کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10672457 | 1009859 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evolution of nanoscale clusters in γⲠprecipitates of a Ni-Al-Ti model alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Evolution of nanoscale clusters in γⲠprecipitates of a Ni-Al-Ti model alloy Evolution of nanoscale clusters in γⲠprecipitates of a Ni-Al-Ti model alloy](/preview/png/10672457.png)
چکیده انگلیسی
The evolution of phase separation and ordering processes determines the structure and properties of Ni-based superalloys. Here we use atom probe tomography to clarify the origin of γ particles occurring in ordered (L12) γⲠprecipitates in a Ni86.1Al8.5Ti5.4 alloy. Particularly, we elucidate the evolution from nanoscaled Ni-rich heterogeneities (Ni-rich clusters) to γ spheres and then γ plates inside γⲠprecipitates from the compositional and the thermodynamic point of view. We find that Ni supersaturation of γⲠprecipitates is relieved by formation of Ni-rich clusters, which results in an energetically more favorable state. Subsequently, coalescence introduces necking between the Ni-rich clusters and leads to the formation of γ particles. Our results demonstrate that phase separation of γⲠprecipitates is characterized by different stages with various governing driving forces.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 159, Part 2, December 2015, Pages 278-284
Journal: Ultramicroscopy - Volume 159, Part 2, December 2015, Pages 278-284
نویسندگان
F. Vogel, N. Wanderka, Z. Balogh, M. Ibrahim, P. Stender, G. Schmitz, T. Fedorova, J. Banhart,