,H. Zhang,Brian E. Schuster,Brian E. Schuster,K.T. Ramesh,Ruslan Z. Valiev,Laszlo J. Kecskes,Robert J. Dowding,L. S. Magness,Kyu Cho +9 more
TL;DR: In this article, the nanocrystalline tungsten (nc-W) was obtained by high-pressure torsion (HPT) at low temperature (500°C) by transmission electron microscopy (TEM).
Journal ArticleDOI
Combination of mechanical alloying and two-stage sintering of a 93W /5.6Ni /1.4Fe tungsten heavy alloy
Soon Hyung Hong,Ho Jin Ryu +1 more
TL;DR: The microstructural evolution and mechanical properties of a mechanically alloyed and two-stage sintered tungsten heavy alloy were investigated in this paper, where the micro-structural parameters such as particle size, matrix volume fraction, and tengsten/tungsten contiguity were controllable through the two stage sintering process.
Journal ArticleDOI
Fracture Behavior of W-Ni-Fe Heavy Alloys
K. S. Churn,Randall M. German +1 more
TL;DR: In this article, heavy alloys were liquid phase sintered from compacts of mixed W, Ni, and Fe powders, with the alloy compositions ranged from 93 to 97 wt pct W with the Ni:Fe ratio maintained at 7:3.
Journal ArticleDOI
Microstructure effects on tensile properties of tungsten-Nickel-Iron composites
B. H. Rabin,Randall M. German +1 more
TL;DR: In this article, deformation and fracture behavior of heavy alloys containing 88 to 97 pct W were studied via slow strain rate tensile testing at room temperature, where the tradeoff between strength and ductility resulted in a maximum in the ultimate tensile strength at 93 pct w.r.t.