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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effects of Sn content on the microstructure, phase constitution and shape memory effect of Ti-Nb-Sn alloys
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Effects of Sn content on the microstructure, phase constitution and shape memory effect of Ti-Nb-Sn alloys

机译：Sn含量对Ti-Nb-Sn合金组织，相组成和形状记忆效应的影响

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摘要

The effect of Sn content on the microstructure, phase constitution and shape memory effect of Ti-16Nb-xSn (x= 4.0, 4.5, 5.0 at%) alloys were investigated by means of optical microscopy, X-ray diffraction, transmission electron microscopy and bending test. With the increase of Sn content, the (3 phase becomes stable. The solution-treated Ti-16Nb-4Sn alloy is composed of α" and β phases at room temperature, whereas the solution-treated Ti-16Nb-5Sn alloy is only composed of β phase at room temperature. TEM observation shows that there is parallel lamellar α" martensite with the substructure of (112) type I twin in the Ti-16Nb-4Sn alloy. There exists the dislocation wall inside the single (3 phase in the Ti-16Nb-5Sn alloy. The shape recovery ratio decreases with increasing the bending strain and the bending temperature, which is in correspondence with the different deformation mechanisms at different temperature ranges. The shape recovery ratio shows a decreasing trend with the increase of Sn content at the same bending strain and temperature. The maximum completely recovery strain is around 4%.
机译：通过光学显微镜，X射线衍射，透射电子显微镜和透射电镜研究了Sn含量对Ti-16Nb-xSn（x = 4.0、4.5、5.0 at％）合金的组织，相组成和形状记忆效应的影响。弯曲试验。随着Sn含量的增加，（3相变得稳定。在室温下，固溶处理的Ti-16Nb-4Sn合金由α“和β相组成，而固溶处理的Ti-16Nb-5Sn合金仅由TEM观察表明，在Ti-16Nb-4Sn合金中存在平行的层状α“马氏体，其亚结构为（112）I型孪晶。单相（3相中）内部存在位错壁。 Ti-16Nb-5Sn合金，随着弯曲应变和弯曲温度的增加，形状恢复率降低，这与不同温度范围内不同的变形机理相对应；随着Sn含量的增加，形状恢复率呈下降趋势。在相同的弯曲应变和温度下，最大完全恢复应变约为4％。

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