High-temperature strength of directionally reinforced LaB6-TiB2 composite

被引：38
|
作者：
Bogomol, I. [1 ,2 ]
Nishimura, T. [2 ]
Vasylkiv, O. [2 ]
Sakka, Y. [2 ]
Loboda, P. [1 ]
机构：
[1] Natl Tech Univ Ukraine KPI, UA-03056 Kiev, Ukraine
[2] Natl Inst Mat Sci, Nano Ceram Ctr, Tsukuba, Ibaraki 3050047, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 505卷 / 01期
关键词：
Ceramic composites; Lanthanum hexaboride; Titanium diboride; Directional crystallization; Bending strength; MECHANICAL-PROPERTIES; LAB6-ZRB2; COMPOSITES; SOLIDIFIED EUTECTICS; CRYSTALLOGRAPHY; PECULIARITIES; ALLOYS; SYSTEM;
D O I：
10.1016/j.jallcom.2010.05.003
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A directionally solidified eutectic LaB6-TiB2 composite was prepared by the floating zone method based on the crucible-free zone melting of compacted powders. TiB2 and LaB6 powders were used as the initial materials. The bending strength of the melted eutectic LaB6-TiB2 composite was evaluated in the temperature range of 1000-1600 degrees C and reached 470 MPa at 1400 degrees C. We speculate that the bending strength of the directionally reinforced LaB6-TiB2 composite at high temperatures mainly depends on the plasticity of the TiB2 fibers and LaB6 matrix. By analyzing the dislocation structure of the fibers, the occurrence of strain hardening in monocrystalline titanium diboride during high-temperature deformation was revealed. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：130 / 134
页数：5
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