Research on Multiple Plastic Deformations of Ultra-High Strength Aluminium Alloy

Abstract:

Research on multipass plastic deformation of 7A04 ultra-high strength aluminium alloy by isothermal compression experiments on the 6300KN extrusion press. Experiment results show that elongation reaches its maximal value 9.25% after the first deformation. It is obvious that fibrous tissues appeared along the metal flow direction in the deformed 7A04 ultra-high aluminium alloy, with heterogeneous distribution of precipitated η (MgZn2) phase in the matrix, which results in lower strength (Rm=335MPa, Re=212.5MPa). As the times of deformation increases, precipitated phases grow gradually and the plasticity of alloys decreases dramatically, which reaches its minimal value 5.17% after the fourth deformation. With η(MgZn2) phase disperses gradually, the strength of the alloy increases gradually, and reaches its maximal value 386.7MPa after the fourth deformations. It is proved that 7A04 high-strength aluminium alloy has better synthetic mechanical properties after four times deformation.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 1132-1137
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.1132
• Online since: January 2013
• Authors: Ya Cui, Zhi Min Zhang, Jian Min Yu, Qiang Wang
• Keywords: Mechanical Property, Multiple Deformations, Second Phase, Ultra-High Strength Aluminium Alloy

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