Effect of Interfacial Energy on Distribution of Nanoparticle in the Melt During the Preparation of Fe-Based ODS Alloys by Thermite Reaction

doi:10.11900/0412.1961.2016.00438

Acta Metall Sin

2017, Vol. 53

Issue (8): 1011-1017 DOI: 10.11900/0412.1961.2016.00438

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Effect of Interfacial Energy on Distribution of Nanoparticle in the Melt During the Preparation of Fe-Based ODS Alloys by Thermite Reaction

Jianxue LIU, Wenjun XI(

), Neng LI, Shujie LI

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

Cite this article:

Jianxue LIU, Wenjun XI, Neng LI, Shujie LI. Effect of Interfacial Energy on Distribution of Nanoparticle in the Melt During the Preparation of Fe-Based ODS Alloys by Thermite Reaction. Acta Metall Sin, 2017, 53(8): 1011-1017.

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Abstract

Fe-based oxide dispersion strengthened (ODS) alloys are conventionally manufactured through mechanical alloying. Such route even involves an expensive milling step but the oxide surface still could not avoid being contaminated. This work developed a new method by combination of thermite reaction and rapid solidification (RS) to prepare ODS alloys. Attributing to the optimization of thermite mixture composition, nanoparticle α-Al₂O₃ was synthetized in situ and the molten alloy was modulated by spinodal decomposition (SD) into Fe, Cr-rich and Ni, Al-rich regions. During the cooling of the melt, the low interfacial energy between α-Al₂O₃ and Ni, Al-rich region was also considered in the process for nanoparticles α-Al₂O₃ to assemble into NiAl, thus they could uniformly distribute in matrix. This work focuses on the thermodynamic analysis of SD in the melt alloy and the speed of the nanoparticles α-Al₂O₃ under the influence of interfacial energy and Brownian motion. Experiment results shows that the spherical NiAl segregated by SD has a mean diameter of about 50 nm, whose volume fraction reaches up to 50%; and nanoparticle α-Al₂O₃, formed during thermite reaction, has a diameter of 5 nm combined into NiAl under the influence of interfacial energy. Computation results indicate that, driven by interfacial energy and Brownian motion, nanoparticle α-Al₂O₃ could move fast enough into Ni, Al-rich region before solidification accomplishes during RS. Test results imply that the tensile strength of Fe-based ODS alloy is 602 MPa with ultimate elongation of 21% and its mass gain under 1000 ℃ in air for 100 h is 0.4 mg/cm².

Key words: Fe-based ODS alloy interfacial energy liquid spinodal decomposition nanoparticle Al2O3 NiAl phase

Received: 05 October 2016

ZTFLH:

TG148

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

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00438 OR https://www.ams.org.cn/EN/Y2017/V53/I8/1011

Fig.1 Schematic of the thermite reaction setup

Fig.2 XRD spectrum of Fe-based oxide dispersion strengthened (ODS) alloy synthesized by thermite reaction process

Fig.3 Low (a) and high (b) magnified TEM images, HRTEM image (c) and SAED pattern (d) of Fe-based ODS alloys synthesized by thermite reaction process

Fig.4 Schematic of simplified motion diagram of nanoparticle Al₂O₃

Table 1 Tensile strength and mass gain after oxidation of Fe-based ODS alloy synthesized by thermite reaction process with respect to some commercial ODS alloys

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