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首页> 外文期刊>Materials Science and Engineering >Improving microstructure and ductility in the Mg-Zn alloy system by combinational Ce-Ca microalloying
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Improving microstructure and ductility in the Mg-Zn alloy system by combinational Ce-Ca microalloying

机译：Ce-Ca微合金组合改善Mg-Zn合金系统的显微组织和延展性

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摘要

A strategy is proposed to enhance the microstructure and mechanical properties of Mg-Zn alloys by combining microalloying additions of the rare earth element Ce and the non-rare earth element Ca. The double additions of Ce-Ca are found to significantly increase tensile elongation compared to binary Mg-Zn, or single additions of either Ce or Ca. Microstructure analysis reveals that the Ce-Ca additions increase ductility by modifying texture and refining grain size. Texture modification is attributed to solute effects from the microalloying elements, particularly Ca, while grain refinement is additionally influenced by a fine dispersion of Mg_6Ca_2Zn_3 precipitates that form during rolling and pin grain boundaries. The microalloying element additions also lead to large secondary phase particles in the alloys, which can limit ductility enhancement by promoting early fracture. By scaling Zn content in the Mg-Zn-Ce-Ca alloys, the Mg_6Ca_2Zn_3 phase fraction and Zn solute content can be controlled for optimum ductility or strengthening potential.
机译：提出了通过结合稀土元素Ce和非稀土元素Ca的微合金添加来增强Mg-Zn合金的组织和力学性能的策略。与二元Mg-Zn相比，Ce-Ca的双添加或单添加Ce或Ca可以显着提高拉伸伸长率。微观结构分析表明，添加Ce-Ca可以通过改变织构和细化晶粒尺寸来提高延展性。纹理修饰归因于微合金元素（特别是Ca）的溶质效应，而晶粒细化还受Mg_6Ca_2Zn_3沉淀物在轧制和销钉晶界形成的精细分散的影响。添加微合金元素还会导致合金中出现大量次级相颗粒，这会通过促进早期断裂而限制延展性的提高。通过缩放Mg-Zn-Ce-Ca合金中的Zn含量，可以控制Mg_6Ca_2Zn_3相分数和Zn溶质含量，以实现最佳延展性或增强潜力。

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  • 来源
    《Materials Science and Engineering》 |2015年第3期|76-84|共9页
  • 作者

    B. Langelier; A.M. Nasiri; S.Y. Lee; M.A. Gharghouri; S. Esmaeili;

  • 作者单位

    Department of Mechanical & Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Ontario, Canada N2L 3G1;

    Department of Mechanical & Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Ontario, Canada N2L 3G1;

    Department of Materials Science and Engineering, Chungnam National University, Daejeon 305-764, South Korea;

    Canadian Neutron Beam Centre, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0;

    Department of Mechanical & Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Ontario, Canada N2L 3G1;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Magnesium alloy; Mechanical properties; Microalloying; Texture;

    机译：镁合金机械性能微合金化;质地;

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