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Microstructures and mechanical properties of a commercial Mg–Al–Zn–Mn alloy with various hot-extrusion processes

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通过采用差温挤压(DTE)工艺和传统的等温挤压(ITE)工艺制备了Mg-6Al-1Zn-0.15Mn wt% (AZ61)商业合金。显微组织表征表明，DTE工艺促进了AZ61合金晶粒细化(~0.8 μm)和Mg17Al12动态析出。此外，降低模具温度可以提高动态再结晶(DRXed)晶粒的体积分数。通过比较力学性能发现，模具温度130℃下挤压成形的合金具有较高的强度。在极限抗拉强度~400 MPa、拉伸屈服强度~350 MPa的情况下，合金的断裂伸长率依然可达~10%。此外，在DTE样品中观察到较高的位错密度，特别是在未再结晶区域，并且基于透射电子显微镜(TEM)观察证实这些位错为<a>型。结果表明，高强度来源于更细的DRXed晶粒、更高的DRXed区域体积分数、更高的位错密度以及动态析出相强化，DTE工艺具有应用于多种镁合金体系的潜力，并且易于获得高强度AZ61合金。

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Acknowledgements

This work was financially supported by the Projects for Science and Technology of Jilin Province (Nos. 20210402064GH and 20220402012GH), the National Natural Science Foundation of China (No. U21A20323), the Capital Construction Fund within the Budget of Jilin Province (No. 2023C044-2), the Special High-Tech Industrialization Project of Science and Technology Cooperation between Jilin Province and Chinese Academy of Sciences (No. 2021SYHZ0043), the Major science and technology projects of Jilin Province and Changchun City (No. 20210301024GX) and the Project for Jilin provincial department of education (No. JJKH20220760KJ).

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Authors and Affiliations

  1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    He Ma, Qiang Yang, Ze-Feng Xie & Xin Qiu

  2. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China

    He Ma, Fan-Zhi Meng & Ze-Feng Xie

  3. MagIC-Magnesium Innovation Center, Helmholtz-Zentrum Geesthacht, 21502, Geesthacht, Germany

    Yuan-Ding Huang

  4. Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun University of Science and Technology, Changchun, 130022, China

    He Ma & Fan-Zhi Meng

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Ma, H., Meng, FZ., Yang, Q. et al. Microstructures and mechanical properties of a commercial Mg–Al–Zn–Mn alloy with various hot-extrusion processes. Rare Met. 43, 1329–1336 (2024). https://doi.org/10.1007/s12598-023-02522-7

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