High-temperature strength of directionally reinforced LaB6–TiB2 composite
High-temperature strength of directionally reinforced LaB6–TiB2 composite
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DOI：
10.1016/j.jallcom.2010.05.003
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发表时间：
2010-08
影响因子：
6.2
通讯作者：
I. Bogomol;T. Nishimura;O. Vasylkiv;Y. Sakka;P. Loboda
中科院分区：
文献类型：
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作者：
I. Bogomol;T. Nishimura;O. Vasylkiv;Y. Sakka;P. Loboda
基于压实粉末的无坩埚区域熔炼，采用浮区法制备了定向凝固共晶LaB6-TiB2复合材料。以TiB_2和LaB_6粉末为起始原料。熔融共晶LaB6-TiB2复合材料的抗弯强度在1000-1600℃范围内测定，在1400℃时达到470 Mpa。推测定向增强LaB6-TiB2复合材料的高温抗弯强度主要取决于TiB2纤维和LaB6基体的塑性。通过对纤维位错结构的分析，揭示了单晶二硼化钛在高温变形过程中发生的应变硬化现象。
A directionally solidified eutectic LaB6–TiB2composite was prepared by the floating zone method based on the crucible-free zone melting of compacted powders. TiB2and LaB6powders were used as the initial materials. The bending strength of the melted eutectic LaB6–TiB2composite was evaluated in the temperature range of 1000–1600°C and reached 470MPa at 1400°C. We speculate that the bending strength of the directionally reinforced LaB6–TiB2composite at high temperatures mainly depends on the plasticity of the TiB2fibers and LaB6matrix. By analyzing the dislocation structure of the fibers, the occurrence of strain hardening in monocrystalline titanium diboride during high-temperature deformation was revealed.