Experimental analysis and modelling of natural aging in AA7xxx Al alloys
Source abstract
Abstract
The effect of natural aging on the strengthening behavior and microstructural characteristics of AA7xxx alloys is investigated using a combination of hardness measurement, tensile testing, differential scanning calorimetry (DSC), and atom probe tomography (APT). Compositional similarities in copper-containing AA7xxx alloys result in a parallel logarithmic trend in their yield strength evolution and similar rates of natural aging. Through microstructural analysis, three types of precipitates are identified in the microstructure of the as-quenched and naturally-aged conditions of AA7075. Nucleation of Zn-Mg precipitates is the main precipitation phenomenon during natural aging of the as-quenched AA7075 alloy, while the precipitates formed during quenching remain unchanged. The kinetics of natural aging for two different AA7xxx alloys is analyzed through a reverse yield strength modelling methodology. Following validation, the methodology is used to investigate the natural aging kinetics of four different AA7xxx alloys. It is concluded that compositional similarities cause similar kinetics of precipitation during natural aging of AA7xxx alloys. The calculated parameters are used to model the yield strength evolution during natural aging of AA7xxx alloys. The model predictions are found to agree well with the experimental results reported in the literature.
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (75)
Show source-provided references
1. Recent developments in advanced aircraft aluminium alloys10.1016/j.matdes.2013.12.002 ↗
2. Stress corrosion cracking behaviour of 7xxx aluminum alloys: a literature review10.1016/S1003-6326(16)64220-6 ↗
3. Effect of predeformation and preaging at room temperture in Al-Zn-Mg-(Cu,Zr) alloys10.1016/S0921-5093(00)01883-9 ↗
4. I.J. Polmear, Wrought aluminium alloys Light Alloy 2005 97 204 doi: 10.1016/B978-075066371-7/50007-4.10.1016/B978-075066371-7/50007-4 ↗
5. Characterization and modeling of precipitation kinetics in an Al-Zn-Mg alloy10.1016/S0921-5093(00)01247-8 ↗
6. Comparative study of the application of steels and aluminium in lightweight production of automotive parts
7. Investigations on warm forming of AW-7020-T6 alloy sheet10.1016/j.jmatprotec.2014.03.024 ↗
8. Review: decomposition processes in Al-Zn-Mg alloys10.1007/BF00541825 ↗
9. The nucleation of precipitates: the system Al-Zn-Mg10.1016/0001-6160(65)90067-2 ↗
10. W.J. Poole, H.R. Shercliff, T. Castillo, Process modell for two step age hardening 7475 aluminum alloy, 13 (1997) 897–904.10.1179/026708397790285430 ↗
11. Influence of copper addition on precipitation kinetics and hardening in Al–Zn–Mg alloy10.1179/026708399101506832 ↗
12. Application of recently developed approaches to microstructural characterization and yield strength modeling of aluminum alloy AA703010.1016/j.msea.2007.10.067 ↗
13. Precipitation behaviour of Al-Zn-Mg-Cu alloy and diffraction analysis from η′ precipitates in four variants10.1016/j.jallcom.2014.05.061 ↗
14. Investigation of microstructural evolution and mechanical properties during two-step ageing treatment at 115C and 160C in an Al-Zn-Mg-Cu alloy pre-stretched thick plate10.1016/j.matchar.2007.01.006 ↗
