Journal ArticleDOI
Stabilization of coherent precipitates in nanoscale thin films
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TLDR
In this article, the authors used the Cu-2wt.%Fe system to study the coherent to semi-coherent transition of precipitates, and showed experimentally that a coherent precipitate can be stable beyond, in nanoscale free-standing thin films.Abstract:
Coherent precipitates, on growth beyond a critical size (), become semi-coherent by the presence of interfacial misfit edge dislocations. In the case of precipitation in ‘small’ domains (matrix), the strain energy of the precipitate is altered with respect to its value in bulk domains, due to a lesser volume of strained material and domain deformations, resulting from the proximity of free surfaces. This results in a change in the value of critical size for the coherent to semi-coherent transition of the interface. In the current work, the Cu-2wt.%Fe system is used as model system to study the coherent to semi-coherent transition of precipitates. In this system, spherical Fe-2wt.%Cu precipitates form, which become cuboidal on growth beyond the critical size. Transmission electron microscopy is used to show experimentally for the first time that a coherent precipitate can be stable beyond , in nanoscale free-standing thin films (i.e. critical size for coherent to semi-coherent transition for thin films () ...read more
Citations
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Journal ArticleDOI
Liquid like nucleation in free-standing nanoscale films.
TL;DR: A liquid like nucleation behaviour in nanoscale free-standing films upon heating is demonstrated and the concept of 'depth sensitive lattice fringe imaging' is introduced, working in the nucleation dominant regime.
Journal ArticleDOI
Macroscale Stress Induced Stabilization of Coherent Precipitates
TL;DR: In this article , the effect of tensile and compressive stress on the transition from coherent to semi-coherent is studied in the case of Cu-2wt.%γFe alloy.
References
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John Price Hirth,Jens Lothe +1 more
TL;DR: Dislocations in Isotropic Continua: Effects of Crystal Structure on Dislocations and Dislocation-Point-Defect Interactions at Finite temperatures.
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G. Meyrick,G. W. Powell +1 more
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