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Low quench sensitivity of superplastic 8090 AI-Li thin sheets

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Abstract

Quench sensitivity of the superplastic 8090 Al-Li thin sheets was investigated from the strengthening point of view for the various precipitates formed in the alloy. Specimens subjected to different cooling rates (water quenching, silicon oil cooling, and air cooling) from solution treatment (or superplastic forming) temperature were examined by tensile tests, transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Experimental results show thatδ′ is the predominant phase in the alloy under all cooling conditions. Becauseδ′ could be formed in a similar amount and size after the T6 treatment, and because the amount ofS′ precipitates andT 2 particles were extremely low, the superplastic 8090 Al-Li alloy would, thus, always exhibit low quench sensitivity. Based on DSC and high resolution electron microscopy (HREM) studies, new interpretations of the first two exotherms of the DSC traces were made. Strong evidence shows that the first exothermic peak is attributed to the further precipitation ofδ′ phase, and the second one is contributed from the Al-Cu-Mg GPB zone formation.

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Authors and Affiliations

  1. Institute of Materials Science and Engineering, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan, Republic of China

    Tsung-Rong Chen (Graduate Student), Guan-Jye Peng (Graduate Student) & J. C. Huang (Professor)

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  1. Tsung-Rong Chen
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  2. Guan-Jye Peng
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  3. J. C. Huang
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Chen, TR., Peng, GJ. & Huang, J.C. Low quench sensitivity of superplastic 8090 AI-Li thin sheets. Metall Mater Trans A 27, 2923–2933 (1996). https://doi.org/10.1007/BF02663842

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