Effects of Precipitation of Al₃Zr Particles on Microstructures and Properties of the Al-3.55Cu-1.51Li-0.11Zr Alloy

Abstract:

Under single-step and double-step homogenization conditions, the precipitation behavior of Al₃Zr dispersoids and its effects on the microstructures and tensile properties of an Al-3.5Cu-1.5Li-0.11Zr alloy were investigated in the current study. It was found that a double-stage homogenization (460 °C/16 h, 520 °C/24 h) enhanced the uniformity of the Al₃Zr dispersoids distribution compared with the single-stage homogenized samples. Al₃Zr particles which are coherent with the matrix would inhibit the movement of dislocation induced by stress and also the migration of sub-grain boundary and grain boundary induced by thermal activation. The finer particle size and distribution more diffuse of Al₃Zr particles reduced recrystallization during hot rolling and solution heat treatment, improving the tensile properties of the as-aged sample.

• Periodical: Materials Science Forum (Volume 921)
• Pages: 214-221
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.921.214
• Online since: May 2018
• Authors: Mang Jiang, Jin Jun Xu*
• Keywords: Al-3.55Cu-1.51Li-0.11Zr Alloy, Al₃Zr Precipitate, Microstructure, Property

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