Effect of Thermo-Mechanical Heat Treatment on Microstructure and Mechanical Property of 2197 Al-Li Alloy

Abstract:

Effects of thermo-mechanical treatment on the mechanical properties and microstructure of 2197 alloy were studied through analyses of the mechanical properties by tensile tests and TEM observation of thermo-mechanical heat treated 2197 alloy plates of various states. Results show that the dominating precipitated phase of peak-aged 2197 alloy during thermo-mechanical heat treatment is T1 phase of which the size is 50~150nm. The precipitation and growth of T1 phase are accelerated due to the existed nucleation sites for heterogeneous nucleation of T1 phase offered by thermo-mechanical treatment, therefore, the time for 2197 alloy to reach the peak-aged state is shorten. The strength of 2197 alloy for peak-aged state is increased through thermo-mechanical treatment because the strengthening effect of T1 phase with higher aspect ratio is bigger than that of δ′ and θ′ phases.

• Periodical: Advanced Materials Research (Volumes 284-286)
• Pages: 1621-1625
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.284-286.1621
• Online since: July 2011
• Authors: Bai Ping Mao, Jun Peng Li, Jian Shen
• Keywords: 2197 Al-li Alloy, Microstructure and Property, T1 Phase, Thermo-Mechanical Heat Treatment

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