TY - JOUR
T1 - High strain rate superplasticity in a continuously recrystallized Al-6%Mg-0.3%Sc alloy
AU - Nieh, T. G.
AU - Hsiung, L. M.
AU - Wadsworth, J.
AU - Kaibyshev, R.
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 1998/5/1
Y1 - 1998/5/1
N2 - The superplastic properties of a cold-rolled Al-6Mg-0.3Sc alloy were studied at temperatures between 450 and 560°C and strain rates between 10-4 and 10° s-1. The alloy was observed to exhibit superplasticity over wide temperature (475-520°C) and strain rate ranges (∼10-3-10-1 s-1). It was found that the addition of Sc to Al-Mg alloys resulted in a uniform distribution of fine coherent Al3Sc precipitates which effectively pinned subgrain and grain boundaries during static and dynamic recrystallization. In this paper, the microstructural evolution during superplastic deformation was systematically examined using both optical and transmission electron microscopy. Based upon this microstructural examination, a mechanism is proposed to explain the observed high strain rate superplasticity in the alloy. A model is also proposed that describes grain boundary sliding accommodated by dislocations gliding across grains containing coherent precipitates. © 1998 Acta Metallurgica Inc.
AB - The superplastic properties of a cold-rolled Al-6Mg-0.3Sc alloy were studied at temperatures between 450 and 560°C and strain rates between 10-4 and 10° s-1. The alloy was observed to exhibit superplasticity over wide temperature (475-520°C) and strain rate ranges (∼10-3-10-1 s-1). It was found that the addition of Sc to Al-Mg alloys resulted in a uniform distribution of fine coherent Al3Sc precipitates which effectively pinned subgrain and grain boundaries during static and dynamic recrystallization. In this paper, the microstructural evolution during superplastic deformation was systematically examined using both optical and transmission electron microscopy. Based upon this microstructural examination, a mechanism is proposed to explain the observed high strain rate superplasticity in the alloy. A model is also proposed that describes grain boundary sliding accommodated by dislocations gliding across grains containing coherent precipitates. © 1998 Acta Metallurgica Inc.
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U2 - 10.1016/S1359-6454(97)00452-7
DO - 10.1016/S1359-6454(97)00452-7
M3 - RGC 21 - Publication in refereed journal
SN - 1359-6454
VL - 46
SP - 2789
EP - 2800
JO - Acta Materialia
JF - Acta Materialia
IS - 8
ER -