Microstructure and properties of Al-11.0Zn-3.1 Mg-1.22Cu-0.1Sr-0.2Zr-0.1Ti-0.45Ce with strength over 800 MPa under interrupted aging
Source abstract
Abstract
This article investigated the effect of interrupted aging (T6I4) on the microstructure and properties of an ultra-high strength Al–Zn–Mg–Cu alloy and compared it with the T6 aging. The microscopic results showed that the precipitates in the sample after T6 aging were mainly η’ and η phases. The quenching and low-temperature secondary aging treatment in the T6I4 aging not only promoted the precipitation of the phases, resulting in high-density and fine precipitates inside the alloy. This provided a stronger dislocation bypassing effect, with the strength reaching 804 MPa (~ 28 MPa higher than that of the T6 sample). Furthermore, compared with the T6 sample, the T6I4 sample obtained more continuously distributed grain boundary precipitates (GBPs) and narrower precipitate free zones (PFZs) due to its higher nucleation rate, resulting in an improved elongation but reduced intergranular corrosion resistance.Graphical abstract
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
Show source-provided references
1. L. Chen, G. Chen, J. Tang, G. Zhao, C. Zhang, Evolution of grain structure, micro-texture and second phase during porthole die extrusion of Al–Zn–Mg alloy. Mater. Charact. 158, 109953 (2019)10.1016/j.matchar.2019.109953 ↗
2. G. Chen, L. Chen, G. Zhao, C. Zhang, Microstructure evolution during solution treatment of extruded Al-Zn-Mg profile containing a longitudinal weld seam. J. Alloy. Compd. 729, 210–221 (2017)10.1016/j.jallcom.2017.09.143 ↗
3. J. Ren, R. Wang, C. Peng, Y. Feng, Multistage aging treatment influenced precipitate characteristics improve mechanical and corrosion properties in powder hot-extruded 7055 Al alloy. Mater Charact 170, 110683 (2020)10.1016/j.matchar.2020.110683 ↗
4. A. Kverneland, V. Hansen, R. Vincent, K. Gjønnes, J. Gjønnes, Structure analysis of embedded nano-sized particles by precession electron diffraction. η′-precipitate in an Al–Zn–Mg alloy as example. Ultramicroscopy 106, 492–502 (2006)10.1016/j.ultramic.2006.01.009 ↗
5. G. Hu, C. Zhu, D. Xu, P. Dong, K. Chen, Effect of cerium on microstructure, mechanical properties and corrosion properties of Al-Zn-Mg alloy. J. Rare Earths 39, 208–216 (2021)10.1016/j.jre.2020.07.010 ↗
6. J. Lai, R. Jiang, H. Liu, X. Dun, Y. Li, X. Li, Influence of cerium on microstructures and mechanical properties of Al-Zn-Mg-Cu alloys. J. Cent. South Univ. 19, 869–874 (2012)10.1007/s11771-012-1085-3 ↗
7. J. Buha, R.N. Lumley, A.G. Crosky, Secondary ageing in an aluminium alloy 7050. Mater. Sci. Eng.: A. 492, 1–10 (2008)10.1016/j.msea.2008.02.039 ↗
8. F. Bai, W.L. Gao, Z.L. He, Z. Lu, Z.H. Feng, Effect of ageing processes on mechanical properties and intergranular corrosion of 7A85 aluminum alloy. Chin. J. Nonferr. Metal. 26, 957963 (2016)
9. Z. Li, L. Chen, J. Tang, G. Zhao, C. Zhang, Response of mechanical properties and corrosion behavior of Al–Zn–Mg alloy treated by aging and annealing: a comparative study. J. Alloy. Compd. 848, 156561 (2020)10.1016/j.jallcom.2020.156561 ↗
10. G. Peng, K. Chen, S. Chen, H. Fang, Influence of repetitious-RRA treatment on the strength and SCC resistance of Al–Zn–Mg–Cu alloy. Mater. Sci. Eng., A 528, 4014–4018 (2011)10.1016/j.msea.2011.01.088 ↗
11. Y. Wang, M. Liu, W. Xiao, W. Zhao, C. Ma, Effects of multi-stage aging treatments on the precipitation behavior and properties of 7136 aluminum alloy. J. Alloy. Compd. 814, 152256 (2020)10.1016/j.jallcom.2019.152256 ↗
