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1.
《International Journal of Hydrogen Energy》2019,44(55):29371-29379
The paper analyzes the effect of electrolytic hydrogenation on martensite transformation temperatures in binary TiNi alloys. The analysis shows that this effect can be strong or weak depending on the phase state of TiNi. Research data are presented on the diffusivity of hydrogen in binary TiNi alloys in martensite and austenite states. The diffusion coefficient of hydrogen is estimated from its distribution measured by glow discharge spectroscopy in TiNi after hydrogenation. The experimental results about the formation of TiNiH hydride in the martensitic and austenitic state in binary TiNi based alloys are also presented. 相似文献
2.
采用两步法成功制备了新型钛镍合金Ti Ni45V8In0.2,并进行XRD、SEM以及力学性能、抗应力松弛性能和耐腐蚀性能的测试与分析。结果表明:该新型合金由网状Ti Ni母相和弥散分布的V3Ni相组成,具有较佳的力学性能、抗应力松弛性能和耐腐蚀性能。与常规Ti Ni合金相比,新型合金的-40、25℃和150℃抗拉强度分别增加47.1%、39.4%、123.9%;-40、25℃和150℃屈服强度分别增加110.3%、92.5%、263.8%;腐蚀电位正移267 m V;50 h后的应力松弛从16%减小至0.5%。 相似文献
3.
大塑性变形技术制备块状超细晶TiNi基形状记忆合金研究进展 总被引:1,自引:0,他引:1
详细介绍了块状超细晶TiNi基形状记忆合金的研究进展,包括其制备工艺与显微组织、马氏体相变行为、力学性能和形状记忆特性以及超弹性性能,并介绍了其在医学和工程领域的实际应用,最后探讨了块状超细晶TiNi基形状记忆合金今后的研究发展方向。 相似文献
4.
5.
TiNi表面磁控溅射DLC薄膜的纳米压痕与摩擦性能 总被引:1,自引:0,他引:1
采用室温磁控溅射技术在TiNi合金表面制备出DLC/SiC(类金刚石/碳化硅)双层薄膜(SiC为中间层),采用拉曼光谱仪、纳米压痕仪和球-盘式摩擦磨损仪研究DLC薄膜的结构、纳米压痕和摩擦性能.结果表明:制备的DLC/SiC薄膜石墨含量高、纳米硬度(5.493 GPa)低、弹性模量(62.2447 GPa)低.在以氮化硅球(半径为2mm)为对摩件,4.9N载荷、室温、Kokubo人体模拟体液润滑下,该DLC/SiC薄膜具有低且稳定的摩擦因数,其平均值约为0.094. 相似文献
6.
采用纯Cu中间层,对TiNi形状记忆合金丝脉冲激光焊接进行研究。利用光学显微镜,扫描电镜,微区XRD等分析测试手段,研究了TiNi形状记忆合金丝激光焊接头的微观组织特点。为研究接头的力学性能和形状记忆效应,对其进行拉伸和弯曲试验。结果表明,焊缝区组织分布不均匀,不同形貌区域的成分差别较大,XRD分析焊缝区生成了B2,B19’,Ti3Ni4,Cu基固溶体及Cu与Ti的金属间化合物相CuTi,Cu4Ti3,Cu3Ti2,Cu3Ti等。TiNi形状记忆合金激光焊接头抗拉强度为489~536MPa,断口呈典型的韧-脆混合断裂特征。形状记忆恢复率达99%以上。 相似文献
7.
Z. ZlatanovaT. Spassov G. EggelerM. Spassova 《International Journal of Hydrogen Energy》2011,36(13):7559-7566
Mg2Ni-TiFe and Mg2Ni-TiNi nanocomposites were prepared by milling for a short time of two preliminary milled to a nanocrystalline state hydrogen absorbing phases, Mg2Ni and TiFe or Mg2Ni and TiNi. The milling results in a sufficient density of contacts between the fine powder particles with different composition. The presence of a large amount of such inter-particles contacts leads to lowering of the initial temperature of the composites gas phase hydriding, as in the same time the temperature range of hydriding is enlarged, compared to the composites components.On the grounds of the proved low temperature hydriding (≤200 °C) of the nanocomposites, taking place with appropriate kinetics, the possibility for improved electrochemical hydriding was checked, exploiting the idea for charging Mg2Ni particles through the contacts with TiFe/TiNi. In this way we are supposed to achieve more complete electrochemical hydriding of the Mg2Ni particles, which are usually only superficially hydrogenated at room temperature, mainly due to the low diffusion coefficient of hydrogen in the Mg2Ni crystal lattice and corrosion processes in strong alkaline solutions. The achieved discharge capacity for the Mg2Ni-TiFe composite is essentially higher compared to that of the mechanical mixture of the two composite’s components. 相似文献
8.
9.
溅射富Ti-TiNi形状记忆合金薄膜 总被引:3,自引:0,他引:3
采用X射线衍射(XRD)、透射电子显微镜(TEM)和电阻-温度曲线等方法研究了近等原子的富TiTiNi合金薄膜的析出相和相变等特征,并对结果进行了详细讨论。 相似文献
10.
Ageing of Ti1.02−xZrxNi0.98 (0 ≤ x ≤ 0.48) compounds during the electrochemical cycling in aqueous KOH electrolyte has been investigated. Microstructural and chemical characterisation, mostly conducted by transmission electron microscopy, show that for all electrodes their activation results from calendar KOH corrosion. After activation, Zr substituted compounds attain much higher capacity (∼350 mAh g−1) than the binary TiNi compound (∼150 mAh g−1) but their cycle-life is poor. The mechanism of electrode degradation differs for the binary and the substituted compounds. For TiNi, degradation is due to KOH corrosion whereas, for substituted compounds, it mainly results from the loss of electrical contact due to particle pulverisation. For all electrodes, KOH corrosion produces a double surface layer formed by an inner two-phase (Ni-NiO) nanocrystalline layer and an outer (Ti,Zr)O2 amorphous layer. 相似文献