钛镍合金
多孔性
材料科学
相(物质)
作文(语言)
冶金
复合材料
形状记忆合金
化学
语言学
哲学
有机化学
作者
Gulsharat Baigonakova,Екатерина Марченко,Oibek Mamazakirov,Alex A. Volinsky
标识
DOI:10.1016/j.apt.2024.104395
摘要
NiTi samples with 59–70% porosity were obtained by the self-propagating high-temperature synthesis (SHS) using Ti, Ni, and NiTi powders as inert. The maximum and average pore sizes increase, while the maximum and average dimensions of the bridges decrease with porosity, controlled by adjusting the amount of inert additives, based on the surface and cross-sectional microscopy studies. The phase composition of porous NiTi was determined by X-ray diffraction. The alloy contains an austenitic B2 TiNi phase, a martensitic B19′ TiNi phase, and a secondary Ti2Ni phase. SHS-NiTi samples with different porosity were tested by uniaxial compression, revealing mechanical properties' dependence on porosity. It is shown that with an 11% increase in the NiTi alloy porosity, the yield and compressive strength are reduced by almost a factor of 2.
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