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Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance
Zhang, Hui; Li, Zhaojin; Zhang, Chao; Li, Jialin; Wang, Xiaohui; Zhou, Yanchun; Wang, XH (reprint author), 72 Wenhua Rd, Shenyang 110016, Peoples R China.
2017-09-01
发表期刊JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN0955-2219
卷号37期号:11页码:3641-3645
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.; 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.
部门归属[zhang, hui ; li, zhaojin ; zhang, chao ; li, jialin ; wang, xiaohui] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china ; [zhang, hui ; li, zhaojin] univ chinese acad sci, beijing 700049, peoples r china ; [zhou, yanchun] aerosp res inst mat & proc technol, sci & technol adv funct composite lab, beijing 100076, peoples r china
关键词Max Phase Doping Phase Stability Strength Oxidation
学科领域Materials Science, Ceramics
资助者Youth Innovation Promotion Association, Chinese Academy of Sciences [2011152]; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase)
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/78018
专题中国科学院金属研究所
通讯作者Wang, XH (reprint author), 72 Wenhua Rd, Shenyang 110016, Peoples R China.
推荐引用方式
GB/T 7714
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.
APA Zhang, Hui.,Li, Zhaojin.,Zhang, Chao.,Li, Jialin.,Wang, Xiaohui.,...&Wang, XH .(2017).Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance.JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,37(11),3641-3645.
MLA Zhang, Hui,et al."Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance".JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 37.11(2017):3641-3645.
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