An investigation of microstructural stability in an Al-Mg alloy with submicrometer grain size

J. Wang, Y. Iwahashi, Z. Horita, M. Furukawa, M. Nemoto, R. Z. Valiev, T. G. Langdon

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Abstract

The microstructural stability of an Al-3%Mg solid solution alloy with a submicrometer-grained (SMG) structure (∼0.2 μm) was evaluated using both static annealing and transmission electron microscopy over a range of temperatures from 443 to 803 K and differential scanning calorimetry (DSC) up to 773 K. The results show that the SMG structure contains many non-equilibrium grain boundaries but recrystallization occurs at the higher temperatures giving large grains with boundaries having high-angle equilibrium configurations. There are significant differences between the DSC curves of the SMG alloy and a standard cold-rolled Al-3%Mg alloy, due primarily to the advent of significant heat release at low temperatures in the SMG alloy because of recovery at the non-equilibrium grain boundaries. A temperature of ∼500 K, close to half the absolute melting temperature, represents an effective upper limit for utilization of the SMG structure in this material.

Original languageEnglish
Pages (from-to)2973-2982
Number of pages10
JournalActa Materialia
Volume44
Issue number7
DOIs
Publication statusPublished - Jul 1996

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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    Wang, J., Iwahashi, Y., Horita, Z., Furukawa, M., Nemoto, M., Valiev, R. Z., & Langdon, T. G. (1996). An investigation of microstructural stability in an Al-Mg alloy with submicrometer grain size. Acta Materialia, 44(7), 2973-2982. https://doi.org/10.1016/1359-6454(95)00395-9