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采用高温固相扩散处理对开孔泡沫Fe-Ni进行合金化,研究了不同处理温度,不同保温时间对泡沫Fe-Ni压缩性能及能量吸收特性的影响。采用扫描电镜(SEM)对合金化后的泡沫Fe-Ni进行形貌观察,并利用线扫描分析合金化前后两种元素的扩散情况;对合金化前后的泡沫Fe-Ni进行了纳米压痕试验和准静态压缩试验,研究了泡沫Fe-Ni网丝硬度、准静态压缩力学行为及其吸能性。结果表明:经高温固相扩散处理后,泡沫Fe和Ni镀层界面上发生了Fe-Ni的互扩散,形成(Fe,Ni)无限固溶体结构;随着温度升高,保温时间增长,Fe、Ni元素分布更趋于均匀化,泡沫Fe-Ni网丝平均纳米硬度值更高。1200℃高温固相扩散2h后泡沫Fe-Ni平台区应力值增加,平台区长度增加。泡沫Fe-Ni吸能能力整体趋势随应变的增加而线性增大。其中,1200℃高温固相扩散保温2h,泡沫Fe-Ni能量吸收值比合金化前提高了31.9%。
The high-temperature solid-state diffusion treatment was used to alloy the open-cell foam Fe-Ni. The effects of different treatment temperature and holding time on the compressive properties and energy absorption properties of the foamed Fe-Ni foam were studied. Morphology of the foamed Fe-Ni alloy was observed by scanning electron microscopy (SEM), and the diffusion of the two elements before and after alloying was analyzed by line scanning. The nano-indentation test was performed on the foamed Fe-Ni before and after alloying And quasi-static compression tests were carried out to study the hardness, quasi-static compressive mechanical behavior and energy absorption of foamed Fe-Ni mesh. The results show that the interfacial diffusion of Fe-Ni occurs at the interface between the foamed Fe and Ni coatings and the (Fe, Ni) infusible solid solution structure is formed after the high temperature solid-state diffusion treatment. As the temperature increases, the holding time increases, Elemental distribution tends to be more uniform, the average nano-hardness of foamed Fe-Ni mesh is higher. After 1200h high temperature solid phase diffusion 2h, the stress of foam Fe-Ni plateau increased and the length of plateau increased. The overall trend of foam Fe-Ni energy absorption increases linearly with strain. Among them, solid-state diffusion at high temperature of 1200 ℃ for 2h, the energy absorption value of foamed Fe-Ni was 31.9% higher than that before alloying.