Sintered tungsten heavy alloys: Review of microstructure, strength, densification, and distortion
Source abstract
Abstract
Tungsten heavy alloys are fabricated using liquid phase sintering to form inertial, electrical, radiation, or structural components. The compositions, initially developed a century ago, are based on various W-Ni-(Fe/Cu/Co/Mo) alloys. Two classes, and W-Ni-Fe and W-Ni-Cu, remain the most popular. Nickel is key to sintering densification, producing the majority of sintering shrinkage prior to liquid formation. Sintering densification and distortion depend on the gravitational environment. Normal gravity induces distortion after densification, while sintering in microgravity fails to reach full density yet distorts. Mechanical properties are adjustable via changes to the composition, sintering cycle, or post-sintering treatment. Increased strength, with a loss of ductility, comes with post-sintering deformation and aging treatments. As shown here, a range of mechanical property combinations are possible. Processing options designed to improve strength invariably result in a loss of ductility, and vice versa. Peak property combinations are attainable over a broad tungsten content range, reflecting convergence to a self-similar microstructure.
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References (67)
Show source-provided references
1. German · 2021
2. Tungsten heavy alloys: an exploration of how key property combinations enable better mechanical performance
3. Lenel · 1980
4. Review: liquid phase sintering10.1007/s10853-008-3008-0 ↗
5. Experimental method for determining transport paths in liquid phase sintering
6. Solubility of nickel in tungsten
7. Initiation of directional grain growth during liquid-phase sintering of tungsten and nickel10.1179/pom.1981.24.1.7 ↗
8. Chemically induced migration of liquid film in W-Ni-Fe alloy10.1016/0001-6160(85)90012-4 ↗
9. Closure of isolated pores in liquid phase sintering of W-Ni
10. Microstructural anomalies in a W-Ni alloy liquid phase sintered under microgravity conditions. Metallurgical and materials
11. A phenomenological analysis of sintering mechanisms of W-cu from the effect of copper content on densification kinetics10.1007/s11661-011-0615-1 ↗
12. German · 2014
13. German · 1996 · 213
14. Microstructural evolution of a 93 Wt % tungsten heavy alloy: a quenching study to understand the evolution of contiguity, connectivity with sintering temperature and time
15. Control of distortion during liquid phase sintering
16. Effect of gravity on three-dimensional coordination number distribution in liquid phase sintered microstructures10.1016/S1359-6454(99)00164-0 ↗
17. The two-dimensional connectivity of liquid phase sintered microstructures10.1007/BF02646932 ↗
18. Microstructure of the gravitationally settled region in a liquid phase sintered dilute tungsten heavy alloy10.1007/BF02664666 ↗
19. Microstructure analysis of samples sintered at different gravitational conditions10.1007/s10853-010-4528-y ↗
20. Microstructural parameters related to liquid phase sintering10.1007/s11661-000-0205-0 ↗
21. German · 1985
22. Microstructure quantification procedures in liquid-phase sintered materials10.1016/S1359-6454(98)00395-4 ↗
23. Quantitative microstructure analysis of tungsten heavy alloys (W-Ni-cu) during initial stage liquid phase sintering10.1016/j.ijrmhm.2004.10.004 ↗
24. Sintering time and atmosphere influences on the microstructure and mechanical properties of tungsten heavy alloys10.1007/BF02660866 ↗
25. Experimental investigation of particle size distribution influence on diffusion controlled coarsening10.1016/0956-7151(93)90372-Y ↗
26. The effect of contiguity on growth kinetics in liquid phase sintering
27. Modeling grain growth dependence on the liquid content in liquid-phase sintered materials10.1007/s11661-998-0213-z ↗
28. Grain size evolution and grain size distribution in sintered materials
29. Heavy metal alloys containing 30% to 90% tungsten
