Effect of texture and banded structure on the crack initiation mechanism of a friction stir welded magnesium alloy joint in very high cycle fatigue regime
Source abstract
Abstract
Abstract Friction stir welding (FSW) produces heterogeneous microstructure in nugget zone of its joint, which should affect the fatigue responses. This work revealed the unique texture and banded structure of the Mg-FSW joint and their decisive roles on crack initiation behaviors. At higher stress levels, failures occur along the AS NZ/TMAZ boundary (AS: advancing side, NZ: nugget zone, TMAZ: thermo-mechanically affected zone) due to the inhomogeneous deformations near the boundary. Severe plastic deformations concentrate in the softer layers of banded structure. However, at lower stress levels, plastic deformations become weak and localized, but accumulate in the alternate layers of banded structure simultaneously due to the same soft texture orientation, and induce random failures in banded structure. The failure mechanisms are verified by semi-quantitative mechanical models.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Welding Techniques Analysis · Aluminum Alloys Composites Properties · Magnesium Alloys: Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
Show source-provided references
1. Recent advances in friction-stir welding - process, weldment structure and properties10.1016/j.pmatsci.2008.05.001 ↗
2. Fatigue lifetime and tearing resistance of AA2198 Al-Cu-Li alloy friction stir welds: Effect of defects10.1016/j.ijfatigue.2014.07.001 ↗
3. Gap tolerance allowance and robotic operational window for friction stir butt welding of AA606110.1016/j.jmatprotec.2012.10.010 ↗
4. Effects of microstructural inhomogeneities and micro-defects on tensile and very high cycle fatigue behaviors of the friction stir welded ZK60 magnesium alloy joint10.1016/j.ijfatigue.2019.01.016 ↗
5. Effect of inclusion on subsurface crack initiation and gigacycle fatigue strength10.1016/S0142-1123(02)00037-3 ↗
6. Gigacycle fatigue of ferrous alloys10.1046/j.1460-2695.1999.t01-1-00185.x ↗
7. Diversity of damage evolution during cyclic loading at very high numbers of cycles10.1179/1743280411Y.0000000005 ↗
8. Texture variation and its influence on the tensile behavior of a friction-stir processed magnesium alloy10.1016/j.scriptamat.2006.02.019 ↗
9. Non-uniform deformation in a friction stir welded Mg-Al-Zn joint during stress fatigue10.1016/j.ijfatigue.2013.10.004 ↗
10. A study of texture patterns in friction stir welds10.1016/j.actamat.2007.11.016 ↗
11. Basal plane texture and flow pattern in friction stir weld of a magnesium alloy10.1007/s11661-003-0228-4 ↗
12. Enhanced very high cycle fatigue performance of extruded Mg-12Gd-3Y-0.5Zr magnesium alloy10.1016/j.msea.2010.12.092 ↗
13. Standard Practice for Heat Treatment of Magnesium Alloys, in: ASTM B661-12, American Society for Testing Material (ASTM) West Conshohocken, PA, 2012.
14. Bathias · 2004
15. Material flow in butt friction stir welds in AA2024-T310.1016/j.actamat.2005.10.052 ↗
16. Microstructure development during extrusion in a wrought Mg-Zn-Zr alloy10.1016/j.scriptamat.2008.12.006 ↗
17. The role of Zr-rich cores in strength differential effect in an extruded Mg-Zn-Zr alloy10.1016/j.jallcom.2009.06.123 ↗
18. Grain structure formation during friction stir welding observed by the 'stop action technique'10.1016/j.actamat.2005.03.044 ↗
19. Friction stir welding of as-extruded Mg-Al-Zn alloy with higher Al content Part I: Formation of banded and line structures10.1016/j.matchar.2014.08.002 ↗
20. Agnew · 2012
21. Relationship between grain size and Zener-Holloman parameter during friction stir processing in AZ31 Mg alloys10.1016/j.scriptamat.2004.05.043 ↗
22. High-strength extruded Mg-Al-Ca-Mn alloy10.1016/j.scriptamat.2011.04.026 ↗
23. Effect of microstructure inhomogeneity and crack initiation environment on the very high cycle fatigue behavior of a magnesium alloy10.1016/j.ijfatigue.2019.105376 ↗
24. Dynamic recrystallization of Mg and Mg-Y alloys: crystallographic texture development10.1016/j.msea.2007.08.016 ↗
25. Banded microstructure in 2024–T351 and 2524–T351 aluminum friction stir welds - Part II Mechanical characterization10.1016/S0921-5093(03)00533-1 ↗
26. Banded microstructure in AA2024-T351 and AA2524-T351 aluminum friction stir welds - Part I Metallurgical studies10.1016/S0921-5093(03)00532-X ↗
27. crack initiation and early propagation in an as-extruded Mg-10Gd-3Y-0.5Zr alloy in high cycle fatigue regime10.1016/j.msea.2018.10.015 ↗
28. Effect of microstructure on small fatigue crack initiation and early propagation behavior in Mg-10Gd-3Y-0.3Zr alloy10.1016/j.ijfatigue.2018.10.002 ↗
29. Cyclic slip irreversibility and fatigue life: A microstructure-based analysis10.1016/j.actamat.2012.10.029 ↗
30. K. Tanaka, T. Mura, A dislocation model for fatigue crack initiation, (1981).10.1115/1.3157599 ↗