Effect of Nb content on micro-morphology and mechanical properties of Ti-Nb films

被引：0
|
作者：
Guo X. [1 ]
Xiao Q. [1 ]
Ma X. [2 ]
Wang G. [1 ]
机构：
[1] Materials Genome Institute, Shanghai University, Shanghai
[2] School of Materials Science & Engineering, Shanghai University, Shanghai
来源：
Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2020年 / 50卷 / 06期
关键词：
Crystal structure; Mechanical properties; Micro-morphology; Superelasticity; Ti-Nb films;
D O I：
10.1360/SST-2019-0411
中图分类号：
学科分类号：
摘要：
Ti-Nb film has attracted extensive attention due to its shape-memory effect and good biocompatibility. In this study we found that the micro-morphology, crystal structure, and mechanical properties of Ti-Nb film are tunable via adjustment of the Nb content. With increasing Nb content, the columnar crystals gradually transformed into equiaxed crystals, and (211)β gradually replaced (103)α, the crystal structure eventually coming to be composed of a single β phase. The pop-in phenomenon confirmed the material's superelasticity. The critical stresses inducing martensitic transformation of Ti-16Nb (at.%) and Ti-20Nb (at.%) films were 1761 and 2247 μN, respectively. Due to the intertwined needle-like microstructure, the hardness of Ti-20Nb (at.%) film increased to 7.43±0.12 GPa, and the yield strength increased to 2.64±0.07 GPa. At the same time, the formation of a single β phase substantially increased the elastic recovery rate to 53.49%±0.94%. The improved ability of the film to resist plastic deformation has the potential to increase the service life of a MEMS device and ensure its precision control during its service processes. © 2020, Science Press. All right reserved.
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页码：801 / 810
页数：9
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