The effect of Hf and Ti additions on microstructure and properties of Cr_2Nb–Nb in situ composites
The effect of Hf and Ti additions on microstructure and properties of Cr_2Nb–Nb in situ composites
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Hf和Ti添加对Cr_2Nb-Nb原位复合材料组织和性能的影响
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
M. R. Jackson
中科院分区：
文献类型：
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作者：
B. Bewlay;M. R. Jackson
本文研究了添加Hf和Ti对Cr2Nb-Nb共晶双相复合材料组织和性能的影响。本文描述了用Hf(7.5-9.2%)和Ti(16.5-26%)变质的Laves相Cr2Nb的体积分数为50-70%的原位定向凝固复合材料的显微组织。利用电子探针和能谱分析讨论了Hf和Ti在两相之间的分配。描述了1100℃和1200℃下的拉伸性能，并与类似的硅化铌复合材料的拉伸性能进行了比较。在1200℃下，Cr2(Nb)-(Nb)复合材料的拉伸屈服强度比单块Cr2Nb提高到∼130MPa.然而，在1200℃时，硅化物基复合材料的屈服强度大约是Cr2(Nb)-(Nb)复合材料的两倍。
The present paper describes the effect of Hf and Ti additions on the microstructures and mechanical properties of two-phase composites based on the Cr_2Nb–Nb eutectic. The microstructures of directionally solidified in situ composites containing 50–70% by volume of the Laves phase Cr_2Nb which was modified with Hf (7.5–9.2%) and Ti (16.5–26%) are described. Partitioning of Hf and Ti between the two phases is discussed using microprobe and EDS results. The tensile properties at 1100 and 1200 °C are described and compared with those of an analogous niobium silicide-based composite. The Cr_2(Nb)–(Nb) composite tensile yield strengths at 1200 °C were increased over that of monolithic Cr_2Nb to ∼130 MPa. However, at 1200 °C the yield strengths of the silicide-based composites were approximately twice those of the Cr_2(Nb)–(Nb) composites.