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Type Seidman, David N.; Marquis, Emmanuelle A.; Dunand, David C.
  Publication Precipitation Strengthening at Ambient and Elevated Temperatures of Heat-Treatable Al(Sc) Alloys Volume Journal Article
Pages 2002
  Abstract Acta Materialia  
  Corporate Author Acta Mater.  
Publisher 50  
Editor 16
  Summary Language 4021-4035 Series Editor Aluminum alloys; Scandium; Mechanical properties; Precipitation strengthening; Creep; Threshold stress; Al-Sc  
Abbreviated Series Title Yield strength at ambient temperature and creep resistance between 225 and 300C were investigated in dilute Al(Sc) alloys containing coherent Al3Sc precipitates, which were grown by heat-treatments to radii in the range 1.49.6 nm. The dependence of the ambient-temperature yield stress on precipitate size is explained using classical precipitation strengthening theory, which predicts a transition from precipitate shearing to Orowan dislocation looping mechanisms at a precipitate radius of 2.1 nm, in good agreement with experimental data. At 300C creep threshold stresses are observed and found to be much lower than the yield stresses, indicative of a climb-controlled bypass mechanism. The threshold stress increases with increasing precipitate radius, in qualitative agreement with a climb model taking into account stiffness and lattice mismatches between matrix and precipitates [1].
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no NU @ karnesky @ 618
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