15. Influence of quench and heating rates on the ageing response of an Al–Zn–Mg–(Zr) alloy10.1016/S0921-5093(98)00615-7 ↗
16. GP-zones in Al-Zn-Mg alloys and their role in artificial aging10.1016/S1359-6454(01)00251-8 ↗
17. Early-stage precipitation in Al-Zn-Mg-Cu alloy (7050)10.1016/j.actamat.2004.06.025 ↗
18. Age hardening in an Al-Zn-Mg alloy
19. Precipitates, zones and transitions during aging of Al-Zn-Mg-Zr 7000 series alloy10.1179/026708304225010424 ↗
20. The mechanism of nucleation and precipitation in 7075-0.7 Li alloy10.1016/0956-7151(94)90509-6 ↗
21. Formation of solute nanostructures in an Al–Zn–Mg alloy during long-term natural aging10.1016/j.jallcom.2019.153572 ↗
22. Atomic structure of solute clusters in Al–Zn–Mg alloys10.1016/j.actamat.2020.116574 ↗
23. Precipitation strengthening in naturally aged Al–Zn–Mg–Cu alloy10.1016/j.msea.2020.140719 ↗
24. Natural aging behaviors and mechanisms of 7050 and 5A90 Al alloys: a comparative study10.1016/j.msea.2018.01.119 ↗
25. Hardening nanostructures in an AlZnMg alloy10.1080/14786430701271959 ↗
26. In situ transmission electron microscopy investigation of nucleation of GP zones under natural aging in Al-Zn-Mg alloy10.1016/j.scriptamat.2021.114319 ↗
27. Solute cluster evolution during deformation and high strain hardening capability in naturally aged Al–Zn–Mg alloy10.1016/j.actamat.2021.116682 ↗
28. Effect of quenching rate on strengthening behavior of an Al-Zn-Mg-Cu alloy during natural ageing10.1016/j.msea.2020.139900 ↗
29. Double aging and thermomechanical heat treatment of AA7075 aluminum alloy extrusions10.1007/s10853-009-3879-8 ↗
30. Differential scanning calorimetry and electron diffraction investigation on low-temperature aging in Al-Zn-Mg alloys10.1007/s11661-000-0269-x ↗
31. Natural aging behavior of AA7050 Al alloy after cryogenic rolling10.1016/j.msea.2013.11.017 ↗
32. Kinetic Monte Carlo simulation of clustering in an Al-Zn-Mg-Cu alloy (7050)10.1016/j.actamat.2004.10.048 ↗
33. Formation of plate-shaped Guinier-Preston zones during natural aging of an Al-Zn-Mg-Cu-Zr alloy10.1080/09500839.2010.547525 ↗
34. Guinier-Preston zones in a high-purity Al-Zn-Mg alloy10.1080/09500839408240966 ↗
35. HREM study and structure modeling of the η′ phase, the hardening precipitates in commercial Al-Zn-Mg alloys10.1016/S1359-6454(99)00138-X ↗
36. Precipitation behavior and mechanical properties of Al–Zn–Mg alloy with high Zn concentration10.1016/j.jallcom.2020.154005 ↗
37. Process parameters for hot stamping of AA7075 and D-7xxx to achieve high performance aged products10.1016/j.jmatprotec.2018.02.039 ↗
38. Influence of pre-strain and heat treatments on the microstructure and mechanical properties of Al-Zn-Mg-Cu alloys
39. Atom probe
40. Larson · 2013
41. Ultramicroscopy A sensitivity analysis of the maximum separation method for the characterisation of solute clusters10.1016/j.ultramic.2010.12.015 ↗
42. G.A. Lloyd DJ, Aluminum Alloys and the Thermal Processing Associated with Automotive Sheet, in: Thermec 97 Proc. Int. Conf. Thermomechanical Process. Steels Other Mater., Wollongong, Australia, 1997: pp. 99–108.
