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Effects of uniaxial creep ageing on the mechanical properties and micro precipitates of Al-Li-S4 alloy

机译:单轴蠕变时效对Al-Li-S4合金力学性能和微观析出的影响

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摘要

In the present work, effects of creep ageing (CA) on the mechanical properties and micro precipitates of A1-Li-S4 alloy was investigated. Compared with single stress-free ageing (SFA), experimental results show that CA has significantly improved the mechanical properties of Al-Li-S4 alloy, including hardness, strength and elongation. Meanwhile, the peak-ageing time was also prolonged under CA treatment. When specimens were continuously placed under an exterior stress of 240 MPa after CA treatment at 153 ℃ for 25 h, more T_1(Al_2CuLi) nano-precipitates developed and further contributed improvement in mechanical properties. It is mainly attributed to the exterior stress that promoted to form T_1 nano-precipitates. Moreover, CA enabled to restrict both the coarsening of precipitates at grain boundaries and the formation of precipitation free zone. In addition, fractographic examination of SFA-treated and CA-treated Al-Li-S4 tensile specimens were carried out, respectively. Through controlling the formation process of fine T_1 nano-precipitates during CA treatment, it can facilitate the development of novel microstructures in Al-Li-S4 alloys with certain promising mechanical properties.
机译:在本工作中,研究了蠕变时效(CA)对A1-Li-S4合金的力学性能和微沉淀物的影响。与单应力时效(SFA)相比,实验结果表明,CA显着改善了Al-Li-S4合金的力学性能,包括硬度,强度和伸长率。同时,在CA处理下,峰值时效时间也延长了。当在153℃CA处理25 h后将试样连续置于240 MPa的外部应力下时,出现了更多的T_1(Al_2CuLi)纳米沉淀,并进一步改善了机械性能。这主要归因于外部应力,该应力促使形成T_1纳米沉淀。此外,CA既可以限制晶界处沉淀物的粗化,又可以限制无沉淀区的形成。另外,分别对经SFA处理和经CA处理的Al-Li-S4拉伸试样进行了分形检查。通过控制CA处理过程中细小的T_1纳米沉淀的形成过程,可以促进具有一定机械性能的Al-Li-S4合金中新的微观结构的发展。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第14期|272-279|共8页
  • 作者单位

    State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China,College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China,College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China,College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China,College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China;

    State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China,College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China,College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

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

    Al-Li-S4 alloy; Stress-free ageing; Creep aging; Mechanical properties; Micro precipitates;

    机译:Al-Li-S4合金;无压力的老化;蠕变老化;机械性能微沉淀;

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