کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10620171 | 988593 | 2013 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Coarsening kinetics of γⲠprecipitates in cobalt-base alloys
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Coarsening kinetics of γⲠprecipitates in cobalt-base alloys Coarsening kinetics of γⲠprecipitates in cobalt-base alloys](/preview/png/10620171.png)
چکیده انگلیسی
The expeditious development of novel cobalt-base γ-γⲠalloys as possible next generation superalloys critically depends on achieving a comprehensive understanding of the coarsening kinetics of ordered γⲠprecipitates. This paper discusses the coarsening of L12 ordered Co3(W, Al) precipitates in a model ternary Co-10Al-10W (at.%) alloy during isothermal annealing at 800 and 900 °C. The experimentally determined temporal evolution of average size of the γⲠprecipitates suggests classical matrix diffusion limited Lifshitz-Slyozov-Wagner coarsening at both temperatures. The γⲠcoarsening rate constants have been determined using a modified coarsening rate equation for non-dilute solutions. Furthermore, using the Cahn-Hilliard formulation for interfacial energy, the γ/γⲠinterfacial energies at the respective annealing temperatures have been correlated to the concentration profile across the interface that has been experimentally determined using atom probe tomography. The calculated interfacial energies are in comparable range with those observed in nickel-base superalloys. Additionally, this analysis has permitted, for the first time, the determination of the gradient energy coefficient for γ/γⲠinterfaces in Co-base alloys, a critical input for phase-field and other simulation models for microstructural evolution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 11, June 2013, Pages 4266-4276
Journal: Acta Materialia - Volume 61, Issue 11, June 2013, Pages 4266-4276
نویسندگان
S. Meher, S. Nag, J. Tiley, A. Goel, R. Banerjee,