Synthesis and Compression Property of Oxidation-Resistant Ni–Al Foams
Synthesis and Compression Property of Oxidation-Resistant Ni–Al Foams
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DOI：
10.1007/s40195-017-0569-4
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
Wen-wen Zeng;Sihan Hou;Xiao-jun Ding;D. Duan;Shu Li;Shi-hong Zhang
中科院分区：
文献类型：
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作者：
Wen-wen Zeng;Sihan Hou;Xiao-jun Ding;D. Duan;Shu Li;Shi-hong Zhang
通过控制渗铝时间，制备了三种不同的泡沫镍铝合金。进行1100 °C下的氧化测试和压缩测试以评价泡沫的抗氧化性和压缩性能。利用X射线衍射（XRD）、扫描电镜（SEM）和能谱仪（EDS）等测试手段研究了泡沫镍铝氧化前后的物相组成和显微结构。结果表明，气相渗铝工艺没有改变泡沫的宏观和微观结构，随着渗铝时间的延长，泡沫的相组成由β/γ′相向单一的β相转变。泡沫Ni-Al具有良好的抗氧化性能，Al含量降低，氧化增重增加，氧化产物发生变化。含单一β相的泡沫在压缩试验中表现出明显的脆性，而含β/γ′相的泡沫在压缩试验中表现出一定的弹性和韧性。由于氧化过程中基体发生相变，氧化后泡沫材料的弹性和韧性得到显著提高，预氧化后的高Al含量Ni-Al泡沫材料不仅具有良好的压缩性能，而且具有优异的抗氧化性能。
Three different Ni–Al foams were synthesized by vapor aluminizing with control of aluminizing time. Oxidation tests under 1100 °C and compression tests were conducted to evaluate the oxidation resistance and compression properties of the foams. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) tests were carried out to study the phase composition and microstructure of Ni–Al foams before and after oxidation. Results showed that vapor aluminizing process did not change the foam macro- and microstructure, and the phase composition became fromβ/γ′-phase to singleβ-phase as the aluminizing time extending. The Ni–Al foams possessed excellent oxidation resistance, and decreased Al content increased oxidation weight gain and altered oxidation products. Foams containing singleβ-phase presented obvious brittleness under compression tests, but the foam withβ/γ′-phase exhibited elasticity and toughness to a certain extent. The elasticity and toughness of the foams significantly can be improved after oxidation because of the phase changing in matrix during oxidation, and the pre-oxidized high-Al-content Ni–Al foams exhibited good compression properties, as well as excellent oxidation resistance.