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Type Knipling, K.E.; Dunand, D.C.; Seidman, D.N.
  Publication Precipitation evolution in Al-Zr and Al-Zr-Ti alloys during aging at 450-600 C Volume Journal Article
Pages 2008
  Abstract Acta Materialia  
  Corporate Author  
Publisher 56  
Editor 6
  Summary Language 1182-1195 Series Editor Aluminum alloys; Zirconium; Titanium; Precipitation strengthening; Coarsening; Al-Zr  
Abbreviated Series Title The transformation of Al3Zr (L12) and Al3(Zr1-xTix) (L12) precipitates to their respective equilibrium D023 structures is investigated in conventionally solidified Al-0.1Zr and Al-0.1Zr-0.1Ti (at.%) alloys aged isothermally at 500 [degree sign]C or aged isochronally in the range 300-600 [degree sign]C. Titanium additions delay neither coarsening of the metastable L12 precipitates nor their transformation to the D023 structure. Both alloys overage at the same rate at or above 500 [degree sign]C, during which spheroidal L12 precipitates transform to disk-shaped D023 precipitates at ca. 200 nm in diameter and 50 nm in thickness, exhibiting a cube-on-cube orientation relationship with the α-Al matrix. The transformation occurs heterogeneously on dislocations because of a large lattice parameter mismatch of the D023 phase with α-Al. The transformation is very sluggish and even at 575 [degree sign]C coherent L12 precipitates can remain untransformed. Mechanisms of microstructural coarsening and strengthening are discussed with respect to the micrometer-scale dendritic distribution of precipitates.
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no NU @ karnesky @ 10274
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