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题名: Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance
作者: Zhang, Hui;  Li, Zhaojin;  Zhang, Chao;  Li, Jialin;  Wang, Xiaohui;  Zhou, Yanchun
发表日期: 2017-9-1
摘要: 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 (Ti1-xNbx)(3)AlC2 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)(3)AlC2 at 1200 degrees 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. (C) 2017 Elsevier Ltd. All rights reserved.
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Recommended Citation:
Zhang, Hui,Li, Zhaojin,Zhang, Chao,et al. Nb Doping In Ti3alc2: Effects On Phase Stability, High-temperature Compressive Properties, And Oxidation Resistance[J]. Journal Of The European Ceramic Society,2017,37(11):3641-3645.

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