Synthesis and Compression Property of Oxidation-Resistant Ni-Al Foams  

作　　者：Wen-Wen Zeng Si-Han Hou Xiao-Jun Ding De-Li Duan Shu Li Shi-Hong Zhang 

机构地区：[1]University of Chinese Academy of Sciences [2]Institute of Metal Research,Chinese Academy of Sciences

出　　处：《Acta Metallurgica Sinica(English Letters)》2017年第10期965-972,共8页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.51275506)

摘　　要：Three different Ni-Al foams were synthesized by vapor aluminizing with control of aluminizing time. Oxidation tests under 1100 ℃ 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 from β/γ＇-phase to single β-phase as the aluminizing time extending. The Ni-Al foams possessed excellent oxidation resistance, and decreased A1 content increased oxidation weight gain and altered oxidation products. Foams containing single β-phase presented obvious brittleness under compression tests, but the foam with β/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.Three different Ni-Al foams were synthesized by vapor aluminizing with control of aluminizing time. Oxidation tests under 1100 ℃ 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 from β/γ＇-phase to single β-phase as the aluminizing time extending. The Ni-Al foams possessed excellent oxidation resistance, and decreased A1 content increased oxidation weight gain and altered oxidation products. Foams containing single β-phase presented obvious brittleness under compression tests, but the foam with β/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.

关 键 词：Ni-Al foams Vapor aluminizing OXIDATION Compression 

分 类 号：TG146.15[一般工业技术—材料科学与工程]