可控电磁能(CEME)时效处理下Al-Zn-Mg-Cu合金的析出及强化机理研究

doi:10.11896/cldb.20090061

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Abstract Pulsed electromagnetic fields could induce controlled electromagnetic energy (CEME). Auxiliary aging treatment of Al-Zn-Mg-Cu alloy was performed by pulsed electromagnetic field. The effects of pulsed electromagnetic field on the precipitation density, size distribution and mechanical properties were investigated, and the mechanism of microstructure strengthening was analyzed. The magnetic-thermal diffusion model and quantum mechanics were introduced to explore the evolution of precipitation phase under pulsed magnetic energy. The results showed that the number of precipitated particles increases under the pulsed electromagnetic field, while prolonged aging time promotes the growth of the precipitated phase. The density of the precipitated phase is 1.124 μm^-2 after pulsed electromagnetic field aging for 1 h, which is about three times the traditional aging 12 h. The strengths of aged Al-Zn-Mg-Cu alloy are 506 MPa and 542 MPa, respectively. The strengthening mechanism of precipitation changes from coherent strain field strengthening mechanism (CS) transitions to the Orowan by pass strengthening model (OS) with the increase of the precipitate size, and the theoretical critical precipitate size is 20 nm. The kinetic analysis indicates that the electromagnetic energy almost has no effect on the diffusion activation energy, and increasing the atomic vibration frequency is the main reason for increasing the number of precipitated particles.

Key words： precipitation strengthening electromagnetic energy magnetic-thermal diffusion model Larmor frequency

Published: 12 November 2021

CLC number:

TF821

Fund:Natural Science Foundation of Inner Mongolia Autonomous Region (2020BS05021,2018MS05008), the Inner Mongolia University of Science and Technology Innovation Fund Project (2019QDL-B16), Inner Mongolia Major Basic Research Open Project (0406091701) and Inner Mongolia Autonomous Region Science and Technology Planning Project(2021GG0095) and China Scholarship Council(201708150077).

Corresponding Authors: abcqingwei@163.com; malin@imust.cn

About author:: Qingwei Bai received his Ph.D. degree in metallurgy engineering materials science and engineering from the CNRS/ Universite Grenoble Alpes, SIMAP/EPM & Inner Mongolia University of Science and Technology Sep. 2015—Dec. 2018. He is currently a lecturer of the Inner Mongolia University of Science and Technology. He has published more than 20 journal papers as the first author, applied 6 national patents. In addition, he is also a reviewer of several academic journals. His research interests focus on the electromagnetic metallurgy and material electromagnetic process, involving the phase transformation behavior of materials and the numerical simulation of metallurgical process under microwave radiation/pulsed electromagnetic field.
Yonglin Ma, professor of Inner Mongolia University of Science and Technology, he is currently a professor and doctoral supervisor enjoying the special allowance from the State Council. His received his Ph.D. degree in material processing from Northeastern University. He performed collaborative research in 2007—2008 in Royal Swedish Institute of Technology (KTH). He has published more than 200 papers in academic journals and applied for more than 20 patents. His team’s main research interests include: the mechanism research and application of electromagnetic energy nucleation of low melting point alloy; research and development of electromagnetic pumping system of low melting point alloy. Dozens of scientific research and technical cooperation projects have been carried out, and many projects have been appraised by experts and applied in industry. The projects completed and being undertaken includes: the International Cooperation Project of the Ministry of Science and Technology, the National Major Project of Science and Technology, the supporting project of the Ministry
of Industry and Information Technology, the National Natural Science Foundation of China. Meanwhile, it has cooperated with some enterprises, state key laboratories and foreign professors for many projects. He has trained 7 doctors and more than 20 masters.

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Cite this article:

BAI Qingwei,MA Yonglin,XING Shuqing, et al. Precipitation and Strengthening Mechanism of Al-Zn-Mg-Cu Alloy Under Controllable Electromagnetic Energy (CEME) Aging Treatment[J]. Materials Reports, 2021, 35(20): 20143-20148.

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http://www.mater-rep.com/EN/10.11896/cldb.20090061 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20143

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