采用真空电弧熔炼方法制备了不同Ta含量的Nb/Nb5Si3原位复合材料，研究了Ta对材料的组织和力学性能的影响. 结果表明：Ta分布在Nb基固溶体相和Nb5Si3相中，且在Nb基固溶体中的含量要高一些. 随Ta含量的增加，合金中Nb5Si3相逐渐减少，Nb基固溶体相逐渐增多；Ta促使β-Nb5Si3相转变为α-Nb5Si3相；Ta的加入有利于合金室温和高温强度的提高，Ta含量为5at.％的合金高温力学性能最佳.
Nb/ Nb5Si3 in-situ composites were prepared by arc melting in vacuum. Effects of Ta content on the microstructure and mechanical properties of the alloys were investigated. The results show that Ta mainly distributes in Nb solid solution phase. With increasing Ta content the amount of Nb5Si3 phase decreases, while that of Nb solid solution phase increases. Ta promotes the transformation ofβ-Nb5Si3 to α-Nb5Si3. The addition of Ta is beneficial to the compressive strength at room temperature and high temperature. In addition, the compressive strength of 5at.% Ta-containing alloy is superior to that of other alloys at high temperature.
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