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The effect of pre-ageing on the microstructure and properties of 7050 alloy

机译：预时效对7050合金组织和性能的影响

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摘要

In the present work, the effect of pre-ageing temperature and time variations on the mechanical properties and electrical conductivity of the Retrogression and re-aging (RRA) treated 7050 has been investigated. The results reveal that the electronic conductivity and hardness of RRA-treated samples are sensitive to the pre-ageing tempers. The RRA-treated samples with 120 ℃/2 h pre-ageing +180 ℃/2 h retrogression +120 ℃/24 h re-ageing temper can be tailored toward a good combination of strength and elongation, while the electrical conductivity of re-ageing samples is also higher than that of 120 ℃/24 h pre-ageing RRA-treated samples. With an intermediate pre-ageing temperature of 80 ℃/24 h RRA-treated samples possess a higher re-aged electronic conductivity, while no significant differences can be found between hardness of 120 ℃/2 h and 120 ℃/24 h pre-ageing RRA-treated samples. The variation of hardness and electronic conductivity during retrogression depends on the pre-ageing tempers. For under-aged sample, the retrogression hardness appears a stage of hardness increasing followed by a further decrease in hardness results, owing to disappearance of dissolving stage of fine GP zone and η' phase during pre-ageing.
机译：在本工作中，已经研究了预时效温度和时间变化对回归和时效（RRA）处理的7050的机械性能和电导率的影响。结果表明，经RRA处理的样品的电子电导率和硬度对预时效状态敏感。经过RRA处理的样品在120℃/ 2 h时效+180℃/ 2 h回归+120℃/ 24 h时效温度下可以适应强度和伸长率的良好组合，而重新电导率老化样品也高于经过RRA处理的120℃/ 24 h时效样品。在80℃/ 24 h的中间时效温度下，经RRA处理的样品具有较高的再时效电导率，而120℃/ 2 h和120℃/ 24 h时效硬度之间没有显着差异经RRA处理的样品。退回过程中硬度和电导率的变化取决于预老化状态。对于老化不足的样品，由于预老化过程中精细GP区和η'相的溶解阶段的消失，回归硬度出现了一个硬度增加的阶段，随后硬度结果进一步下降。

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  • 来源
    《Journal of Materials Research》 |2015年第24期|3803-3810|共8页
  • 作者

    Yuan Liu; Wenjun Li; Daming Jiang;

  • 作者单位

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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