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Philosophical Magazine Letters Volume 93, 2013 - Issue 9
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Articles

Coarsening behaviour of gamma prime precipitates and concurrent transitions in the interface width in Ni-14 at.% Al-7 at.% Cr

S. Meher Center for Advanced Research and Technology, Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA
,
T. Rojhirunsakool Center for Advanced Research and Technology, Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA
,
J.Y. Hwang Composite Materials, Korea Institute of Science and Technology, Jeonbuk, South Korea
,
S. Nag Center for Advanced Research and Technology, Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA
,
J. Tiley Materials and Manufacturing Directorate, Air Force Research Laboratory, Dayton, OH, USA
&
R. Banerjee Center for Advanced Research and Technology, Department of Materials Science and Engineering, University of North Texas, Denton, TX, USACorrespondence[email protected]
Pages 521-530 | Received 18 Jul 2012, Accepted 11 Jun 2013, Published online: 22 Jul 2013
 
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Abstract

Coupling atom probe tomography and transmission electron microscopy, the temporal evolution of γ′ precipitate morphology and size distribution and compositional width of the γ/γ′ interface, have been tracked in a model Ni-14Al-7Cr (at.%) alloy, during isothermal annealing at 800 °C subsequent to rapid quenching. During the initial annealing period, coalescence-dominated growth and coarsening of γ′ precipitates are accompanied by a gradual decrease in the interface width, eventually leading to classical LSW coarsening with a constant interface width at extended annealing time periods.

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