Abstract
The heat treatable aluminium alloy AA2219 is subjected to mechanical stress relieving by way of cold deformation after solution treatment to relieve the quenched in stresses as thermal stress relieving is not possible due to the requirement of higher temperature than the ageing temperature. Cold deformation prior to aging has also been found to yield improved strength. Though this phenomenon is to some extent being exploited in aluminium alloy AA2219 sheets and plates, there is no experimental data available to understand the influence of cold compression on the extent of benefits obtainable on mechanical properties in forgings. In the present study to identify a thermo-mechanical treatment that can yield the maximum tensile strength, solution treated AA2219 forgings were subjected to cold deformation ranging from 0 to 25% and then artificially aged. The results indicates that the maximum room temperature tensile strength (both UTS and 0.2% PS) can be obtained at 10% post solution treatment cold deformation. As this alloy is being used for low temperature applications, it is very essential to assess the effect of higher cold compression on the low temperature (77 K) properties and the results show that the 77 K tensile properties more or less same beyond 2% cold deformation. As the weld properties are around 50% of the parent metal properties, any increase in the mechanical properties, is considered to be very crucial and very much needed for this alloy in the absence of aluminium–lithium alloy technology. Hence this study indicate that there is a good scope to increase the amount of cold compression after Solution treatment instead of restricting the same to 2%–5% maximum.
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References
R.P. Reed et al., Aluminium Alloys for ALS Cryogenic Tanks: Comparative Measurements of Cryogenic Mechanical Properties of Al–Li Alloys and Alloy 2219 (Philips Laboratory, Kirtland Air Force Base, 1991)
J. Sessler et.al., Materials Data Handbook: Aluminium Alloy 221, 1966, NASA, CR-74554
E.L. Rooy, Introduction to aluminium and aluminium alloys, in Properties and Selection: Nonferrous Alloys and Special Purpose Materials, Metals Handbook, 10th edn, vol 2 (ASM International, The Materials Information Society, 1990), pp. 3–14
J. R. Davis (ed.) Aluminum and Aluminum Alloys, ASM Specialty Handbook (ASM International, Materials Park Ohio, 1994), pp. 290–315. www.asminternational.org
AMS 2772, Aerospace Materials Specification, Heat treatment of Aluminium Raw Materials 2016-04-19
D.J. Filomeo, Effects of A Solution Anneal Quench Delay on the Heat Treatment Response of Aluminum 2219-T6, Sr. Project report, June 4th, (2010)
R.S. Yassar et al., The effect of cold deformation on the kinetics of the β” precipitates in an Al–Mg–Si alloy. Metall. Mater. Trans. A 36, 2059–2065 (2005)
E.H. John, in Aluminium: Properties and Physical Metallurgy, ed. by J.E. Hatch (ASM International, Russell, 1984)
R.W. Cahn et al., Physical Metallurgy (Elsevier, Amsterdam, 1996)
J.W. Martin, Micromechanisms in Particle Hardened Alloys (Cambridge University Press, Cambridge, 1980)
S.E.A. Jr, Mater Sci Engg 29, 99 (1977)
S. Singh et al., Influence of thermomechanical ageing on tensile properties of 2014 aluminium alloy. Mater. Sci. 25, 3894–3900 (1990)
G. Zhao et al., Thermomechanical aging of 2014 aluminum alloy. J. Northeast Univ. Nat. Sci. 22(6), 664–667 (2001)
S. Jin et al., Aging response and precipitation behavior after 5% pre-deformation of an Al–Mg–Si–Cu alloy. Materials 11(8), 1422 (2018). https://doi.org/10.3390/ma11081422
RK Gupta et.al., Studies on Thermo-mechanical treatment of Al alloy AA2219. Mater. Sci. Heat Treat. (2015). https://doi.org/10.1007/s11041-015-9888-0
A.N. Li-Hui et al., Effect of pre-deformation on microstructure and mechanical properties of AA2219 aluminum alloy sheet by thermomechanical treatment. Trans. Nonferrous Met. Soc. China 22, s370–s375 (2012)
G. Revankar et al., Influence of cold work on the microstructural evolution and hardness during ageing of AA6061 alloy. Trans. Indian Inst. Met. 70(3), 623–630 (2017)
I. Zuiko et al., Effect of cold plastic deformation on mechanical properties of aluminum Alloy 2519 after ageing. Mater Sci Forum 794–796, 888–893 (2014)
J.-F. Li et al., Influence of pre-deformation on aging precipitation behavior of three Al–Cu–Li Alloys. Acta Metall. Sinica Engl. Lett. 30(2), 133–145 (2017). https://doi.org/10.1007/s40195-016-0519-6
Acknowledgements
The authors are thankful to Dy. Director, SRQA, LPSC for his constant and consistent encouragement during the course of this study. The authors are also grateful to Director, LPSC for having given permission to publish this work. The authors wish to express their sincere thanks to M/S. Rachamallu forgings (P) ltd, for their whole hearted support in forging and heat treatment operations. Thanks are also due to Material Testing facility of QC-Materials Division, VSSC and Metallography facilities of VSSC, LPSC, and IPRC, low temperature facility for their excellent support.
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Arumugam, M., Narayanan, P.R. & Muthupandi, V. Influence of Thermomechanical Treatments on the Microstructure and Mechanical Properties of Aluminium Alloy AA2219 Hand Forgings. Met. Mater. Int. 27, 1428–1437 (2021). https://doi.org/10.1007/s12540-019-00557-z
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DOI: https://doi.org/10.1007/s12540-019-00557-z