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Effect of ageing temperature on precipitation of Al-Cu-Li-Mn-Zr alloy

时效温度对Al-Cu-Li-Mn-Zr 合金析出相的影响

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Abstract

The precipitation behaviors of an Al-Cu-Li-Mn-Zr alloy at different ageing temperatures (120, 160 and 200 °C) were investigated using Vickers hardness measurements and transmission electron microscopy (TEM) characterization. Age hardening curves show an increase in precipitation kinetics with increasing ageing temperature. The results of TEM show that for the samples peak aged at 120 °C, the amount of δ' (Al3Li), GP zones/θ' (Al2Cu) and χ (Al5Cu6Li2) phases is obviously higher than that of T1 (Al2CuLi) precipitates; while the samples peak aged at 160 and 200 °C are usually dominated by T1 phase with a minor fraction of GP zones/θ' and δ', and the χ phase almost does not form. In addition, quantitative analysis on the T1 platelets demonstrates that the samples peak aged at 200 °C have larger plate diameter and smaller area fraction of T1, as compared to the samples peak aged at 160 °C. Correspondingly, the possible reasons for such phenomena are discussed.

摘要

本文采用显微硬度计和透射电子显微镜(TEM)表征手段,研究不同时效温度(120、160、200 °C) 对Al-Cu-Li-Mn-Zr 合金析出行为的影响。通过分析不同时效温度下的时效硬度曲线可以得出,随着 时效温度的升高,析出相的析出速度加快。此外,由TEM 表征结果可知,当时效温度为120 °C 时, 峰值态样品的析出相主要为δ'相(Al3Li)、GP 区/θ'相(Al2Cu)和χ 相(Al5Cu6Li2),其析出量明显高 于T1 相;当时效温度为160 °C 和200 °C 时,样品峰值态的析出相主要为T1 相,并有较少的δ'相和 GP 区/θ'相,而χ 相几乎不存在。对T1 相进行定量统计可知,与时效温度为160 °C 的峰值态样品相比, 时效温度为200 °C 时峰值态样品的主要析出相T1 相的直径更大,且面积分数更小,文本对这些现象 的产生原因进行了阐述和讨论。

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Authors and Affiliations

  1. International Joint Laboratory for Light Alloys of Ministry of Education, College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Yan-jun Deng  (邓燕君), Guang-jie Huang  (黄光杰), Ling-fei Cao  (曹玲飞), Xiao-dong Wu  (吴晓东) & Li Huang  (黄利)

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  1. Yan-jun Deng  (邓燕君)
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  2. Guang-jie Huang  (黄光杰)
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  3. Ling-fei Cao  (曹玲飞)
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  4. Xiao-dong Wu  (吴晓东)
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  5. Li Huang  (黄利)
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Correspondence to Guang-jie Huang  (黄光杰) or Ling-fei Cao  (曹玲飞).

Additional information

Foundation item: Project(2016YFB0300901) supported by the National Key R&D Program of China; Project(51421001) supported by the National Natural Science Foundation of China; Project(2018CDJDCL0019) supported by the Fundamental Research Funds for the Central Universities, China

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Deng, Yj., Huang, Gj., Cao, Lf. et al. Effect of ageing temperature on precipitation of Al-Cu-Li-Mn-Zr alloy. J. Cent. South Univ. 25, 1340–1349 (2018). https://doi.org/10.1007/s11771-018-3830-8

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  • DOI: https://doi.org/10.1007/s11771-018-3830-8

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