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Precipitation behavior in Al-Zn-Mg-Cu alloy after direct quenching

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Abstract

The precipitation behavior in an Al-6.8Zn-1.9Mg-1.0Cu-0.12Zr alloy after direct quenching from solution heat treatment temperature of 470 °C to 205–355 °C was investigated by means of hardness tests, electrical conductivity tests, and transmission electron microscopy. At temperatures below 265 °C, the hardness increased gradually to a peak value and then decreased rapidly with time. At 265 °C, the hardness was almost unchanged within the initial 2000 s and then decreased gradually. At higher temperatures, the hardness decreased slowly with time. The electrical conductivity started to increase after a certain period of time and then tended to maintain a constant value at all temperatures. Microstructure examination indicated heterogeneous precipitation of the η phase at grain boundaries and inside grains during holding at 205 °C and 325 °C. Based on the electrical conductivity data, the precipitation kinetics could be described quite well by the Johnson-Mehl-Avrami-Komolgorov relationship with a n value varying between 0.78 and 1.33. The activation energy was estimated to be about 44.9 kJ/mol, which is close to that expected for a dislocation diffusion mechanism. Time-temperature-transformation diagrams were constructed and the nose temperature ranged from 295 °C to 325 °C.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Shengdan Liu, Chengbo Li, Yunlai Deng, Xinming Zhang & Qiming Zhong

  2. Ministry of Education, Key laboratory of Non-ferrous Metal Materials, Changsha, 410083, China

    Shengdan Liu, Chengbo Li, Yunlai Deng, Xinming Zhang & Qiming Zhong

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  1. Shengdan Liu
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  2. Chengbo Li
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  3. Yunlai Deng
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  4. Xinming Zhang
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  5. Qiming Zhong
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Correspondence to Shengdan Liu.

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Liu, S., Li, C., Deng, Y. et al. Precipitation behavior in Al-Zn-Mg-Cu alloy after direct quenching. Met. Mater. Int. 20, 195–200 (2014). https://doi.org/10.1007/s12540-014-2001-1

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  • DOI: https://doi.org/10.1007/s12540-014-2001-1

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