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Microstructure and mechanical properties of as-cast and extruded Mg-8Li-3Al-0.7Si alloy

铸态、挤压态Mg-8Li-3Al-0.7Si 合金组织及力学性能研究

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Abstract

Mg-8Li-3Al-0.7Si alloy was prepared by casting and deformed by hot extrusion in this study. And the microstructure of as-cast and extruded specimens was analyzed with OM, XRD, SEM and EDS. Results show that the specimens are composed of α-Mg, β-Li, AlLi, MgLiAl2 and Mg2Si phases. In as-extruded specimen, the microstructure is refined and the β-Li phase has the effect of coordination during deformation. After hot extrusion, Chinese script Mg2Si phase is crushed into block-like and distributes uniformly in the matrix. Mechanical properties results show that the strength and elongation are both improved after hot extrusion.

摘要

镁锂合金作为目前最轻的金属结构材料, 受到各国学者的广泛关注,但镁锂合金存在绝对强度 低、耐热性能差等缺点。基于此, 本文设计并制备了新型Mg-8Li-3Al-0.7Si 合金,并对其进行了热挤 压加工。本文采用光学显微镜(OM)、扫描电镜(SEM)、X 射线衍射(XRD)、EDS 能谱分析(EDS) 对合金的微观组织进行研究, 研究结果表明合金主要由α-Mg、β-Li、AlLi、MgLiAl2、Mg2Si 相组成。 与铸态合金相比,挤压态合金组织明显细化且β-Li 相表现出良好的协调变形的性能。而且, 铸态中汉 字状Mg2Si 相在挤压过后会破碎成块状,均匀地分布在基体上。力学性能测试结果表明合金在挤压过 后其强度和塑性都得到大幅度的提升。

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Authors and Affiliations

  1. School of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China

    Guo-qing Yang  (杨国庆), Xiao-dong Peng  (彭晓东), Yan Yang  (杨艳), Meng-luan Li  (李孟孪), Guo-bing Wei  (魏国兵), Hong-yan Shao  (邵红岩) & Bao Wang  (王宝)

  2. National Engineering Research Center for Magnesium Alloys, Chongqing, 400044, China

    Xiao-dong Peng  (彭晓东), Yan Yang  (杨艳) & Guo-bing Wei  (魏国兵)

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  1. Guo-qing Yang  (杨国庆)
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  2. Xiao-dong Peng  (彭晓东)
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  3. Yan Yang  (杨艳)
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  4. Meng-luan Li  (李孟孪)
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  5. Guo-bing Wei  (魏国兵)
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  6. Hong-yan Shao  (邵红岩)
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  7. Bao Wang  (王宝)
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Corresponding authors

Correspondence to Xiao-dong Peng  (彭晓东) or Yan Yang  (杨艳).

Additional information

Foundation item: Project(51601024) supported by the National Natural Science Foundation, China; Projects(2016YFB0700403, 2016YFB0301100) supported by the National Key Research and Development Program of China; Project(cstc2016jcyjA0418) supported by the Chongqing Research Program of Basic Research and Frontier Technology, China; Project(106112016CDJXZ138811) supported by the Fundamental Research Funds for the Central Universities, China

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Yang, Gq., Peng, Xd., Yang, Y. et al. Microstructure and mechanical properties of as-cast and extruded Mg-8Li-3Al-0.7Si alloy. J. Cent. South Univ. 25, 764–771 (2018). https://doi.org/10.1007/s11771-018-3781-0

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  • DOI: https://doi.org/10.1007/s11771-018-3781-0

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