کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11007006 | 1514608 | 2018 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The temperature dependence of high-temperature strength and deformation mechanism in a single crystal CoNi-base superalloy
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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 thermal stability and high-temperature strength of single crystal CoNi-base superalloys, Co-30Ni-10Al-7W (at%) and Co-30Ni-10Al-7W-2Ta-3Ti (at%), containing γâ²(L12) phase have been investigated. The investigated CoNi-base superalloy with alloying additions of Ti and Ta exhibits excellent γⲠsolvus temperature, 1236â¯â, and high-temperature strength, 622â¯MPa at 900â¯â, compared to reported γâ²-strengthening Co-base superalloys. Detailed analyses of the deformation mechanisms for the investigated alloys were carried out by using the transmission electron microscopy (TEM) characterization. Two different transitions of deformation mechanisms for the γⲠphase, from superpartial dislocation shearing to dislocation bypassing and to stacking fault shear, occurred in the investigated alloys as the deformation temperature increased above the peak temperatures. Meanwhile, the high-temperature strength of the investigated alloys largely decreased as the transitions of deformation mechanism took place. The influence of alloying effects on energies of faults and the relationship between high-temperature strength and deformation mechanisms were discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 735, 26 September 2018, Pages 114-120
Journal: Materials Science and Engineering: A - Volume 735, 26 September 2018, Pages 114-120
نویسندگان
Zhongding Fan, Chenchong Wang, Chi Zhang, Yunhe Yu, Hao Chen, Zhigang Yang,