12. K. Ma, H. Wen, T. Hu, T.D. Topping, D. Isheim, D.N. Seidman, E.J. Lavernia, J.M. Schoenung, Mechanical behavior and strengthening mechanisms in ultrafine grain precipitation-strengthened aluminum alloy. Acta Mater. 62, 141–155 (2014)10.1016/j.actamat.2013.09.042 ↗
13. K. Osamura, S. Ochiai, T. Uehara, Precipitation behavior and change of yield strength during artificial aging in Al-Zn-Mg-Cu alloys. J. Jpn. Inst. Light Met. 34, 517–524 (1984)10.2464/jilm.34.517 ↗
14. X. Xu, Q. Mao, Z. Jiang, T. Vitus, T. Zhang, W. Jia, C. Zhu, H. Wang, Effect of multi-stage solution and aging process on microstructure and properties of Al-11.2Zn-3.0Mg-1.3Cu-0.2Zr aluminum alloy extrusion. Mater. Lett. 254, 375–378 (2019)10.1016/j.matlet.2019.07.082 ↗
15. T. Ogura, S. Hirosawa, A. Cerezo, T. Sato, Atom probe tomography of nanoscale microstructures within precipitate free zones in Al–Zn–Mg(–Ag) alloys. Acta Mater. 58, 5714–5723 (2010)10.1016/j.actamat.2010.06.046 ↗
16. X. Peng, Y. Li, X. Liang, Q. Guo, G. Xu, Y. Peng, Z. Yin, Precipitate behavior and mechanical properties of enhanced solution treated Al-Zn-Mg-Cu alloy during non-isothermal ageing. J. Alloy. Compd. 735, 964–974 (2018)10.1016/j.jallcom.2017.11.178 ↗
17. W.X. Shu, L.G. Hou, C. Zhang, F. Zhang, J.C. Liu, J.T. Liu, L.Z. Zhuang, J.S. Zhang, Tailored Mg and Cu contents affecting the microstructures and mechanical properties of high-strength Al–Zn–Mg–Cu alloys. Mater. Sci. Eng. A 657, 269–283 (2016)10.1016/j.msea.2016.01.039 ↗
18. X. Li, V. Hansen, V. Hansen, J. GjØnnes, L.R. Wallenberg, HREM study and structure modeling of the η′ phase, the hardening precipitates in commercial Al–Zn–Mg alloys. Acta Mater. 47(9), 2651–2659 (1999)10.1016/S1359-6454(99)00138-X ↗
19. H. Zhong, S. Li, J. Wu, H. Deng, J. Chen, N. Yan, Z. Chen, L. Duan, Effects of retrogression and re-aging treatment on precipitation behavior, mechanical and corrosion properties of a Zr+Er modified Al-Zn-Mg-Cu alloy. Mater Charact 183, 111617 (2022)10.1016/j.matchar.2021.111617 ↗
20. L.K. Berg, J. Gjønnes, V. Hansen, X.Z. Li, M. Knutson-Wedel, G. Waterloo, D. Schryvers, L.R. Wallenberg, GP-zones in Al–Zn–Mg alloys and their role in artificial aging. Acta Mater. 49, 3443–3451 (2001)10.1016/S1359-6454(01)00251-8 ↗
21. H. Zhao, F. De Geuser, A.K. da Silva, A. Szczepaniak, B. Gault, D. Ponge, D. Raabe, Segregation assisted grain boundary precipitation in a model Al-Zn-Mg-Cu alloy. Acta Materialia. 156, 318–329 (2018)10.1016/j.actamat.2018.07.003 ↗
22. W. Yang, S. Ji, Q. Zhang, M. Wang, Investigation of mechanical and corrosion properties of an Al–Zn–Mg–Cu alloy under various ageing conditions and interface analysis of η′ precipitate. Mater. Des. 85, 752–761 (2015)10.1016/j.matdes.2015.06.183 ↗
23. A. Deschamps, Y. Brechet, Influence of predeformation and ageing of an Al-Zn-Mg-Cu alloy-II. Modeling of precipitation kinetics and yield stress, Acta Mater. 47, 293–305 (1998)
24. J. Gibbs, The collected works of. J. Willard Gibbs. Nature. 124, 119–120 (1929)10.1038/124119a0 ↗
25. D. McLean, FRANK, F., Grain boundaries in metals. Nature 181, 976–977 (1958)10.1038/181976b0 ↗
26. J.Z. Liu, J.H. Chen, D.W. Yuan, C.L. Wu, J. Zhu, Z.Y. Cheng, Fine precipitation scenarios of Al-Zn-Mg-(Cu) alloys revealed by advanced atomic-resolution electron microscopy study part I: structure determination of the precipitates in Al-Zn-Mg-(Cu) alloys. Mater. Charact. 99, 142–149 (2015)10.1016/j.matchar.2014.11.027 ↗
