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首页> 外文期刊>Materials Science and Engineering >High temperature mechanical behavior of an extruded Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy
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High temperature mechanical behavior of an extruded Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy

机译：Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr（wt％）合金的高温力学性能

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摘要

The microstructure-property relation of an extruded Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy was investigated by conducting hot compression and high temperature creep at temperatures upto 250 ℃. The alloy exhibits an average compressive yield strength (σ_(CYS)) of 363 ± 1 MPa and an average elongation to failure (ε_(CF)) of 10.5 ± 0.2% at room temperature, 301 ± 13 MPa and 12.8 ± 1.1% at 200 ℃. In creep the minimum creep strain rate (ε_(min)) is 1.94 × 10~(-9) s~(-1) at 175℃/160MPa and 6.67 × 10~(-9) s~(-1) at 200 ℃/ 100 MPa. The obtained stress exponent n is in the range of 3.7-4.7, suggesting that the creep is controlled by the dislocation climb mechanism. The improvement in compressive strength and creep resistance is attributed to the fine recrystallized grains, SFs in the grain interior, Mg_5RE and LPSO phases at grain boundaries. The alloy exhibits a bimodal texture with 〈0001〉 and 〈1010〉 components. Its strengthening effect is determined by the competition between these two texture components. In compressive deformation, the textural evolution from 〈1010〉 to 〈0001〉 is mainly attributed to the operation of basal 〈a〉 slip and {1012}〈1011〉 tensile twinning. This texture evolution is not seen in creep.
机译：通过在高达250℃的温度下进行热压缩和高温蠕变，研究了挤压Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr（wt％）合金的组织与性能的关系。该合金在室温下的平均抗压屈服强度（σ_（CYS））为363±1 MPa，在室温下的平均破坏伸长率（ε_（CF））为10.5±0.2％，在室温下为301±13 MPa和12.8±1.1％ 200℃。蠕变时的最小蠕变应变率（ε_（min））在175℃/ 160MPa时为1.94×10〜（-9）s〜（-1）在200°C时为6.67×10〜（-9）s〜（-1） ℃/ 100 MPa。所获得的应力指数n在3.7-4.7范围内，表明蠕变受位错爬升机制控制。抗压强度和抗蠕变性的提高归因于细的重结晶晶粒，晶粒内部的SFs，晶界处的Mg_5RE和LPSO相。合金表现出具有<0001>和<1010>组分的双峰织构。其增强效果取决于这两个纹理成分之间的竞争。在压缩变形中，从〈1010〉到〈0001〉的组织演变主要归因于基底〈a〉滑动和{1012} 〈1011〉拉伸孪生的作用。在蠕变中看不到这种纹理演变。

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  • 来源
    《Materials Science and Engineering》 |2015年第1期|213-224|共12页
  • 作者

    Zijian Yu; Yuanding Huang; Hajo Dieringa; Chamini Lakshi Mendis; Renguo Guan; Norbert Hort; Jian Meng;

  • 作者单位

    State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China,Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str, 1, d-21502 Geesthacht, Germany,University of Chinese Academy of Sciences, Beijing 100049, PR China;

    Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str, 1, d-21502 Geesthacht, Germany;

    Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str, 1, d-21502 Geesthacht, Germany;

    Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str, 1, d-21502 Geesthacht, Germany;

    School of Materials and Metallurgy, Northeastern University, 3-11 Wenhua Road, Shenyang 110004, PR China;

    Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str, 1, d-21502 Geesthacht, Germany;

    State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China;

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  • 关键词

    Magnesium alloys; Compressive deformation; Creep; Hot extrusion; Precipitation;

    机译：镁合金;压缩变形;蠕变;热挤压;沉淀;

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