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

doi:10.1007/s40195-017-0569-4

Abstract

Abstract:

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 β/γ′-phase to single β-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 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.

Key words: Ni-Al foams, Vapor aluminizing, Oxidation, Compression

Wen-Wen Zeng, Si-Han Hou, Xiao-Jun Ding, De-Li Duan, Shu Li, Shi-Hong Zhang. Synthesis and Compression Property of Oxidation-Resistant Ni-Al Foams[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(10): 965-972.

Figures/Tables 11

Fig. 1 Structures and sectional micrographs before a, c, after b, d aluminization

Table 1 Aluminizing time and weight gain of the three Ni-Al foams used in this study

	Aluminizing time (min)	Average weight gain (%)	Average Al atomic percentage (%)
Foam A	30	45.0 ± 2.0	49.4
Foam B	25	40.7 ± 1.4	46.9
Foam C	20	34.7 ± 0.7	43.0

Fig. 2 XRD patterns of aluminized foams

Fig. 3 Sectional backscattered electron image of foam C

Fig. 4 Kinetics of oxidation weight gain of the original and Ni-Al foams

Fig. 5 XRD patterns of the oxidized foam A a, B b, C c

Fig. 6 Sectional backscattered electron images of the oxidized foam A a, B b, C c

Fig. 7 EDS line-scan of the oxidation film on the inner surface of foam B

Fig. 8 SSCs of the original and Ni-Al foams

Fig. 9 Typical fracture appearance of foam A a, C b

Fig. 10 SSCs of the oxidized Ni-Al foams

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