Crack self-healing by high-temperature annealing of a 90W7Ni3Fe tungsten heavy alloy
Source abstract
Abstract
WNiFe tungsten heavy alloys (WHAs) are leading candidates for fusion plasma-facing components, since they are toughened by embedding brittle W-particles in a ductile phase honeycomb matrix. We show that fatigue cracks in a 90W7Ni3Fe WHA, up to ≈ 1.3 mm long, are completely healed by vacuum annealing at 1300 °C for 24 h, as confirmed by microstructural observations and locating the healed crack initiation site, by both re-loading and re-precracking. Annealing also improves WHA toughness. Healing is not due to previously postulated mechanisms. We hypothesize that it derives from internal annealing stresses that extrude the ductile phase into adjacent cracks.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fusion materials and technologies · Advanced materials and composites · Nuclear Materials and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (34)
Show source-provided references
1. Recent progress in research on tungsten materials for nuclear fusion applications in Europe10.1016/j.jnucmat.2012.08.018 ↗
2. Tungsten as material for plasma-facing components in fusion devices10.1016/j.jnucmat.2011.01.110 ↗
3. Qualification of W heavy alloys as plasma facing material
4. Fracture-mechanical properties of neutron irradiated ITER specification tungsten10.1016/j.jnucmat.2020.152761 ↗
5. Ductilisation of tungsten (W): On the shift of the brittle-to-ductile transition (BDT) to lower temperatures through cold rolling10.1016/j.ijrmhm.2015.09.001 ↗
6. Fracture toughness of polycrystalline tungsten alloys10.1016/j.ijrmhm.2010.04.007 ↗
7. Results on the use of tungsten heavy alloys in the divertor of ASDEX Upgrade10.1016/j.jnucmat.2018.05.066 ↗
8. Investigations on tungsten heavy alloys for use as plasma facing material10.1016/j.fusengdes.2017.01.043 ↗
9. On the remarkable fracture toughness of 90 to 97W-NiFe alloys revealing powerful new ductile phase toughening mechanisms10.1016/j.actamat.2020.01.012 ↗
10. The effect of hot rolling on the strength and fracture toughness of 90W–7Ni3Fe tungsten heavy metal alloys10.1016/j.msea.2021.141738 ↗
11. On the Influence of Specimen Size and Geometry on the Fracture Toughness of Tungsten Heavy Metal Alloys10.1016/j.jnucmat.2022.154025 ↗
12. Improving the Fracture Toughness and Ductility of Liquid Phase Sintered WNiFe Tungsten Heavy Alloys by High-Temperature Annealing10.3390/ma16030916 ↗
13. Neutron activation and radiation damage assessment for W-Ni-Fe tungsten heavy alloys with variable Ni content
14. B. Grabowski, C.C. Tasan, Self-healing metals, in: M. Hager, S. van der Zwaag, U. Schubert (Eds.), Self-Healing Mater. Adv. Polym. Sci. Vol 273., Springer, Cham, 2016: pp. 387–407.10.1007/12_2015_337 ↗
15. Crack healing in a steel by using electropulsing technique10.1016/j.matlet.2003.10.049 ↗
16. On a new Ti-carbooxinitride redistribution driven microcrack healing mechanism in an annealed 14YWT nanostuctured ferritic alloy10.1016/j.actamat.2021.116842 ↗
17. High-temperature shape memory alloys Some recent developments10.1016/j.msea.2003.10.324 ↗
18. Repairing large cracks and reversing fatigue damage in structural metals10.1016/j.apmt.2018.07.003 ↗
19. Self-healing metals and metal matrix composites10.1007/s11837-014-0912-4 ↗
20. Self-healing of damage inside metals triggered by electropulsing stimuli
21. In situ TEM observation of crack healing in α-Fe10.1016/S1359-6462(01)00671-6 ↗
22. Evolution Behaviors and Mechanisms of Internal Crack Healing in Steels at Elevated Temperatures10.1007/s11661-018-4814-x ↗
23. Improved creep strength and creep ductility of type 347 austenitic stainless steel through the self-healing effect of boron for creep cavitation10.1007/s11661-005-0311-0 ↗
24. Self healing of creep damage through autonomous boron segregation and boron nitride precipitation during high temperature use of austenitic stainless steels
25. Precipitation induced densification in a sintered Al-Zn-Mg-Cu alloy10.1016/j.scriptamat.2006.04.021 ↗
26. Healing of Nanocracks by Disclinations10.1103/PhysRevLett.111.145501 ↗
27. Autonomous healing of fatigue cracks via cold welding10.1038/s41586-023-06223-0 ↗
28. On the effect of high-temperature annealing on the microstructure and mechanical properties of a hot-rolled 90W7Ni3Fe tungsten heavy alloy10.1016/j.msea.2024.146200 ↗
29. Standard Test Method for Determination of Reference Temperature, To, for Ferritic Steels in the Transition Range
30. Anderson · 2005
31. Porter · 2009
32. Thermal expansion coefficient of Fe-Ni (fcc) alloys, Science reports of the Research Institutes, Tohoku University, Ser
33. Thermal expansion of tungsten in the range 1500–3600 K by a transient interferometric technique10.1007/BF01184332 ↗
34. Study on High-Temperature Mechanical Properties of Fe–Mn–C–Al TWIP/TRIP Steel10.3390/met11050821 ↗