کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7969215 | 1514346 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Elements distribution and deformation features of a 4.5% Re nickel-based single crystal superalloy during creep at high temperature
ترجمه فارسی عنوان
ویژگی های توزیع و تغییر شکل عناصر یک ابررسانای تک کریستالی بر پایه نیکل 4.5٪ در زمان خزش در دمای بالا
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
By means of creep property measurement, microstructure observation and atom probe tomography, the elements distribution and deformation features of a 4.5% Re nickel-based single crystal superalloy during creep are investigated. Results show that after fully heat treated, the elements Al and Ta are mainly distributed in γⲠphase of alloy. After the alloy is crept up to fracture at 1100â¯Â°C/137â¯MPa, the change of the elements distributing in γ and γⲠphases occurs, wherein, the concentration decrement of the elements Al and Cr in γⲠand γ phases is attributed to their oxidation which may consume the ones. Moreover, some of the atoms Re, W and Mo dissolving in γⲠphase are repelled into γ matrix to reduce its internal energy. And the peak concentration of the atoms Re and W appears in the γ phase near the transition region, the atoms Re, W in the peak region cause the lattice distortion to increase the resistance of dislocations motion, which may improve the creep resistance of alloy. In the later stage of creep, dislocations shearing into the rafted γⲠphase may cross-slip from {111} to {100} plane to form the configuration of K-W locks, which may restrain the slipping of dislocations to improve the creep resistance of alloy. Wherein, the atom Re with lower diffusion coefficient may delay the dislocations in K-W locks for slipping and cross-slipping, which is thought to be the main reason of the K-W locks keeping in 4.5%Re alloy during creep at 1100â¯Â°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 141, July 2018, Pages 433-441
Journal: Materials Characterization - Volume 141, July 2018, Pages 433-441
نویسندگان
Delong Shu, Sugui Tian, Lirong Liu, Baoshuai Zhang, Ning Tian,