Abstract
Mechanical properties at ambient and cryogenic temperatures of Al-Cu-Li alloy are required for design and fabrication of liquid hydrogen and liquid oxygen tanks of satellite launch vehicles. In the present work, bead-on-sheet, friction stir welding was carried out with three different rotation speeds. The yield and strain hardening behaviors of the welds were evaluated in temperature range of 20 K to 298 K. Both yield stress and strain hardening ability in the specimen increased with decrease in testing temperature. The dependence of yield stress on temperature was modeled on the basis of thermally activated dislocation mobility, while that of strain hardening was modeled on the temperature dependence of dynamic recovery rate parameter. The recovery parameter followed an Arrhenius-type relationship with temperature. The model parameters determined from the experimental data were further used to simulate the stress–strain curves at different sub-zero temperatures for the friction stir welds.
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Acknowledgement
MY and NPG would like to thank space technology cell (STC), IIT Kanpur, for providing funding for the present work. NN would like to thank Director, ISRO, for giving permission to publish this work.
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Manuscript submitted August 11, 2019.
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Nayan, N., Yadava, M., Gurao, N.P. et al. Sub-zero Temperature Dependence of Tensile Response of Friction Stir Welded Al-Cu-Li (AA2198) Alloy. Metall Mater Trans A 51, 1173–1182 (2020). https://doi.org/10.1007/s11661-019-05598-y
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DOI: https://doi.org/10.1007/s11661-019-05598-y