43. Effect of composition on clustering reactions in AlMgSi(Cu) alloys10.1016/j.scriptamat.2003.08.030 ↗
44. Modeling of precipitation hardening for the naturally aged Al-Mg-Si-Cu alloy AA611110.1016/S1359-6454(03)00167-8 ↗
45. Aging kinetics of aluminum alloy 705010.1007/BF02643150 ↗
46. Effects of chromium and copper additions on precipitation in Al-Zn-Mg alloys10.1007/BF02913356 ↗
47. The effect of Cu on mechanical and precipitation properties of Al-Zn-Mg alloys10.1016/j.jallcom.2003.11.175 ↗
48. Calorimetric studies of precipitation and dissolution kinetics in aluminum alloys 2219 and 707510.1007/BF02642389 ↗
49. Determination of kinetic parameters from calorimetric study of solid state reactions in 7150 Al-Zn-Mg alloy10.1016/S1003-6326(11)60843-1 ↗
50. Early precipitation during cooling of an Al-Zn-Mg-Cu alloy revealed by in situ small angle X-ray scattering10.1063/1.4894768 ↗
51. A differential scanning calorimetry and vickers microhardness study of phase transformations in an Al-Zn-Mg alloy10.1080/14786430310001644990 ↗
52. Modeling of GP(I) zone formation during quench in an industrial AA7449 75 mm thick plate10.1016/j.matdes.2016.09.052 ↗
53. Precipitation of a new platelet phase during the quenching of an Al-Zn-Mg-Cu alloy
54. Analysis of age hardening precipitates of Al-Zn-Mg-Cu alloys in a wide range of quenching rates using small angle X-ray scattering10.1016/j.matdes.2018.01.037 ↗
55. Investigation of quench sensitivity of high strength Al-Zn-Mg-Cu alloys by time-temperature-properties diagrams10.1016/j.matdes.2009.12.038 ↗
56. Effect of natural aging on quench-induced inhomogeneity of microstructure and hardness in high strength 7055 aluminum alloy10.1016/j.jallcom.2014.10.195 ↗
57. Effect of quench-induced precipitation on microstructure and mechanical properties of 7085 aluminum alloy10.1016/j.matdes.2017.06.054 ↗
58. Atomic-scale investigation of the heterogeneous precipitation in the E (Al18Mg3Cr2) dispersoid of 7075 aluminum alloy10.1016/j.jallcom.2020.156890 ↗
59. The influence of quench sensitivity on residual stresses in the aluminium alloys 7010 and 707510.1016/j.matchar.2012.01.005 ↗
60. The effect of hot form quench (HFQ®) conditions on precipitation and mechanical properties of aluminium alloys10.1016/j.msea.2019.06.027 ↗
61. Experimental and numerical investigation on strengthening behavior of 7075 aluminum alloy sheets in hot forming- quenching integrated process10.1115/1.4046741 ↗
62. Analysis of three-dimensional atom-probe data by the proximity histogram10.1007/S100050010051 ↗
63. Enhanced age hardening of 7075 aluminum alloy after ultrasonic vibration10.1016/0025-5416(83)90127-1 ↗
64. Effect of Sc on aging kinetics in a direct chill cast Al-Zn-Mg-Cu alloy10.1007/s11661-008-9485-6 ↗
65. Investigation of precipitation in an Al–Zn–Mg alloy after two-step ageing treatment at 100° and 150°C10.1016/S0921-5093(99)00231-2 ↗
66. The chemistry of precipitates in an aged Al-2.1Zn-1.7Mg at% alloy
67. On the structure and composition of G-P zones in high purity AlZnMg alloys10.1016/S0036-9748(88)80060-7 ↗
68. Quantitative analysis of GP zones formed at room temperature in a 7150 Al-based alloy10.1016/0169-4332(94)00501-X ↗
69. Isothermal ageing in the T range from 0C to 180C of a Technical A1-2.0 at% Zn-1.3 at% Mg alloy after direct quench
70. Cluster evolution mechanisms during aging in Al – Mg – Si alloys10.1016/j.actamat.2015.09.027 ↗
71. A yield strength model for the Al-Mg-Si-Cu alloy AA611110.1016/S1359-6454(03)00028-4 ↗
72. Influence of predeformation and ageing of an Al–Zn–Mg alloy—II. Modeling of precipitation kinetics and yield stress10.1016/S1359-6454(98)00296-1 ↗
73. S. Esmaeili. Precipitation Hardening Behaviour of AA6111 PhD Thesis, Univ. Br. Columbia 2002 doi: 10.16953/deusbed.74839.
74. J.W. Christian The theory of transformations in metals and alloys 2002 ScienceDirect.10.1016/B978-008044019-4/50022-2 ↗
75. Effect of natural aging on quench-induced inhomogeneity of microstructure and hardness in high strength 7055 aluminum alloy10.1016/j.jallcom.2014.10.195 ↗