| Record |
| Title |
Karnesky, Richard A.; Meng, Liang; Dunand, David C. |
Year |
Strengthening Mechanisms in Aluminum Containing Coherent Al[sub:3]Sc Precipitates and Incoherent Al[sub:2]O[sub:3] Dispersoids |
Abbreviated Journal |
Journal Article |
| Issue |
2007 |
Keywords |
Acta Materialia |
| Address |
Acta Mater. |
| Thesis |
55 |
| Place of Publication |
4 |
Language |
1299-1308 |
Original Title |
Metal Matrix Composites; Precipitation; Aluminium Alloys; Creep; Zirconium; Al-Sc |
Series Title  |
Dispersion-strengthened-cast aluminum (DSC-Al), consisting of a coarse-grained aluminum matrix containing two populations of particles (30 vol.% of 300 nm Al[sub:2]O[sub:3] incoherent dispersoids and 0.2-0.3 vol.% of 6-60 nm coherent Al[sub:3]Sc precipitates), was studied. At ambient and elevated temperatures, both populations of particles contribute to strengthening. At 300 °C, creep threshold stresses are considerably higher than for control materials with a single population of either Al[sub:2]O[sub:3] dispersoids or Al[sub:3]Sc precipitates. This synergistic effect is modeled by considering dislocations pinned at the departure side of incoherent Al[sub:2]O[sub:3] dispersoids (detachment model) and simultaneously subjected to elastic interactions from neighboring coherent Al[sub:3Sc precipitates. |
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NU @ karnesky @ |
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1782 |
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