Al2O3 NANOPARTICLE AND NiAl REINFORCED Fe-BASED ODS ALLOYS SYNTHESIZED BY THERMITE REACTION

Acta Metall Sin

2015, Vol. 51

Issue (7): 791-798 DOI:

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Al₂O₃ NANOPARTICLE AND NiAl REINFORCED Fe-BASED ODS ALLOYS SYNTHESIZED BY THERMITE REACTION

Yue CUI,Wenjun XI(

),Xing WANG,Shujie LI

School of Materials Science and Engineering, Beihang University, Beijing 100191

Cite this article:

Yue CUI,Wenjun XI,Xing WANG,Shujie LI. Al₂O₃ NANOPARTICLE AND NiAl REINFORCED Fe-BASED ODS ALLOYS SYNTHESIZED BY THERMITE REACTION. Acta Metall Sin, 2015, 51(7): 791-798.

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Abstract

Fe-based oxide dispersion strengthened (ODS) alloys are widely used in advanced aircrafts and gas turbine engines due to their good high temperature strength, creep properties and hot-corrosion resistance. Traditionally, ODS alloys are prepared by internal oxidation and mechanical alloying. However, internal oxidation cannot be applied to multi-component alloys. It is difficult to guarantee other elements from being oxidized. On the other hand, the use of mechanical alloying will bring in impurities in the process of ball milling which will compromise the purification of alloy particles surface. In this work, TiO₂ xerogel prepared by using sol-gel method was added to the thermite powder mixture and the mixture was then ignited by using a tungsten filament. It solidified rapidly after the molten metal flowed into the bottom of the graphite mold because of the gravity field. It was found that Al₂O₃ and NiAl were formed in situ in the molten metal. Therefore, Al₂O₃ nanoparticles and NiAl reinforced Fe-based ODS alloy could be prepared by using this method. The phase composition and morphology of the Fe-based ODS alloy were investigated by using the combination of OM, SEM, TEM, XRD. The size of Al₂O₃ nanoparticles and the influence of Brownian motion and interface energy on the distribution and movement of the Al₂O₃ nanoparticles were investigated. The mechanical properties of the Fe-based ODS alloy with different contents of TiO₂ xerogel was investigated by using mechanical properties testing machine. The experimental results show that the Fe-based ODS alloy consists of ferrite a-FeNiCrAl, NiAl, and Al₂O₃ nanoparticles. The diameter of Al₂O₃ nanoparticles is approximately 10 nm. Both Brownian motion and interface energy affect the motion of Al₂O₃ nanoparticles during the solidification, however, interface energy is dominant. The interface energy between Al₂O₃ nanoparticles and NiAl is lower than that of Al₂O₃ and ferrite a-FeNiCrAl. Therefore, nearly all the Al₂O₃ nanoparticles are connected with the NiAl phase. Higher TiO₂ xerogel additions increase the tensile strengthen and elongation of the Fe-based ODS alloy. When the content of TiO₂ xerogel is 1.24%, the tensile strength of the Fe-based ODS alloy attains 849 MPa and the elongation is 13%. Continuing adding the TiO₂ xerogel results in the release of large quantities of gas which produces holes in the Fe-based ODS alloy and these holes decrease the mechanical properties of the alloy.

Key words: Al₂O₃ nanoparticle interfacial energy tensile property oxide dispersion strengthened alloy

Fund: Supported by National Natural Science Foundation of China (No.51472015)

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	Yue CUI
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Table 1 Chemical composition of experimental thermite

Fig.1 Schematic of the thermite reaction setup

Fig.2 Sketch of tensile sample (unit: mm)

Fig.3 OM images of Fe-based oxide dispersion strengthened (ODS) alloy synthesized by thermite reaction process with TiO₂ xerogel contents of 0 (a), 0.87% (b), 1.24% (c) and 1.98% (d)

Fig.4 XRD spectrum of Fe-based ODS alloys synthesized by thermite reaction process with addition of 0.87%TiO₂ xerogel

Fig.5 SEM images of Fe-based ODS alloys synthesized by thermite reaction process with addition of 0 (a, b), 0.87% (c, d), 1.24% (e, f) and 1.98% (g, h) TiO₂ xerogel at low (a, c, e, g) and high (b, d, f, h) magnification

Fig.6 TEM images (a, d) and SAED patterns (b, c, e) of Fe-based ODS alloy synthesized by thermite reaction process with addition of 0.87%TiO₂ xerogel in dendrite (a, b), base (c) and interdendritic (d, e) regions (Figs.6b, c and e correspond to the SAED patterns of rectangle areas 1, 2 in Fig.6a and rectangle area in Fig.6d, respectively )

Fig.7 Stress-strain curves for Fe-based ODS alloys synthesized by thermite reaction process with different contents of TiO₂ xerogel addition

Fig.8 Effect of different contents of TiO₂ xerogel on tensile strength and elongation for Fe-based ODS alloys synthesized by thermite reaction process

Fig.9 SEM images of fractographs of Fe-based ODS alloys synthesized by themite reaction process with addition of 0 (a), 0.87% (b), 1.24% (c) and 1.98% (d) TiO₂ xerogel

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