In the heat treatment of AA 7075, residual stress, in some cases, increases the mechanical properties of the parts, such as resistance to fatigue, and in most cases, distorts the parts. This research tried to investigate the effects of residual stress on microstructure after the solutionizing process. After homogenizing, 7075 Al alloy samples with 6 and 20 mm thicknesses were solutionized at 485 °C for 30 and 90 minutes, respectively. Then samples were quenched in 10, 30, and 50% Polyalkylene Glycol (PAG) solutions with water. Afterward, the hole drilling method was used to measure post-quench residual stress. The results showed that the hardness number dropped in 6-mm samples as the tensile residual stress increased. This stemmed from the decrease in the quench rate due to the rise in the amount of PAG. However, this trend in 20-mm samples was upward and then dropped as the PAG amount increased from 30% to 50%. The results also demonstrated that in the 6-mm sample, tensile residual stress has an inverse proportion to the hardness. As the quench rate decreased, and subsequently, the tensile residual stress raised, 6-mm samples' grain size decreased, while grains in 20-mm samples were hardly distinguishable. A decrease in 6-mm samples' grain size could be the effect of more nucleation during the recrystallization under the elastic force's influence, and consequently, raise in overall stored energy created by tensile residual stress. Therefore, in the quenched AA 7075, the tensile residual stress can contribute to the recrystallization phenomenon. This effect is created by the rise in the system's overall stored energy due to the lattice's elastic force.
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G. Totten, D. MacKenzie, Handbook of Aluminum: Vol - Physical Metallurgy and Processes (CRC Press, Boca Raton, 2003), pp. 881–971
ASTM B918/B918M-20a, Standard Practice for Heat Treatment of Wrought Aluminum Alloys (ASTM International, West Conshohocken, PA, 2013). www.astm.org
ASM, Volume 4E Heat Treating of Nonferrous Alloys (ASM International Materials Park, OH, 2014)
P.A. Rometsch, Y. Zhang, S. Knight, Heat treatment of 7xxx series aluminium alloys—some recent developments. Trans. Nonferrous Metals Soc. China 24(7), 2003–2017 (2014)
H.E Boyer, P.R. Cary, Quenching and Control of Distortion (ASM International, Metal Park, OH, 1988), p. 11
L. Espinosa, O. Zapata, F.A. Pérez-González, L.A. Reyes, R. Colás, Universidad Autónoma de Nuevo León et al., Quenching and distortion analyses in aluminum, Heat Treat 2015: Proceedings of the 28th ASM Heat Treating Society Conference, October 20–22, 2015 (ASM International, Detroit, MI, 2015)
G.S. Sarmiento, D.M. Coscia, C. Jouglard, G.E. Totten, G.M. Webster, J. Vega, Residual stresses, distortion and heat transfer coefficients of 7075 aluminum alloy probes quenched in water and polyalkylene glycol solutions, in 20th ASM Heat Treating Society Conference and Show (St. Louis, 2000)
M.B. Prime, M.R. Hill, Residual stress, stress relief, and inhomogeneity in aluminum plate. Scripta Mater. 46(1), 77–82 (2002)
M. Sedighi, D. Afshari, F. Nazari, Investigation of the effect of sheet thickness on residual stresses in resistance spot welding of aluminum sheet. IJMSE. 232(4), 621–638 (2016)
K. Muammer, J. Culp, T. Altan, Prediction of residual stresses in quenched aluminum blocks and their reduction through cold working processes. J. Mater. Process. Technol. 174(1–3), 342–354 (2006)
M. Salman, A. Jasim, Improvement properties of 7075–T6 aluminum alloy by quenching in 30% polyethylene glycol and addition 0.1%B. J. Mater. Sci. 1(6), 12–17 (2013)
B. Liscic, H.M. Tensi, L.C.F. Canale, G.E. Totten, Quenching Theory and Technology (CRC Press, USA, 2010)
T. Croucher, Using glycol to effectively control distortion and residual stresses in heat treated aluminum alloys. ASTM Int. 5(10), 3–20 (2008)
M. Maniruzzaman, M. Fontecchio, R.D. Sisson Jr., Optimization of an aluminum alloy quenching process in polyalkylene glycol polymer solution using Taguchi method, in Heat Treating And Surface Engineering: Proceedings of the 22nd Heat Treating Society Conference and the 2nd International Surface Engineering Congress: 15-17 September 2003, Indianapolis, IN (ASM International, 2003)
K. Sztwiertnia, Recrystallization, Open access: http://book.xyz/s/?q=4D3D10AD8FEDB23895B2F98C45922197&e=1 (2016), pp 43-58.
