Thermally activated energy, which varies linearly with static recovered strain, is calculated from static recovery experiments of pure aluminum initially plastically deformed by strain-rate-controlled tensile tests up to 10% engineering strain at room temperature. The activation energy at the initial static recovery is 20 kJ mol−1, which is much less than that of pure copper and attributed to the dislocation annihilation by glide or cross-slip as well as higher stacking fault energy. Once dislocation annihilation processes are exhausted, more energy is required for subgrains to form and then grow. Eventually the recovered strain is slowed down and gradually saturated.
Static Recovery Activation Energy of Pure Aluminum at Room Temperature
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received September 17, 2013; final manuscript received February 17, 2014; published online March 25, 2014. Assoc. Editor: Marwan K. Khraisheh.
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An-Chou, Y., Ho-Chieh, C., and Chen-Ming, K. (March 25, 2014). "Static Recovery Activation Energy of Pure Aluminum at Room Temperature." ASME. J. Eng. Mater. Technol. July 2014; 136(3): 034501. https://doi.org/10.1115/1.4026938
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