30. Sintered heavy alloys - a review
31. Effect of tungsten composition on the mechanical properties on the W-Ni-Fe heavy alloy
32. Microstructure effects on tensile properties of tungsten-nickel-Iron composites
33. Gravitational effects on microstructures in liquid phase sintering. advances in powder metallurgy and particulate materials - 2007
34. A quantitative model for the effects of gravity on the mechanical behaviour of tungsten heavy alloys
35. The effect of hot rolling on the strength and fracture toughness of 90W-7Ni-3Fe tungsten heavy metal alloys
36. A comparative study on tool life and wear of uncoated and coated cutting tools in turning of tungsten heavy alloys
37. Effect of Ni/Fe ratio on microstructure, tensile flow, and work hardening behaviour of tungsten heavy alloys in heat treated and swaged conditions10.1080/14786435.2020.1831704 ↗
38. Effect of ZrB2 addition on the microstructure evolution and mechanical properties of 93 wt % tungsten heavy alloys
39. Microstructure, distortion characteristics, and mechanical behaviour of NiB modified 90W-6Ni-4Co heavy alloy10.1016/j.jallcom.2021.161404 ↗
40. Refractory metal alloying: a new method for improving mechanical properties of tungsten heavy alloys10.1016/j.jallcom.2017.03.174 ↗
41. High entropy alloy: a promising matrix for high-performance tungsten heavy alloys10.1016/j.jallcom.2018.11.089 ↗
42. Effect of HfC addition on the microstructure and properties of W-4.9Ni-2.1Fe heavy alloys10.1016/j.jallcom.2021.159683 ↗
43. Development of ODS tungsten heavy alloys reinforced with Co9Al8W superalloy binder by mechanical alloying10.1016/j.jallcom.2022.163762 ↗
44. Fabrication and characterization of tungsten heavy alloys with high W content by powder metallurgy10.1007/s11661-021-06579-w ↗
45. Effect of tungsten content and compression on microstructure and texture evolution in liquid phase sintered heavy alloy
46. High susceptibility to adiabatic shear banding and high dynamic strength in tungsten heavy alloys with a high entropy alloy matrix10.1016/j.jallcom.2020.157796 ↗
47. Stress-strain distribution within swaged tungsten heavy alloy
48. Comparative studies of the constitutive models for tungsten heavy alloy (95W-3.5Ni-1.5Fe) at high strain rates
49. Effect of dissolved tungsten on the deformation of 70Ni-30Fe alloys10.1007/s11661-004-0229-y ↗
50. Concurrent hardening and toughening of a tungsten heavy alloy via a novel carburizing cyclic heat treatment10.1002/adem.202001283 ↗
51. Structural transition and ductility enhancement of a tungsten heavy alloy under high pressure10.1016/j.ijrmhm.2021.105632 ↗
52. Microstructure and mechanical properties of novel tungsten heavy alloys prepared using FeNiCoCrCu HEA as binder
53. A review on alloying in tungsten heavy alloys, materials processing and interfaces
54. German · 2011
55. German · 2005
56. On the remarkable fracture toughness of 90 to 97 W - NiFe alloys revealing powerful new ductile phase toughening mechanisms10.1016/j.actamat.2020.01.012 ↗
57. Characteristics of liquid phase sintered tungsten heavy alloys
58. Rheological model for viscous flow densification during Supersolidus liquid phase sintering10.2298/SOS0601027G ↗
59. Supersolidus liquid-phase sintering of Prealloyed powders10.1007/s11661-997-0217-0 ↗
60. Modelling of Anisotropic Shrinkage during Liquid Phase Sintering
61. Strength loss and distortion in liquid phase sintering
62. Application of three-dimensional digital image process for reconstruction of microstructural volume from serial sections10.1016/S1044-5803(99)00004-2 ↗
63. Modeling of distortion after densification during liquid phase sintering
64. Strength loss and distortion in liquid phase sintering
65. Heating rate effects on microstructural properties of liquid phase sintered tungsten heavy alloys10.1016/j.ijrmhm.2004.01.006 ↗
66. Distortion simulation of liquid phase sintering on earth, on the moon, on mars, and in space
67. Pope. in situ resource-based lunar and Martian habitat structures development at NASA/MSFC