Segregation of tungsten atoms at ZrB2 grain boundaries in strong ZrB2-SiC-WC ceramics

被引：43

作者：

Ma, Hai-Bin ^{[1
]}

Zou, Ji ^{[2
]}

Zhu, Jing-Ting ^{[3
]}

Liu, Lei-Feng ^{[2
]}

Zhang, Guo-Jun ^{[1
]}

机构：

[1] Donghua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Inst Funct Mat, Shanghai 201620, Peoples R China

[2] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

[3] Shenzhen Univ, SZU NUS Collaborat Innovat Ctr Optoelect Sci & Te, Int Collaborat Lab Mat Optoelect Sci & Technol 2D, Minist Educ,Coll Optoelect Engn, Shenzhen 518060, Peoples R China

来源：

SCRIPTA MATERIALIA | 2018年 / 157卷

基金：

中国国家自然科学基金;

关键词：

Borides; Grain boundary segregation; Ceramics; Mechanical properties; High temperature flexure strength; TEMPERATURE MECHANICAL-PROPERTIES; THERMAL RESIDUAL-STRESSES; ZIRCONIUM DIBORIDE; CARBIDE; CREEP; DENSIFICATION; DEFORMATION; STABILITY; STRENGTH; BEHAVIOR;

D O I：

10.1016/j.scriptamat.2018.07.038

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Segregation of solute atoms at grain boundaries has been found in many materials and could have a great impact on their properties. However, such important phenomenon has not been observed in early transition metal borides. In the present work, tungsten segregation at grain boundaries was found in ZrB2-SiC-WC ceramics (ZSW), particularly at ZrB2/ZrB2 rather than ZrB2/ZrC grain boundaries. Besides, densely packed dislocations, mainly in a mixed type, were found in many ZrB2 grains. The formation mechanism for W segregation and high-density dislocations in ZSW are discussed, both of which are considered to contribute the excellent high-temperature mechanical properties of ZSW. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：76 / 80

页数：5

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