Microstructure, mechanical property and oxidation property in Ni3Si–Ni3Ti–Ni3Nb multi-phase intermetallic alloys
Microstructure, mechanical property and oxidation property in Ni3Si–Ni3Ti–Ni3Nb multi-phase intermetallic alloys
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DOI：
10.1016/j.msea.2005.04.023
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发表时间：
2005-06
期刊：
影响因子：
6.4
通讯作者：
K. Ohira;Y. Kaneno;T. Takasugi
中科院分区：
文献类型：
--
作者：
K. Ohira;Y. Kaneno;T. Takasugi
研究了由L1{sub2}、D0{sub24}和D0{suba}相组成的Ni{sub3}Si-Ni{sub3}Ti-Ni{sub3}Nb伪三元合金系多相金属间化合物合金的显微组织、高温压缩变形、高温拉伸变形和氧化性能。这些多相金属间化合物合金的显微组织在很大程度上取决于合金成分。通过固相反应从L1{sub2}基体中析出具有一定取向关系和习惯面的魏氏相Ni{sub3}Ti(D0{sub24})。在较宽的试验温度范围内，随着Si含量的增加，即L1{sub2}相的体积分数的增加，这些多相合金的拉伸应力和拉伸伸长率都增加。这些多相金属间化合物合金中添加百万分之五十的硼会导致拉应力和拉伸伸长率增加。结果表明，硅含量高的多相金属间化合物合金具有良好的抗氧化性能，并伴有连续的硅酸盐涂层。综合性能评价结果表明，由D0{sub24}和D0{suba}相弥散的L1{sub2}母体组成的高硅多相金属间化合物合金具有最好的高温机械和化学性能。
Microstructure, high-temperature compressive and tensile deformation, and oxidation property of multi-phase intermetallic alloys, which were based on the Ni{sub 3}Si-Ni{sub 3}Ti-Ni{sub 3}Nb pseudo-ternary alloy system and composed of L1{sub 2}, D0{sub 24} and D0{sub a} phases, were investigated. The microstructures of these multi-phase intermetallic alloys were largely dependent on alloy composition. The Widmansttaten-like Ni{sub 3}Ti(D0{sub 24}) phase was precipitated from L1{sub 2} matrix by a solid-state reaction, accompanied with a certain orientation relationship and habit plane. The tensile stress as well as the tensile elongation of these multi-phase alloys increased with increasing Si content, i.e. the volume fraction of L1{sub 2} phase in the wide range of test temperatures. Fifty parts per million boron addition to these multi-phase intermetallic alloys resulted in increased tensile stress and tensile elongation. It was found that the multi-phase intermetallic alloy with a high Si content had good oxidation resistance, accompanied with a continuous silicate layer. From an overall evaluation of the properties examined, it was shown that the multi-phase intermetallic alloy that had a high Si content and was composed of L1{sub 2} matrix dispersed by D0{sub 24} and D0{sub a} phases had the most favorable properties as high-temperature mechanical and chemical materials.