27. S. Hirosawa, Y. Oguri, T. Sato, Experimental and computational investigation of formation of precipitate free zones in an Al–Cu alloy. Mater. Trans. 46, 1230–1234 (2005)10.2320/matertrans.46.1230 ↗
28. A. Zindal, J. Jain, R. Prasad, S.S. Singh, R. Sarvesha, P. Cizek, M.R. Barnett, Effect of heat treatment variables on the formation of precipitate free zones (PFZs) in Mg-8Al-0.5Zn alloy. Mater Charact. 136, 175–182 (2018)10.1016/j.matchar.2017.12.018 ↗
29. P. Xia, Z. Liu, S. Bai, L. Lu, L. Gao, Enhanced fatigue crack propagation resistance in a superhigh strength Al–Zn–Mg–Cu alloy by modifying RRA treatment. Mater Charact 118, 438–445 (2016)10.1016/j.matchar.2016.06.023 ↗
30. A.K. Vasudqvan, R.D. Doherty, Grain boundary ductile fracture in precipitation hardened aluminum alloys. Acta Metallurgica. 35, 1193–1219 (1987)10.1016/0001-6160(87)90001-0 ↗
31. F. Wang, B. Xiong, Y. Zhang, B. Zhu, H. Liu, X. He, Effect of heat treatment on the microstructure and mechanical properties of the spray-deposited Al–10.8Zn–2.8Mg–1.9Cu alloy. Mater. Sci. Eng., A 486, 648–652 (2008)10.1016/j.msea.2007.09.049 ↗
32. E. Hornbogen, E.A. Starke, Overview no. 102 Theory assisted design of high strength low alloy aluminum. Acta Metall. Mater. 41, 1–16 (1993)10.1016/0956-7151(93)90334-O ↗
33. G. Fribourg, Y. Bréchet, A. Deschamps, A. Simar, Microstructure-based modelling of isotropic and kinematic strain hardening in a precipitation-hardened aluminium alloy. Acta Mater. 59, 3621–3635 (2011)10.1016/j.actamat.2011.02.035 ↗
34. R. Ghiaasiaan, B.S. Amirkhiz, S. Shankar, Quantitative metallography of precipitating and secondary phases after strengthening treatment of net shaped casting of Al-Zn-Mg-Cu (7000) alloys. Mater. Sci. Eng., A 698, 206–217 (2017)10.1016/j.msea.2017.05.047 ↗
35. N.M. Han, X.M. Zhang, S.D. Liu, D.G. He, R. Zhang, Effect of solution treatment on the strength and fracture toughness of aluminum alloy 7050. J. Alloy. Compd. 509, 4138–4145 (2011)10.1016/j.jallcom.2011.01.005 ↗
36. R. Gronsky, P. Furrer, Grain boundary precipitation in aluminum alloys: effect of boundary structure. Metall. Mater. Trans. A 12, 121–127 (1981)10.1007/BF02648516 ↗
37. S. Wei, R. Wang, H. Zhang, C. Xu, Y. Wu, Y. Feng, Influence of Cu/Mg ratio on microstructure and mechanical properties of Al–Zn–Mg–Cu alloys. J. Mater. Sci. 56, 3472–3487 (2021)10.1007/s10853-020-05438-0 ↗
38. M. Abe, K. Asano, A. Fujiwara, Influence of the precipitate-free zone width on the tensile properties of an Al-6 Wt pct Zn-1.2 Wt pct Mg alloy. Metall. Mater. Trans. B 4, 1499–1505 (1973)10.1007/BF02668000 ↗
39. A.J. Sedriks, P. Slattery, E.N. Pugh, Precipitate-free zones and stress-corrosion cracking in a ternary Al-Zn-Mg alloy. Mater. Sci. 62(1), 238–243 (1969)
40. F. Song, X. Zhang, S. Liu, Q. Tan, D. Li, The effect of quench rate and overageing temper on the corrosion behaviour of AA7050. Corrosion Sci. 78, 276–286 (2014)10.1016/j.corsci.2013.10.010 ↗
41. R.M. Su, Y.D. Qu, R.D. Li, Q.M. Xie, J.H. You, Effect of aging treatment on intergranular corrosion of spray forming 7075 alloy. Chin. J. Nonferr. Metal. 24, 659–667 (2014)
42. E. Romhanji, M. Popovic, Problems and prospect of Al-Mg alloys application in marine constructions. Metalurgija. 12, 297–307 (2006)
43. Y. Shi, Q. Pan, M. Li, X. Huang, B. Li, Effect of Sc and Zr additions on corrosion behaviour of Al–Zn–Mg–Cu alloys. J. Alloy. Compd. 612, 42–50 (2014)10.1016/j.jallcom.2014.05.128 ↗