Abstract
Friction stir processing modifies the micro structure and properties of metals through intense plastic deformation. The frictional heat input affects the microstructure evolution and resulting mechanical properties. 2 mm thick commercial AZ31B-H24 Mg alloy was friction stir processed under various process parameter combinations to investigate the effect of heat index on micro structure and properties. Recrystallized grain structure in the nugget region was observed for all processing conditions with decrease in hardness. Results indicate a reduced tensile yield strength and ultimate tensile strength compared to the as-received material in H-temper, but with an improved hardening capacity. The strain hardening behavior of friction stir processed material is discussed.
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References
W.M. Thomas, E.D. Nicholas, J.C. Needham, M.G. Murch, P. Templesmith, C. J. Dawes, G.B. Patent 9125978.8 (1991).
R.S. Mishra, M.W. Mahoney, S.X. McFadden, N.A. Mara, A.K. Mukherjee, Scr. Mater., 42 (1999) 163–168.
R.S. Mishra and Z.Y. Ma, “Friction stir welding and processing,” Mater. Sci. Eng. R.: Reports, 50 (2005) 1–78.
L. Cui et al., “Friction stir welding of a high carbon steel,” Scr. Mater., 56 (2007), 637–640.
C.I. Chang, X.H. Du, J.C. Huang, “Achieving ultrafine grain size in Mg-Al-Zn alloy by friction stir processing,” Scr. Mater., 57 (2007) 209–212.
C.I. Chang et al., “Producing nanograined micro structure in Mg-Al-Zn alloy by two-step friction stir processing,” Scr. Mater., 59 (2008), 356–359.
G. Bhargava et al., “Influence of texture on mechanical behavior of friction-stir-processed magnesium alloy,” Metall. Mater. Trans., 41 (2010) 13–17.
W. Yuan et al., “Effect of texture on the mechanical behavior of ultra-fine grained magnesium Alloy,” to be submitted to Scr. Mater..
W.J. Arbegast, P.J. Hartley, in: Proceedings of the Fifth International Conference of Trends in Welding Research, Pine Mountain, GA, June 1–5, 1998, p. 541.
J.A. Esparza et al., “Friction-stir welding of magnesium alloy AZ31B,” J. Mater. Sci. Lett., 21 (2002) 917–920.
S.H.C. Park, Y.S. Sato, H. Kokawa, “Microstructural evolution and its effect on Hall-Petch relationship in friction stir welding of thixomolded Mg alloy AZ91D,” J. Mater. Sci., 38 (2003) 4379–4383.
W.B. Lee, Y.M. Yeon, S.B. Jung, “Joint properties of friction stir welded AZ31B — H24 magnesium alloy,” Mater. Sci. Technol., 19 (2003) 785–790.
L. Commin et al., “Friction stir welding of AZ31 magnesium alloy rolled sheets: Influence of processing parameters,” Acta Mater., 57 (2009) 326–334.
J. Yang et al., “Effects of heat input on tensile properties and fracture behavior of friction stir welded Mg-3Al-1Zn alloy,” Mater. Sci. Eng. A, 527 (2010) 708–714.
C.I. Chang et al., “Relationship between grain size and Zener-Holloman parameter during friction stir processing in AZ31 Mg alloys,” Scr. Mater., 51 (2004), 509–514.
M.R. Barnett et al., “Influence of grain size on the compressive deformation of wrought Mg-3Al-1Zn”, Acta Mater., 52 (2004) 5093–5103.
J. Koike et al., “The activity of non-basal slip systems and dynamic recovery at room temperature in fine-grained AZ31B magnesium alloys,” Acta Mater., 51 (2003) 2055–2065.
S.R. Agnew and O. Duygulu, “Plastic anisotropy and the role of non-basal slip in magnesium alloy AZ31B,” Int. J. Plast., 21 (2005)1161–1193.
J. Luo et al., “Diminishing of work hardening in electroformed polycrystalline copper with nano-sized and uf-sized twins,” Mater. Sci. Eng. A, 441 (2006) 282–290.
N. Afrin et al., “Strain hardening behavior of a friction stir welded magnesium alloy,” Scr. Mater., 57 (2007) 1004–1007.
S.M. Chowdhury et al., “Tensile properties and strain-hardening behavior of double-sided arc welded and friction stir welded AZ31B magnesium alloy,” Mater. Sci. Eng. A, 527 (2010) 2951–2961.
U.F. Kocks and H. Mecking, “Physics and phenomenology of strain hardening: the FCC case,” Prog. Mater. Sci., 48 (2003) 171–273.
H.-W. Lee et al., “Studies on the improvement of tensile ductility of hot-extrusion AZ31 alloy by subsequent friction stir process,” J. Alloys Compd., 475 (2009) 139–144.
C.W. Sinclair et al., “A model for the grain size dependent work hardening of copper,” Scr. Mater., 55 (2006), 739–742.
I. Kovacs et al., “Grain size dependence of the work hardening process in A199.99,” Phys. Status Solidi A 194 (2002) 3–18.
J.A. del Valle et al., “Influence of texture and grain size on work hardening and ductility in magnesium-based alloys processed by ECAP and rolling,” Acta Mater., 54 (2006) 4247–4295.
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© 2011 TMS (The Minerals, Metals & Materials Society)
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Yuan, W., Mishra, R.S. (2011). Effect of Heat Index on Microstructure and Mechanical Behavior of Friction Stir Processed AZ31. In: Sillekens, W.H., Agnew, S.R., Neelameggham, N.R., Mathaudhu, S.N. (eds) Magnesium Technology 2011. Springer, Cham. https://doi.org/10.1007/978-3-319-48223-1_39
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DOI: https://doi.org/10.1007/978-3-319-48223-1_39
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48568-3
Online ISBN: 978-3-319-48223-1
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