A. Rollett, F.J. Humphreys, G.S. Rohrer, M. Hatherly, Recrystallization and Related Annealing Phenomena Second Edition (Elsevier Science, Burlington, 2004), pp. 11–16
A. Baczmanski, K. Wierzbanowski, A. Benmarouane, A. Lodini, P. Lipinski, B. Bacroix, Stored energy and recrystallization process. Mater. Sci. Forum. 539–543, 3335–3340 (2007)
B. Poorganji et al., Effect of cold work and non-isothermal annealing on the recrystallization behavior and texture evolution of a precipitation-hardenable aluminum alloy. Scripta Mater. 63(12), 1157–1160 (2010)
X. Ficquet, C.E. Truman, E. Kingston, D.J. Smith, Measurement of residual stresses in aluminum alloy aerospace components, in 25th International Congress of The Aeronautical Sciences (2006), pp 1-9
G. Totten, M. Howes, T. Inoue, Handbook of Residual Stress and Deformation of Steel (Ohio, ASM International, Materials Park, 2002), pp. 248–295
T. Croucher, Effectively quenching thick sections of high strength aluminum alloys using polyalkylene glycol quenchants. SAE Amec committee (2009).
ASTM E837-20, Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method (ASTM International, West Conshohocken, PA, 2013). www.astm.org
A.D. Isadarea, B.I. Aremo, Effect of heat treatment on some mechanical properties of 7075 aluminum alloy. Mat. Res. 16(1), 190–194 (2012)
P.M. Kavalco, L.C.F. Canale, Quenching of Aluminum Alloys: Cooling rate, Strength, and Intergranular Corrosion (University of São Paulo São Carlos, SP, Brazil, 2009)
D.W Suh, S.Y Lee, Microstructural evolution of Al–Zn–Mg–Cu–(Sc) alloy during hot extrusion and heat treatments (Materials Processing Department, KIMM, 2004)
L.F. Mondolfo, Aluminum Alloys: Structure and Properties (Butterworths, London Boston, 1976), pp. 844–864
S.C. Wang, M.J. Starink, Precipitates and intermetallic phases in precipitation hardening Al–Cu–Mg–(Li) based alloys. Int. Mater. Rev. 50(4), 193–215 (2005)
G. Sha, A. Cerezo, Early-stage precipitation in Al–Zn–Mg–Cu alloy (7050). Acta Mater. 52, 4503–4516 (2004). https://doi.org/10.1016/j.actamat.2004.06.025
ASM Handbook Volume 9 Metallography and Microstructure (ASM International Materials Park, OH, 2004), pp. 86 and 337
T.R. Simes, S.G. Mellor, D.A. Hills, A note on the influence of residual stress on measured hardness. J Strain Anal. 19, 2 (1984)
J. Frankel, A. Abbate, W. Scholz, The effect of residual stresses on hardness measurements. Exp. Mech. 33, 164–168 (1993). https://doi.org/10.1007/BF02322494
K. Tosha, Influence of Residual Stresses on the Hardness Number in the Affected Layer Produced by Shot Peening. 2nd P Asia-Pacific Forum on Precision Surface Finishing and Deburring Technology, Seoul, Korea, 2002, pp. 48-54
Y. Zhang, Y. Yi, S. Huang, H. He, Influence of temperature-dependent properties of aluminum alloy on evolution of plastic strain and residual stress during quenching process. Metals (2017). https://doi.org/10.3390/met7060228
M. Tajally, Z. Huda, Recrystallization kinetic for aluminum alloy 7075. Met Sci Heat Treat. 53, 3–6 (2011)
L.M. Clarebrough, M.E. Hargreaves, M.H. Loretto, Changes in Internal Energy Associated with Recovery and Recrystallization in Recovery and Recrystallization of Metals (Interscience Publishers, New York, 1963), pp. 63–121
M.B. Bever, L.H. Holt, A.L. Titchener, The stored energy of cold work. Progress Mater. Sci. 17, 5–177 (1973)
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Porhonar, M., Razavi, S.H., Shajari, Y. et al. The Effect of Polymer Content of Quenchant on Microstructural and Mechanical Characteristics of AA-7075 Plates Before Age Hardening. Metallogr. Microstruct. Anal. (2021). https://doi.org/10.1007/s13632-021-00711-3
- Aluminum 7075
- Residual stress
- Hole drilling method