Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Filters applied. Clear all
. 2018 Aug 13;11(8):1422.
doi: 10.3390/ma11081422.

Aging Response and Precipitation Behavior After 5% Pre-Deformation of an Al-Mg-Si-Cu Alloy

Affiliations
Free PMC article

Aging Response and Precipitation Behavior After 5% Pre-Deformation of an Al-Mg-Si-Cu Alloy

Shuoxun Jin et al. Materials (Basel). .
Free PMC article

Abstract

In this study, Al-1.00 Mg-0.65 Si-0.24 Cu alloy was solution heat-treated, water-quenched, and then pre-deformed for 5% before aging. The peak hardness and yield strength of the pre-deformed sample with subsequent artificial aging were similar to that of a T6 condition sample. It was also found that the pre-deformation treatment could inhibit the negative influence of natural aging to some degree. After seven days of natural aging, the pre-deformed sample obtained better peak hardness and yield strength upon artificial aging than the sample without pre-deformation. In addition, the pre-deformation treatment could reduce 50% of the artificial aging time to reach the peak aging condition compared with T6 treatment. For the peak aged condition in the pre-deformed sample, transmission electron microscopy (TEM) observation found two types of precipitates exhibited along the dislocations besides the β″ precipitates in the Al matrix. Both precipitates had disordered atomic arrangements on the ordered subcell (Si network). The disordered precipitates occupied a number of Mg and Si atoms, resulting in less β″ precipitates formed during artificial aging at 180 °C.

Keywords: Al-Mg-Si-Cu alloy; mechanical properties; pre-deformation; precipitation behavior.

Conflict of interest statement

The authors declare that they have no conflict of interest.

Figures

Figure 1
Figure 1
Age-hardening curves during artificial aging at 180 °C, either with or without prior natural aging: (a) samples were water quenched after solution; (b) samples with pre-deformation after quenching.
Figure 2
Figure 2
Engineering stress–engineering strain curves of the samples: (a) PD and WQ samples without artificial aging; (b) WQ-NA and PD-NA samples without artificial aging; (c) peak artificial aged PD and WQ samples; (d) peak artificial aged WQ-NA and PD-NA samples. NA: natural aging.
Figure 3
Figure 3
SEM fractographs of peak artificial aged samples: (a,b) WQ sample; (c,d) PD sample.
Figure 4
Figure 4
SEM fractographs of peak artificial aged samples: (a,b) WQ-NA sample; (c,d) PD-NA sample.
Figure 5
Figure 5
Precipitate microstructures of the PD sample after peak artificial aging at 180 °C: (a,b) TEM bright field images; (c,d) TEM dark field images.
Figure 6
Figure 6
(a) High-resolution transmission electron microscopy (HRTEM) image of the Type 1 precipitate; (b) the corresponding fast Fourier transform (FFT) patterns of (a); (c) HRTEM image of the Type 2 precipitate; (d) the corresponding FFT patterns of (c).

Similar articles

See all similar articles

References

    1. Miller W.S., Zhuang L., Bottema J., Wittebrood A.J., Smet P.D., Haszler A., Vieregge A. Recent development in aluminum alloys for the automotive industry. Mater. Sci. Eng. A. 2000;280:37–49. doi: 10.1016/S0921-5093(99)00653-X. - DOI
    1. Immarigeon J.-P., Holt R.T., Koul A.K., Zhao L., Wallace W., Beddoes J.C. Lightweight materials for aircraft applications. Mater. Charact. 1995;35:41–67. doi: 10.1016/1044-5803(95)00066-6. - DOI
    1. Marioara C.D., Nordmark H., Andersen S.J., Holmestad R. Post-β″ phases and their influence on microstructure and hardness in 6xxx Al-Mg-Si alloys. J. Mater. Sci. 2006;41:471–478. doi: 10.1007/s10853-005-2470-1. - DOI
    1. Fallah V., Langelier B., Ofori-Opoku N., Raeisinia B., Provatas N., Esmaeili S. Cluster evolution mechanisms during aging in Al-Mg-Si alloys. Acta Mater. 2016;103:290–300. doi: 10.1016/j.actamat.2015.09.027. - DOI
    1. Edwards G.A., Stiller K., Dunlop G.L., Couper M.J. The precipitation sequence in Al-Mg-Si alloys. Acta Mater. 1998;46:3893–3904. doi: 10.1016/S1359-6454(98)00059-7. - DOI
Feedback