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Effect of secondary extrusion on the microstructure and mechanical properties of a Mg-RE alloy

机译:二次挤压对Mg-RE合金显微组织和力学性能的影响

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摘要

The effect of secondary extrusion on the microstructure and mechanical properties of a single-extruded Mg-8Gd-4Y-1Nd-0.5Zr alloy has been investigated. The microstructural results from scanning electron microscopy (SEM) show that irregular-shaped β phases in the single-extruded and pre-heated alloy are severely fragmented into small phases during secondary extrusion. Secondary extrusion increases the content of rare-earth (RE) elements in the matrix by dissolving the small phases. Transmission electron microscopy (TEM) analysis confirms that after secondary extrusion the β' strengthening phase formed during ageing is more homogeneously dispersed than that after single extrusion. Precipitate strengthening makes a dominant contribution to a high ultimate tensile strength of 428 MPa with a ductility of 2.8% after peak ageing in the secondary-extruded alloy. In particular, electron backscatter diffraction (EBSD) analysis reveals an unusual texture component after secondary extrusion in which the majority of grains distribute c-axes along the extrusion direction (ED).
机译:研究了二次挤压对单挤压Mg-8Gd-4Y-1Nd-0.5Zr合金的组织和力学性能的影响。扫描电子显微镜(SEM)的微观结构结果表明,在二次挤压过程中,单挤压和预热合金中不规则形状的β相被严重破碎成小相。二次挤压通过溶解小相增加了基质中稀土(RE)元素的含量。透射电子显微镜(TEM)分析证实,二次挤出后,时效过程中形成的β'强化相比单次挤出后更均匀地分散。二次强化合金在达到峰值时效后,析出强化对428 MPa的高极限拉伸强度和2.8%的延展性做出了主要贡献。特别地,电子背散射衍射(EBSD)分析揭示了二次挤压后不寻常的纹理成分,其中大部分晶粒沿挤压方向(ED)分布c轴。

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  • 来源
    《Materials Science and Engineering》 |2014年第20期|148-154|共7页
  • 作者单位

    School of Materials Science and Engineering, Central South University, Changsha 410083, PR China,The Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, PR China,Institute for Frontier Materials, Geelong Technology Precinct, Deakin University, Geelong, VIC 3220, Australia;

    School of Materials Science and Engineering, Central South University, Changsha 410083, PR China,The Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, PR China;

    School of Materials Science and Engineering, Central South University, Changsha 410083, PR China,The Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, PR China;

    School of Materials Science and Engineering, Central South University, Changsha 410083, PR China,The Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, PR China;

    Defense Technology R&T Center, China Aerospace Science & Industry Corporation, Beijing 100854, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Magnesium alloys; Secondary extrusion; Age hardening; Tension-compression symmetry; EBSD;

    机译:镁合金;二次挤压;时效硬化;拉压对称性;欧洲可持续发展委员会;

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