An investigation of microstructural stability in an Al-Mg alloy with submicrometer grain size
- Kyushu Univ., Fukuoka (Japan). Dept. of Materials Science and Engineering
- Russian Academy of Sciences, Ufa (Russian Federation). Inst. for Metals Superplasticity Problems
- Univ. of Southern California, Los Angeles, CA (United States)
The microstructural stability of an Al-3%Mg solid solution alloy with a submicrometer-grained (SMG) structure ({approximately}0.2 {micro}m) 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 {approximately}500 K, close to half the absolute melting temperature, represents an effective upper limit for utilization of the SMG structure in this material.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 264112
- Journal Information:
- Acta Materialia, Vol. 44, Issue 7; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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