PM synthesis and properties of steel foams
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Synthesis and properties of open-celled metal foams
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 from /′-phase to single-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 single -phase presented obvious brittleness under compression tests, but the foam with /′-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.
Zeng Wen-Wen, Hou Si-Han, Ding Xiao-Jun, Duan De-Li, Li Shu, Zhang Shi-Hong. Synthesis and Compression Property of Oxidation-Resistant Ni-Al Foams. Acta Metallurgica Sinica(English letters), 2017, 30(10): 965-972.
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This work is supported by the National Science Foundation4:25 pm INVITEDSYNTHESIS, STRUCTURE AND PROPERTIES OF Cu/Nb NANOLAYERED COMPOSITES:
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