Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance

被引：31

作者：

Zhang, Hui ^{[1
,2
]}

Li, Zhaojin ^{[1
,2
]}

Zhang, Chao ^{[1
]}

Li, Jialin ^{[1
]}

Wang, Xiaohui ^{[1
]}

Zhou, Yanchun ^{[3
]}

机构：

[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 700049, Peoples R China

[3] Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, Beijing 100076, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2017年 / 37卷 / 11期

关键词：

MAX phase; Doping; Phase stability; Strength; Oxidation; MECHANICAL-PROPERTIES; THERMAL-EXPANSION; TI2ALC; TI; MICROSTRUCTURE; STIFFNESS; BEHAVIOR; NB4ALC3; AL2O3;

D O I：

10.1016/j.jeurceramsoc.2017.04.026

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

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.

引用

页码：3641 / 3645

页数：5

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