Effects of Retrogression Treatment Process on the Mechanical Properties and Corrosion Behavior of the Graphene/7075 Aluminum Matrix Composite

Abstract:

The influence of various retrogression and re-ageing (RRA) treatment processes on the hardness, electrical conductivity and corrosion behavior of graphene/7075 aluminum matrix composite were investigated. The results showed that the hardness decreased swiftly at the initial stage and short time to peak value as the retrogression temperature (170 °C, 180 °C, 190 °C, 200 °C) rises. In the RRA 180 °C/120 min process, the electrical conductivity and peak-aging Brinell hardness were 37.9%IACS, 192.8. This RRA treatment possessed excellent pitting corrosion resistance, and the corresponding pitting potential (E_pit), the passivation potential (E_pit-E_corr), the pitting corrosion current density (Logi_corr) were -0.756V, 0.558V, -1.836A/cm², respectively. This enhance can attribute that the continuous η phase distributed along the grain boundary became intermittent and coarse in the retrogression stage.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 747-755
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.747
• Online since: May 2020
• Authors: Bing Hui Ren, Kang Wang, Ran Wang, Jin Feng Leng*
• Keywords: Corrosion Behavior, Graphene/7075 Aluminum Matrix Composite, Hardness, Re-Ageing, Retrogression, η Phase

References

[1] Zuo Y, Cui J, Dong J, et al. Effect of low frequency electromagnetic field on the constituents of a new super high strength aluminum alloy, J. Alloys Compd. 402 (2005) 149-155.

DOI: 10.1016/j.jallcom.2005.04.135

[2] Song F X, Zhang X M, Liu S D, et al. Exfoliation corrosion behavior of 7050-T6 aluminum alloy treated with various quench transfer time, T. Nonferr. Metal. Soc. 24 (2014) 2258-2265.

DOI: 10.1016/s1003-6326(14)63342-2

[3] Gao M, Feng C R, Wei R P. An analytical electron microscopy study of constituent particles in commercial 7075-T6 and 2024-T3 alloys, Metall. Mater. Trans. A. 29 (1998) 1145-1151.

DOI: 10.1007/s11661-998-0240-9

[4] Nur Ismarrubie Z, Loh, K.W, Yussof H. Effect of Heat Treatment on Mechanical Properties and Susceptibility to Stress Corrosion Cracking of Aluminium Alloy, Adv. Mater. Res. 845 (2014) 178-182.

DOI: 10.4028/www.scientific.net/amr.845.178

[5] Abolfazl Azarniya, Ali Karimi Taheri, Kourosh Karimi Taheri, Recent advances in ageing of 7xxx series aluminum alloys: A physical metallurgy perspective, J. Alloys Compd. 781 (2019) 945-983.

DOI: 10.1016/j.jallcom.2018.11.286

[6] Feng C, Liu Z Y, Ning A L, et al. Retrogression and re-aging treatment of Al-9.99%Zn-1.72%Cu-2.5%Mg-0.13%Zr aluminum alloy, T. Nonferr. Metal. Soc. 16 (2006) 1163-1170.

DOI: 10.1016/s1003-6326(06)60395-6

[7] Angappan M, Sampath V, Ashok B, et al. Retrogression and re-aging treatment on short transverse tensile properties of 7010 aluminium alloy extrusions, Mater. Design. 32 (2011) 4050-4053.

DOI: 10.1016/j.matdes.2011.03.034

[8] Ou B L, Yang J G, Wei M Y. Effect of homogenization and ageing treatment on mechanical properties and stress-corrosion cracking of 7050 alloys, Metall. Mater. Trans. A. 38 (2007) 1760-1773.

DOI: 10.1007/s11661-007-9200-z

[9] Oliveira A F, Barros M C D, Cardoso K R, et al. The effect of RRA on the strength and SCC resistance on AA7050 and AA7150 aluminium alloys, Mater. Sci. Eng. A. 379 (2004) 321-326.

DOI: 10.1016/j.msea.2004.02.052

[10] Lin J C, Liao H L, Jehng W D, et al. Effect of heat treatments on the tensile strength and SCC-resistance of AA7050 in an alkaline saline solution, Corros. Sci. 48 (2006) 3139-3156.

DOI: 10.1016/j.corsci.2005.11.009

[11] Oliveira A F, Barros M C D, Cardoso K R, et al. The effect of RRA on the strength and SCC resistance on AA7050 and AA7150 aluminium alloys, Mater. Sci. Eng. A. 379 (2004) 321-326.

DOI: 10.1016/j.msea.2004.02.052

[12] Marlaud T, Deschamps A, Bley F, et al. Evolution of precipitate microstructures during the retrogression and re-ageing heat treatment of an Al–Zn–Mg–Cu alloy, Acta. Mater. 58 (2010) 4814-4826.

DOI: 10.1016/j.actamat.2010.05.017

[13] Li J F, Zheng Z Q, Li S C, Chen W J, Ren W D, Zhao X S. Simulation study on function mechanism of some precipitates in localized corrosion of Al alloys, Corros. Sci. 49 (2007) 2436-2449.

DOI: 10.1016/j.corsci.2006.12.002

[14] Danh N C, Rajan K, Wallace W. TEM study of microstructure changes during retrogression and re-ageing in 7075 aluminium, Metall. Trans. A. 14 (1983) 1843-1850.

DOI: 10.1007/bf02645554