کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7882678 | 1509612 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pseudospinodal mechanism for fine α/β microstructures in β-Ti alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Recent experimental observations in β-Ti alloys have demonstrated the formation of a dense population of fine intragranular α precipates when the alloy is step-quenched below a critical temperature. These precipitates are associated with a sudden, significant increase in the apparent nucleation rate. We developed a computational model of α precipitation in Ti alloys, via the phase-field method, in order to investigate the fundamental cause of the observed microstructural changes. We simulated the nucleation of α phase in TiMo for a series of compositions and temperatures and qualitatively reproduced the experimental observations. These results are explained via a pseudospinodal nucleation mechanism: when the system is close enough to the critical point at which the α and β phases have the same free energy, fluctuation-assisted partitionless transformation from β to α becomes the dominant precipitation pathway. Consequently a rapid increase in the nucleation rate occurs, resulting in a fine distribution of numerous intragranular α precipitates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 64, February 2014, Pages 188-197
Journal: Acta Materialia - Volume 64, February 2014, Pages 188-197
نویسندگان
A. Boyne, D. Wang, R.P. Shi, Y. Zheng, A. Behera, S. Nag, J.S. Tiley, H.L. Fraser, R. Banerjee, Y. Wang,