Abstract
The plastic deformation behavior of aluminum casting alloys A356 and A357 has been investigated at various solidification rates with or without Sr modification using monotonic tensile and multi-loop tensile and compression testing. The results indicate that at low plastic strains, the eutectic particle aspect ratio and matrix strength dominate the work hardening, while at large plastic strains, the hardening rate depends on secondary dendrite arm spacing (SDAS). For the alloys studied, the average internal stresses increase very rapidly at small plastic strains and gradually saturate at large plastic strains. Elongated eutectic particles, small SDAS, or high matrix strength result in a high saturation value. The difference in the internal stresses, due to different microstructural features, determines the rate of eutectic particle cracking and, in turn, the tensile instability of the alloys. The higher the internal stresses, the higher the damage rate of particle cracking and then the lower the Young’s modulus. The fracture strain of alloys A356/357 corresponds to the critical amount of damage by particle cracking locally or globally, irrespective of the fineness of the microstructure. In the coarse structure (large SDAS), this critical amount of damage is easily reached, due to the clusters of large and elongated particles, leading to alloy fracture before global necking. However, in the alloy with the small SDAS, the critical amount of damage is postponed until global necking takes place due to the small and round particles. Current models for dispersion hardening can be used to calculate the stresses induced in the particles. The calculations agree well with the results inferred from the experimental results.
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G.A. Edwards, K. Stiller, G.L. Dunlop, and M.J. Couper: Mater. Sci. Forum, 1996, vols. 217–222, pp. 713–18.
Q.G. Wang and C.H. Cáceres: Mater. Sci. Eng., 1998, vol. A241, pp. 72–78.
S.F. Frederick and W.A. Bailey: Trans. TMS-AIME, 1968, vol. 242, p. 2063.
A. Gangulee and J. Gurland: Trans. TMS-AIME, 1967, vol. 239, pp. 269–72.
C.W. Meyers, A. Saigal, and J.T. Berry: AFS Trans., 1983, vol. 91, pp. 281–88.
C.H. Cáceres, C.J. Davidson, and J.R. Griffiths: Mater. Sci. Eng. A, 1995, vol. 197, pp. 171–79.
C.H. Cáceres, J.R. Griffiths, and P. Reiner: Acta Mater., 1996, vol. 44, pp. 15–23.
C.H. Cáceres and J.R. Griffiths: Acta Mater., 1996, vol. 44, pp. 25–33.
Q.G. Wang, C.H. Cáceres, and J.R. Griffiths: AFS Trans., 1998, vol. 106, pp. 131–36.
C.H. Cáceres, C.J. Davidson, J.R. Griffiths, and Q.G. Wang: Metall. Mater. Trans. A, 1999, vol. 30A, pp. 2611–18.
Q.G. Wang, C.H. Cáceres, and J.R. Griffiths: Metall. Mater. Trans. A, 2003, vol. 34A, pp. 2901–12.
Q.G. Wang: Metall. Mater. Trans. A, 2003, vol. 34A, pp. 2887–99.
C. Verdu, H. Cercueil, S. Communal, P. Sainfort, and R. Fougeres: Mater. Sci. Forum, 1996, vols. 217–222, pp. 1449–54.
L.M. Brown and W.M. Stobbs: Phil. Mag., 1971, vol. 23, pp. 1185–99.
L.M. Brown and W.M. Stobbs: Phil. Mag., 1971, vol. 23, pp. 1201–33.
Q.G. Wang and C.H. Cáceres: Mater. Sci. Eng. A, 1997, vols. A234–A236, pp. 106–09.
J.D. Embury: Metall. Trans. A, 1985, vol. 16A, pp. 2191–200.
G.D. Moan and J.D. Embury: Acta Metall., 1979, vol. 27, p. 903.
R. Sowerby, D.K. Uko, and Y. Tomita: Mater. Sci. Eng. A, 1979, vol. 41, pp. 43–58.
J.D. Embury: Mater. Forum, 1987, vol. 10(1), pp. 27–32.
M.F. Ashby: Strengthening Methods in Crystals, A. Kelly and R.B. Nicholson, eds., Elsevier, Amsterdam, 1971, pp. 137–92.
L.M. Brown and D.R. Clarke: Acta Metall., 1975, vol. 23, pp. 821–30.
L.M. Brown: Acta Metall., 1973, vol. 21, pp. 879–85.
Y. Brechet, J.D. Embury, S. Tao, and L. Luo: Acta Metall. Mater., 1991, vol. 39, pp. 1781–86.
N. Hansen: Acta Metall., 1977, vol. 25, pp. 863–69.
R.W. Coade, J.R. Griffiths, B.A. Parker, and P.J. Stevens: Phil. Mag., 1981, vol. A44 (2), pp. 357–72.
R.S. Chappell, T.A. Hughes, and G. Pollard: Metallography, 1970, vol. 3, pp. 235–37.
P.N. Crepeau: AFS Trans., 1996, vol. 103, pp. 361–66.
S.F. Corbin and D.S. Wilkinson: Acta Metall. Mater., 1994, vol. 42 (4), pp. 1311–18.
C.H. Cáceres: Aluminum Trans., 1999, vol. 1 (1), pp. 1–13.
Q.G. Wang and C.J. Davidson: J. Mater. Sci., 2001, vol. 36, pp. 739–50.
J.A. Taylor, D.H. St John, J. Barresi, and M.J. Couper: Mater. Sci. Forum, 2000, vols. 331–337, pp. 277–82.
R.E. Stoltz and R.M. Pelloux: Metall. Trans. A, 1976, vol. 7A, p. 1295.
T.K. Hidayetoglu, P.N. Pica, and W.L. Haworth: Mater. Sci. Eng., 1985, vol. 73A, p. 65.
A. Aran, M. Demirkol, and A. Karabulut: Mater. Sci. Eng., 1987, vol. 89A, p. 35.
D.J. Lloyd: Acta Metall. Mater., 1991, vol. 39, pp. 59–71.
J.R. Griffiths: CSIRO Manufacturing and Infrastructure Technology, Kenmore, QLD, Australia, private communication, 1997.
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This article is based on a presentation given in the symposium “Dynamic Deformation: Constitutive Modeling, Grain Size, and Other Effects: In Honor of Prof. Ronald W. Armstrong,” March 2–6, 2003, at the 2003 TMS/ASM Annual Meeting, San Diego, California, under the auspices of the TMS/ASM Joint Mechanical Behavior of Materials Committee.
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Wang, Q.G. Plastic deformation behavior of aluminum casting alloys A356/357. Metall Mater Trans A 35, 2707–2718 (2004). https://doi.org/10.1007/s11661-004-0216-3
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DOI: https://doi.org/10.1007/s11661-004-0216-3