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首页> 外文期刊>Materials Science and Engineering >Compressive creep behavior of extruded Mg-4Sm-2Yb-0.6Zn-0.4Zr alloy
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Compressive creep behavior of extruded Mg-4Sm-2Yb-0.6Zn-0.4Zr alloy

机译：挤出MG-4SM-2YB-0.6ZN-0.4ZR合金的压缩蠕变行为

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摘要

A high-strength Mg-4Sm-2Yb-0.6Zn-0.4Zr extruded alloy with bimodal microstructure was creep tested in compression at temperatures of 200 °C and 225°C under applied stress in the range of 120-200 MPa. The creep curves of the alloy are dominated by a steady-state creep stage and a transient primary creep stage. An abnormal decrease of creep rate is observed in the later period of the steady-state creep stage, particularly the creep at high stress levels more significant, and the underlying reasons are proposed. Moreover, the alloy exhibits high stress exponents (n = 8.7 at 200°C and n = 7.4 at 225 °C) and activation energies ranging from 225 kJ/mol to 310 kJ/ mol. It is shown that the high stress exponents can be well rationalized by the commonly adopted threshold stress method in this work, which results in the modified stress exponents near 5, suggesting five power law, with some indicator of dislocation creep. Transmission electron microscopic observations revealed that cross-slip of dislocations is the dominant creep mechanism in recrystallized grains, while cross-slip of dislocations is operative in hot-worked grains. Besides, a fraction of γ" phase in hot-worked regions was transformed to γ' phase during creep while not in recrystallized regions, thus coexistence of γ" and γ' in hot-worked regions. Also, these γ-typed phases play an important role in creep of the studied alloy. Finally, the studied alloy owns better creep resistance than those of benchmark Mg alloys such as AE and AX series alloys.
机译：高强度Mg-4SM-2YB-0.6ZN-0.4ZR挤出合金，具有双峰组织的抗蠕动在200℃和225℃的温度下在施加的应力下在120-200MPa的温度下进行蠕动。合金的蠕变曲线由稳态蠕变阶段和瞬态蠕变阶段主导。在稳态蠕变阶段的后期观察到蠕变率的异常降低，特别是高应力水平的蠕变更显着，提出了基本原因。此外，该合金在高应力指数（在225℃下在200℃和N = 7.4时显示高应力指数（n = 8.4），并从225kj / mol到310kj / mol的激活能量。结果表明，高应力指数可以通过这项工作中的通常采用的阈值应力方法进行很好的合理化，这导致修改的应力指数附近5，暗示了五个电力法，一些位错蠕变的指标。透射电子显微镜观察显示，脱位的交叉滑移是重结晶晶粒中的主要蠕变机制，而脱臼的交叉滑动是在热工作的晶粒中操作。此外，在蠕变期间，在蠕变期间将γ“相中的γ”相的相移转变为γ'相，而不是在再结晶区域中，因此在热工作区域中的γ“和γ”的共存。此外，这些γ型相位在研究的合金的蠕变中起重要作用。最后，所研究的合金拥有比基准Mg合金，如AE和AX系列合金所拥有更好的抗蠕变性。

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  • 来源
    《Materials Science and Engineering》 |2021年第30期|140929.1-140929.10|共10页
  • 作者

    Dongdong Zhang; Shuo Yang; Fanzhi Meng; Zheng Tian; Hong Xu; Zhanyi Cao; Jian Meng;

  • 作者单位

    Key Laboratory of Automobile Materials of Ministry of Education College of Materials Science and Engineering Nanling Campus Jilin University Changchun 130025 PR China State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 PR China;

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

    School of Materials Science and Engineering Changchun University of Science and Technology 130022 PR China;

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

    Key Laboratory of Automobile Materials of Ministry of Education College of Materials Science and Engineering Nanling Campus Jilin University Changchun 130025 PR China;

    Key Laboratory of Automobile Materials of Ministry of Education College of Materials Science and Engineering Nanling Campus Jilin University Changchun 130025 PR China;

    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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  • 正文语种 eng
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  • 关键词

    Magnesium alloy; Creep mechanism; Bimodal microstructure; Dislocation; Precipitation;

    机译：镁合金;蠕变机制;双峰组织;错位;沉淀;

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