Cyclic softening in annealed Zircaloy-2: Role of edge dislocation dipoles and vacancies
Source abstract
Abstract
Abstract The mechanism of cyclic softening in annealed Zircaloy-2 at low strain amplitudes under strain controlled fatigue at room temperature is rationalized. The unusual softening due to continuous decrease in the phenomenological friction stress is found to be associated with decrease in the resistance against movement of dislocations because of the formation and easy glide of pure edge dislocation dipoles and consequent decrease in friction stress from reduction in the shear modulus. Positron annihilation spectroscopy data strongly support the increase in edge dislocation density containing jogs, from increased positron trapping and increase in annihilation lifetime.
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Research context
OpenAlex topics: Muon and positron interactions and applications · Advanced ceramic materials synthesis · Microstructure and mechanical properties
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References (28)
Show source-provided references
1. The cyclic stress-strain behaviour of age-hardened CuCo and AlZnMg alloy single crystals10.1016/0025-5416(81)90069-0 ↗
2. Cyclic stress-strain behaviour of austenitic Fe-29.7Mn-8.7A1-1.04C alloy at room temperature10.1016/0025-5416(87)90333-8 ↗
3. Fatigue softening and hardening of annealed low carbon steel
4. The cyclic stress-strain response of titanium-vanadium alloys10.1016/0001-6160(78)90042-1 ↗
5. Cyclic softening and thermally activated deformation of titanium and zirconium10.1016/0025-5416(83)90190-8 ↗
6. Cyclic hardening and softening behavior of a fully annealed Zircaloy-410.1016/0956-716X(94)90059-0 ↗
7. Cyclic softening mechanisms of Zircaloy-410.1016/j.jnucmat.2004.01.004 ↗
8. Cyclic softening mechanisms of Zry-4 at room temperature: the unlikely influence of texture variations10.1016/j.scriptamat.2004.05.017 ↗
9. Low cycle fatigue behavior of Zircaloy-2 at room temperature10.1016/j.jnucmat.2013.05.068 ↗
10. Cyclic deformation behaviour and microstructure of commercial-purity zirconium10.1016/0142-1123(94)90456-1 ↗
11. Low cycle fatigue properties and microscopic deformation structure of Zircaloy-4 in recrystallized and stress-relieved conditions10.1016/S0022-3115(98)00506-6 ↗
12. Cyclic softening in alpha-titanium10.1016/0036-9748(72)90053-1 ↗
13. Cyclic deformation of commercial-purity titanium10.1016/0001-6160(75)90151-0 ↗
14. Vacancies and carbon impurities in α-iron: electron irradiation10.1103/PhysRevB.25.762 ↗
15. 1979 · 90
16. Disappearance and reappearance of serrated plastic flow under cyclic loading: a study of dislocation substructures10.1016/j.msea.2014.02.064 ↗
17. Monographs in practical electron microscopy in material science
18. Formation of subsurface zone induced by sliding wear in zirconium studied by positron lifetime spectroscopy
19. Positron lifetime calculation for the elements of the periodic table10.1088/0953-8984/19/17/176222 ↗
20. Cyclic behavior and delayed softening of commercial purity titanium10.1007/BF02656399 ↗
21. The cyclic deformation of titanium: dislocation substructures and effective and internal stresses
22. Hull · 1984 · 56
23. The interactions between dislocations and dislocation dipoles
24. Voids in fatigued copper single crystals10.1002/pssa.2210670248 ↗
25. Dislocations in Cd studied by positron annihilation spectroscopy10.1088/0305-4608/18/11/004 ↗
26. Edge dislocations in fcc metals: microscopic calculations of core structure and positron states in Al and Cu10.1103/PhysRevB.41.12441 ↗
27. Positron trapping at dislocations in metals10.1016/0038-1098(77)91308-4 ↗
28. Influence of dislocations on positron lifetime in iron10.1143/JPSJ.66.3090 ↗