کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5440741 | 1398236 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance](/preview/png/5440741.png)
چکیده انگلیسی
Nb-based '312' MAX phase has not been recognized so far, raising a hypothesis that Nb doping would destabilize the isostructural Ti3AlC2. Here we report that (Ti1âxNbx)3AlC2 could persist with a doping limitation up to x = 0.15. As demonstrated by HAADF-STEM analysis, Nb dopants homogeneously distribute among polycrystalline grains at the microscale and randomly occupy the Ti sites at the atomic level. Beyond the limitation, Nb-doped '312' phase Ti3AlC2 decomposes into (Ti,Nb)C, Nb-doped '211' phase Ti2AlC, and Nb-based '413' phase. Compared to pristine Ti3AlC2, the compressive strength of (Ti0.9Nb0.1)3AlC2 at 1200 °C increases by 130%, whereas doping at this level impairs the oxidation resistance. Improving high-temperature strength without deteriorating oxidation resistance can be achieved by 5% Nb doping.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 37, Issue 11, September 2017, Pages 3641-3645
Journal: Journal of the European Ceramic Society - Volume 37, Issue 11, September 2017, Pages 3641-3645
نویسندگان
Hui Zhang, Zhaojin Li, Chao Zhang, Jialin Li, Xiaohui Wang, Yanchun Zhou,