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Strong stress-level dependence of creep-ageing behavior in Al-Cu-Li alloy

机译：Al-Cu-Li合金中蠕变老化行为的强应力水平依赖性

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摘要

The creep responses, mechanical properties and microstructure evolution in an Al-Cu-Li alloy creep-aged under different stress levels have been systematically investigated by creep test, tensile test and high-angle annular dark-field scanning transmission electron microscopy. When the applied stress is lower than the yield strength, the creep deformation exhibits a four-stage behavior with double primary creep. For high-stress-aged samples, the alloys experience an unusual rapid strain increase at the initial holding stage and then exhibit a normal two-stage creep behavior. The stress-exponent analysis indicates the creep mechanism changes from diffusion creep to dislocation climbing with the stress exceeding the yield strength. The apparent preferential alignment of δ′/θ′/δ′ composite precipitates (stress-orienting effect) can be frequently observed in the low-stress-aged samples and is demonstrated to be responsible for the reduced precipitation strengthening potential compared to the stress-free-aged sample. The high-stress-loading induced dislocations result in a considerable increase of both the creep response and mechanical strength. The unusual strain increase is ascribed to the inelastic deformation caused by softening (material strength lower than the holding stress) due to dislocation recovery and solute clusters reversion within a short-time interval. The dislocation hardening compensates the softening induced by the stress-orienting effect of both T_1 and δ′/θ′/δ′ composite precipitates in the high-stress-aged samples. Our results reveal the microstructural factors sensitive to the stress-level during both the stress-loading and holding stages determine the stress-level dependent creep-ageing response in Al-Cu-Li alloy.
机译：通过蠕变试验，拉伸试验和大角度环形暗场扫描透射仪系统地研究了在不同应力水平下的Al-Cu-Li合金中的蠕变反应，机械性能和微观结构演化。当施加的应力低于屈服强度时，蠕变变形具有双初级蠕变的四级行为。对于高应力老化的样品，合金经历了初始保持阶段的不寻常的快速应变，然后表现出正常的两级蠕变行为。应激指数分析表明蠕变机制从扩散蠕变变化到位错升高，应力超过屈服强度。在低应力老化的样品中可以经常观察到δ'/θ'/δ'复合沉淀物（应力取向效果）的表观优先对准，并证明与压力相比，负责降低沉淀强化电位的负责自由老化样品。高应力加载诱导的脱位导致蠕变响应和机械强度的相当大增加。由于位错恢复和在短时间内的溶解簇恢复，不寻常的应变增加归因于由软化（材料强度低于保持应力的材料强度）引起的无弹性变形。位错硬化补偿了通过T_1和δ'/θ'/δ'复合沉淀物在高应力老化样品中的应力取向效果引起的软化。我们的结果揭示了对应力加载和保持阶段的应力水平敏感的微观结构因素确定了Al-Cu-Li合金中的应力水平依赖性蠕变效应。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140381.1-140381.11|共11页
  • 作者

    Peipei Ma; Lihua Zhan; Chunhui Liu; Jianshi Yang; Kailiang Chen; Zhibin Huang;

  • 作者单位

    Light Allay Research Institute of Central South University State Key Laboratory of High-Performance Complex Manufacturing Changsha 410083 China;

    Light Allay Research Institute of Central South University State Key Laboratory of High-Performance Complex Manufacturing Changsha 410083 China School of Mechanical and Electrical Engineering Central South University Changsha 410083 China;

    Light Allay Research Institute of Central South University State Key Laboratory of High-Performance Complex Manufacturing Changsha 410083 China School of Mechanical and Electrical Engineering Central South University Changsha 410083 China;

    School of Mechanical and Electrical Engineering Central South University Changsha 410083 China;

    School of Mechanical and Electrical Engineering Central South University Changsha 410083 China;

    Shanghai Aircraft Manufacturing Co. Ltd Shanghai 201325 China;

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

    Creep age forming; Al-Cu-Li alloys; Precipitation; Microstructure;

    机译：蠕变年龄形成;Al-Cu-Li合金;沉淀;微观结构;

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