Abstract
In this paper, the effect of prestrain on the T4 behaviour as well as fracture behaviour of AA6111 has been investigated with a view to understanding its strengthening characteristics under this condition. The evaluation methods include tensile testing, differential scanning calorimetry (DSC) and fractography using scanning electron microscopy (SEM). It was found that AA6111 develops increased strength with increasing levels of prestrain during natural aging. The application of plastic prestrain prior to natural aging increases the speed with which the various phases form during natural aging, while decreasing the volume fraction of GPI zones. Prior prestrain and subsequent natural aging show improvement in the dimpled tensile fracture. However, the role of intermetallic particles is significant in that they serve as nucleation sites for fracture.
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M. H. MULAZIMOGLU, A. ZALUSKA, F. PARAY and J. E GRUZLESKI, Metall. Mater. Trans. A28A(1997) 1289.
D. W. PASHLEY, J. W. RHODES and A. SENDOREK, J. Inst. Metals 94(1966) 41.
D. W. PASHLEY, M. H. JACOBS and J. T. VIETZ, Phil. Mag. 51(1967) 16.
C. PANSERI and T. FEDERIGHI, J. Inst. Metals 94(1966) 99.
S. CERSARA, E. DI RUSSO, P. FIORINI and A. GIARDA, Mater. Sci. Engng. 5(1969/70) 220.
T. MOONS, P. RATCHEV, P. DESMET, B. VERLINDEN and P. VAN HOUTTE, Scripta Mater. 35(1996) 939.
W. J. POOLE, D. J. LLOYD and J. D. EMBURY, Mater. Sci. Engng. A 234-236(1997) 306.
M. TAMIZIFAR and G. W. LORIMER, Aluminum alloys: Their Physical and Mechanical Properties, in Proc. 3rd Int. Conf. Aluminum, edited by L. Arnberg, O. Lohne, E. Nes and N. Ryum (1992) Vol. 1, p. 220.
D. K. CHATTERJEE and K. M. ENTWISTLE, J. Inst. Met. 101(1973) 53.
R. J. LIVAK, Metall. Trans. A13A(1982) 1318.
H. SUZUKI, M. KANNO and G. ITOH, J. Jpn. Inst. Light Met. 30(1980) 606.
T. SAKURAI and T. ETO, Aluminum Alloys: Their Physical and Mechanical Properties, in Proc. 3rd Int. Conf. Aluminum, edited by L. Arnberg, O. Lohne, E. Nes and N. Ryum (Norwegian Institute of Technology and SINTEF Metallurgy, Trondheim, 1992) Vol. 1, p. 208.
D. J. CHAKRABARTI, B. K. CHEONG and D. E. LAUGHLIN, in "Automotive Alloys II," edited by S. K. Das (TMS, Warrendale, PA, 1998) p. 27.
M. MURAYAMA, K. HONO, M. SAGA and K. KIKUCHI, Mater. Sci. Engng. A A250(1998) 127.
M. MURAYAMA and K. HONO, Acta Mater. 47(5) (1999) 1537.
G. BURGER, A. K. GUPTA, P. W. JEFFREY and D. J. LLOYD, Mater. Char. 33(1995) 23.
A. K. GUPTA, P. H. MOROIS and D. J. LLOYD, in Proc. 5th Int. Conf. on Aluminum Alloys, Grenoble, France (Transtech, Zuerich-Uetikon, Switzerland, 1996) p. 801.
A. PEROVIC, D. D. PEROVIC, G. C. WEATHERLY and D. J. LLOYD, Scripta Mater. 41(7) (1999) 703.
W. F. MIAO and D. E. LAUGHLIN, Metall. Mater. Trans. A 31A(2000) 361.
Idem., Scripta Mater. 40(7) (1999) 873.
K. M. ENTWISTLE, J. H. FELL and K. I. KOO, J. Inst. Metals 91(1962/63) 84.
A. K. GUPTA and D. J. LLOYD, "Aluminum Alloys: Their Physical and Mechanical Properties," edited by L. Arnberg et al., Norwegian Institute of Technology and SINTEF Metallurgy (Trondheim, 1992) Vol. 2, p. 21.
D. J. LLOYD, D. R. EVANS and A. K. GUPTA, Canadian Metall. Quart. 39(4) (2000) 475.
E. C. FRANZ, Light Metal Age 43(11/12) (1985) 12.
I. DUTTA and S. M. ALLEN, J. Mater. Sci. Lett. 10(1991)323.
C. BALDINI, F. MARINO and A. TOMASI, Mater. Sci. & Engng. A136, 99.
J. M. PAPAZIAN, Metall. Trans. 19A(1988) 2953.
P. BARCZY and F. TRANTA, Scand. J. Metall. 4(1975) 284.
I. KOVACS, J. LENDVAI and E. NAGY, Phys. Stat. Sol. 14(1972) 83.
G. A. EDWARDS, K. STILLER, G. L. DUNLOP and M. J. COUPER, Acta Mater. 46(11) (1998) 3893.
D. M JIANG, B. D. HONG, T. C. LEI, D. A. DOWNHAM and G. W. LORIMER, Mater. Sci. Techn. 7(1991) 1010.
G. K. QUAINOO, S. YANNACOPOULOS and A. K. GUPTA, Canad. Metall. Quart. 40(2) (2001) 211.
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Quainoo, G.K., Yannacopoulos, S. The effect of prestrain on the natural aging and fracture behaviour of AA6111 aluminum. Journal of Materials Science 39, 4841–4847 (2004). https://doi.org/10.1023/B:JMSC.0000035323.96458.68
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DOI: https://doi.org/10.1023/B:JMSC.0000035323.96458.68