Precipitation and Strengthening Mechanism of Al-Zn-Mg-Cu Alloy Under Controllable Electromagnetic Energy (CEME) Aging Treatment
BAI Qingwei1,2, MA Yonglin2, XING Shuqing2, YU Wenxia2, CHEN Zhongyi2
1 School of Material and Metallurgy(School of Rare Earth), Inner Mongolia University of Science & Technology, Baotou 014010, China 2 Key Laboratory of Comprehensive Utilization of Polymetallic Resources of Bayan Obo Mine, Inner Mongolia Autonomous Region, Baotou 014010, China
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.
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2021, Vol. 35 
