AZ31镁合金固态扩渗La<sub>2</sub>O<sub>3</sub>+Zn渗层组织演化过程研究

doi:10.11896/cldb.19080099

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Abstract This work aims to study the microstructural evolution of the diffusion layer and the function mechanism of La₂O₃ during the solid diffusion La₂O₃+Zn on AZ31 magnesium alloy surface. Surface solid diffusion of La₂O₃+Zn powder on AZ31 magnesium alloy was carried out at 390℃+4 h, the mass fractions of La₂O₃ in the diffusion agent was 0.0wt%, 0.2wt%, 0.4wt%, and 0.6wt%, respectively. Optical microscopy, scanning electron microscopy and X-ray diffraction were used to investigate the morphology characteristic of diffusion layer and the transformation law of phase composition with the change of La₂O₃ concentration. With the increase of La₂O₃ concentration in the diffusion agent, the microstructure of the diffusion layer was changed obviously. When there is no La₂O₃ in the diffusion agent, no diffusion layer appears on the surface of AZ31 magnesium alloy. When La₂O₃ addition was 0.2wt%, the apparent diffusion layer was observed on AZ31 magnesium alloy surface,the diffusion layer was mainly consists of Mg_0.97Zn_0.03+MgZn+Mg₂Zn₃+MgZn₂. AZ31 magnesium alloy matrix was eliminated when La₂O₃ addition exceeded 0.4wt% and the amount of phase in the layer structure no longer changes, Mg₂Zn₁₁+Mg_0.97Zn_0.03+MgZn+Mg₂Zn₃+MgZn₂ mostly existed in the diffusion layer. With the increasing La₂O₃ content in the diffusion agent, the diffusion layer microstructure becomes coarse, the amount of Mg_0.97Zn_0.03 and Mg-Zn compounds decreased and increased, respectively, the main phase in diffusion layer was MgZn. The physical diffusion model during solid diffusion La₂O₃+Zn on AZ31 magnesium alloy surface was built. The diffusion process is mainly the diffusion of Zn atoms, the diffusion mechanism of Zn on AZ31 magnesium alloy surface was vacancy diffusion. The microstructure evolution and function mechanism were analyzed with the different La₂O₃ addition in the diffusion agent, La₂O₃ acted as a catalyst during diffusion processing and improved the Zn diffusion activity ability. Under the same external diffusion conditions, La₂O₃ promoted the reaction diffusion of Zn and Mg and formed different Mg-Zn compounds.

Key words： AZ31 solid diffusion La₂O₃ Zn function mechanism physics model

Published: 12 September 2020

CLC number:

TG146.2

Fund:This work was financially supported by National Natural Science Youth Foundation Program (51701133), Sichuan Education Department Key Program (18ZA0348), Talent Introduction Program of Sichuan University of Science and Engineering (2017RCL07) and Sichuan Provincial Key Lab of Process Equipment and Control Program (GK201911), Key Laboratory Project of Comprehensive Utilization of Vanadium and Titanium Resources in Sichuan Province (2018FTSZ25).

About author:: Liyu Zhoureceived the technology bachelor degree in June 2018 from Sichuan University of Science and Engineering. He is studying for a master degree at Sichuan University of Science and Engineering since September 2018, focusing on the preparation and research of metal matrix composites and metal material surface modification.
Xiulan Li, master tutor, associate professor, engages in the teaching and scientific research at Sichuan University of Science and Engineering. Her professional fields include wear-resistant material, metal material surface modification and die material. She has published more than 50 technical papers in the domestic and foreign material journals. She took charge of 8 projects including national level, the education department of Sichuan province and key laboratory.

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Cite this article:

ZHOU Liyu,LI Xiulan,WANG Xuan, et al. Study on the Diffusion Layer Microstructure Evolution Process of AZ31 Magnesium Alloy by Solid Diffusion La₂O₃+Zn[J]. Materials Reports, 2020, 34(18): 18093-18097.

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http://www.mater-rep.com/EN/10.11896/cldb.19080099 OR http://www.mater-rep.com/EN/Y2020/V34/I18/18093

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