Preparation and Microstructure of FeCr-ODS Ferrite Alloy Fabricated by Oxidation and Powder Forging

doi:10.11901/1005.3093.2021.150

Chinese Journal of Materials Research

2022, Vol. 36

Issue (6): 461-470 DOI: 10.11901/1005.3093.2021.150

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Preparation and Microstructure of FeCr-ODS Ferrite Alloy Fabricated by Oxidation and Powder Forging

YAN Fuzhao¹^,², LI Jing¹, XIONG Liangyin¹, LIU Shi¹(

)

^1.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

YAN Fuzhao, LI Jing, XIONG Liangyin, LIU Shi. Preparation and Microstructure of FeCr-ODS Ferrite Alloy Fabricated by Oxidation and Powder Forging. Chinese Journal of Materials Research, 2022, 36(6): 461-470.

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Abstract

FeCr-ODS ferrite alloy was fabricated via a novel fabrication process of pre-oxidation treatment followed by powder forging proposed by the authors. The prepared alloy was characterized by means of SEM, XPS, EPMA and TEM techniques in terms of the generation, evolution of oxides on the surface and interior of the powder, as well as the type and distribution of oxide nanoparticles in the fabricated ODS ferrite alloy. The results show that an iron oxide film formed on the surface of powders during low temperature oxidation. By the subsequent heating process, the iron oxide could react with Y and Ti to form complex oxide Y-Ti-O nanoparticles. The evolution of oxide dispersoids during the course of fabrication was characterized to clarify the contribution of powder forging to dislocations and nanoscale precipitates. Fine Y₂TiO₅ nanoparticles uniformly distributed in the matrix, and a small number of Y₂O₃ particles aligned along the grain boundaries by this manufacturing method.

Key words: synthesizing and processing technics for materials FeCr-ODS ferrite alloy powder forging Y-Ti-O nanoparticles formation mechanism microstructure

Received: 25 February 2021

ZTFLH:

TB331

About author: LIU Shi, Tel: (024)23971470, E-mail: sliu@imr.ac.cn

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	Fuzhao YAN
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https://www.cjmr.org/EN/10.11901/1005.3093.2021.150 OR https://www.cjmr.org/EN/Y2022/V36/I6/461

Table 1 Chemical composition of the atomized powder (mass fraction, %)

Fig.1 SEM results of oxidized powder surface: (a) powder surface morphology (low magnification), (b) powder surface morphology (high magnification), (c) line scanning results in Fig.1b

Table 2 EDS of different points on powder surface (mass fraction, %)

Fig.2 Distribution of elements on the cross-section of oxidized powder (a) BSE image, (b) Fe, (c) Cr, (d) Y, (e) Ti, (f) O

Fig.3 AES depth profile of surface chemical composition of the oxidized powder

Fig.4 High-resolution XPS spectra of Fe (a), Cr (b), Y (c) and Ti (d) on the surface of oxidized powder at different etch depth

Fig.5 SEM image of the powder surface after heating to 1150℃

Table 3 EDS of different points on the powder surface after heating to 1150℃ (mass fraction, %)

Fig.6 Distribution of elements on the cross-section of oxidized powder after heating to 1150℃ (a) BSE image, (b) Fe, (c) Cr, (d) Y, (e) Ti, (f) O

Fig.7 AES depth profile of surface chemical composition of the oxidized powder after heating to 1150℃

Fig.8 High-resolution XPS spectra of Fe (a), Cr (b), Y (c) and Ti (d) on the surface of oxidized powder after heating to 1150℃ at different etch depth

Fig.9 Metallographic image of the alloy obtained by powder forging

Fig.10 TEM results of the alloy (a) nanoparticles distribution in the grain, (b) nanoparticles distribution near the grain boundary, (c) particle size distributions of dispersoids in the alloy

Fig.11 Configuration between dislocations and oxide nanoparticles in the alloy

Fig.12 Mapping results of precipitates in the alloy

Fig.13 TEM/HRTEM results of different precipitates in the alloy (a) SAED pattern of large particle in the alloy, (b) HRTEM image of small particle in the alloy, (c) corresponding FFT pattern of small particle

Table 4 Inter-planar spacing (d) and angles (α) of small particle and the possible indexing

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