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Type (up) Karnesky, Richard A.; Meng, Liang; Dunand, David C.
  Publication Strengthening Mechanisms in Aluminum Containing Coherent Al[sub:3]Sc Precipitates and Incoherent Al[sub:2]O[sub:3] Dispersoids Volume Journal Article
Pages 2007
  Abstract Acta Materialia  
  Corporate Author Acta Mater.  
Publisher 55  
Editor 4
  Summary Language 1299-1308 Series Editor Metal Matrix Composites; Precipitation; Aluminium Alloys; Creep; Zirconium; Al-Sc  
Abbreviated 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 Al2O3 incoherent dispersoids and 0.2-0.3 vol.% of 6-60 nm coherent Al3Sc 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 Al2O3 dispersoids or Al3Sc precipitates. This synergistic effect is modeled by considering dislocations pinned at the departure side of incoherent Al2O3 dispersoids (detachment model) and simultaneously subjected to elastic interactions from neighboring coherent Al[sub:3Sc precipitates.
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no NU @ karnesky @ 1782
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