کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7971163 | 1514404 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of phase decomposition and coarsening of γⲠprecipitates in Ni-12 at.% Ti alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The early stages of phase decomposition, morphological evolution of precipitates, coarsening kinetics of γⲠprecipitates and micro-hardness in Ni-12 at.% Ti alloy are studied by transmission electron microscopy (TEM) and Vickers hardness tests (VHN). Disk-shaped specimens are solution treated at 1473 K (1200 °C) and aged at 823, 923 and 1023 K (550, 650 and 750 °C) during several periods of time. TEM results show that a conditional spinodal of order occurs at the beginning of the phase decomposition and exhibit the following decomposition sequence and morphological evolution of precipitates: αsss â γⳠirregular-cuboidal + γs â γⲠcuboidal-parallelepiped + γ â η plates + γ. In general during the coarsening of γⲠprecipitates, the experimental coarsening kinetics do not fit well to the LSW or TIDC (n = 2.281) theoretical models, however the activation energies determined using the TIDC and LSW theories (262.846 and 283.6075 kJ molâ 1, respectively) are consistent with previously reported values. The highest hardness obtained at 823, 923 and 1023 K (550, 650 and 750 °C) is associated with the presence of γⲠprecipitates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 83, September 2013, Pages 35-42
Journal: Materials Characterization - Volume 83, September 2013, Pages 35-42
نویسندگان
C.G. Garay-Reyes, F. Hernández-Santiago, N. Cayetano-Castro, V.M. López-Hirata, J. GarcÃa-Rocha, J.L. Hernández-Rivera, H.J. Dorantes-Rosales, J.J. Cruz-Rivera,