Abstract
Ultrafine grain sizes, of the order of approximately 0.2 μm, may be introduced into Al-Mg-Sc alloys by subjecting the material to severe plastic deformation through the process of equal-channel angular pressing (ECAP). Experiments were conducted to evaluate the influence of the solution treatment temperature on the ductility of an Al-3% Mg-0.2% Sc alloy after ECAP. The results show the highest ductilities are achieved when the solution treatment temperature is within the narrow range of approximately 878 to about 883 K, immediately below the temperature associated with the onset of partial melting. These high temperatures serve to maximize the amount of scandium in solid solution and this leads, on subsequent heating, to an extensive precipitation of fine secondary Al3Sc particles which inhibit grain growth at the higher temperatures. Conversely, solution treatments at temperatures below approximately 878 K give less Sc in solid solution within the matrix and the precipitation of the Al3Sc particles is then insufficient to retain a uniform ultrafine microstructure.
| Original language | English |
|---|---|
| Pages (from-to) | 2571-2576 |
| Number of pages | 6 |
| Journal | Journal of Materials Research |
| Volume | 15 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Jan 1 2000 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
Influence of scandium on superplastic ductilities in an Al-Mg-Sc alloy. / Komura, Shogo; Horita, Zenji; Furukawa, Minoru; Nemoto, Minoru; Langdon, Terence G.
In: Journal of Materials Research, Vol. 15, No. 11, 01.01.2000, p. 2571-2576.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of scandium on superplastic ductilities in an Al-Mg-Sc alloy
AU - Komura, Shogo
AU - Horita, Zenji
AU - Furukawa, Minoru
AU - Nemoto, Minoru
AU - Langdon, Terence G.
PY - 2000/1/1
Y1 - 2000/1/1
N2 - Ultrafine grain sizes, of the order of approximately 0.2 μm, may be introduced into Al-Mg-Sc alloys by subjecting the material to severe plastic deformation through the process of equal-channel angular pressing (ECAP). Experiments were conducted to evaluate the influence of the solution treatment temperature on the ductility of an Al-3% Mg-0.2% Sc alloy after ECAP. The results show the highest ductilities are achieved when the solution treatment temperature is within the narrow range of approximately 878 to about 883 K, immediately below the temperature associated with the onset of partial melting. These high temperatures serve to maximize the amount of scandium in solid solution and this leads, on subsequent heating, to an extensive precipitation of fine secondary Al3Sc particles which inhibit grain growth at the higher temperatures. Conversely, solution treatments at temperatures below approximately 878 K give less Sc in solid solution within the matrix and the precipitation of the Al3Sc particles is then insufficient to retain a uniform ultrafine microstructure.
AB - Ultrafine grain sizes, of the order of approximately 0.2 μm, may be introduced into Al-Mg-Sc alloys by subjecting the material to severe plastic deformation through the process of equal-channel angular pressing (ECAP). Experiments were conducted to evaluate the influence of the solution treatment temperature on the ductility of an Al-3% Mg-0.2% Sc alloy after ECAP. The results show the highest ductilities are achieved when the solution treatment temperature is within the narrow range of approximately 878 to about 883 K, immediately below the temperature associated with the onset of partial melting. These high temperatures serve to maximize the amount of scandium in solid solution and this leads, on subsequent heating, to an extensive precipitation of fine secondary Al3Sc particles which inhibit grain growth at the higher temperatures. Conversely, solution treatments at temperatures below approximately 878 K give less Sc in solid solution within the matrix and the precipitation of the Al3Sc particles is then insufficient to retain a uniform ultrafine microstructure.
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U2 - 10.1557/JMR.2000.0367
DO - 10.1557/JMR.2000.0367
M3 - Article
AN - SCOPUS:0034333883
VL - 15
SP - 2571
EP - 2576
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 11
ER -