Influence of Pre-tensile Deformation on the Microstructure and Mechanical Properties of 2219 Aluminum Alloy Forgings
FANG Jie1,2, YI Youping1,2,3, HUANG Shiquan2,3, HE Hailin1,2, GUO Wanfu1,2
1 Research Institute of Light Alloy, Central South University, Changsha 410083 2 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083 3 School of Mechanical and Electrical Engineering, Central South University, Changsha 410083
Abstract: Pre-deformation is an effective method to improve the mechanical properties of aging hardened aluminum alloy and its deformation is an important factor to affect mechanical properties. The effects of different pre-tensile deformation amounts (0%, 1%, 3%, 5%, 7%) on the microstructure and mechanical properties of 2219 aluminum alloy ring forgings were investigated by hardness test, scanning electron microscopy (SEM), transmission electron microscopy (TEM) observation and the tensile test at room temperature, to obtain the deformation amount when the mechanical properties of alloy materials were optimized. The results show that pre-tensile deformation can promote the precipitation of aged precipitated phase θ'. With the increase of pre-tensile deformation, the peak aging time is shortened, the hardness and strength increase first and then decrease, and the elongation decreases gradually. When the pre-tensile deformation is 3%, the comprehensive mechanical properties of 2219 aluminum alloy ring forgings are the best, with its tensile strength, yield strength and elongation are 463.5 MPa, 349.5 MPa and 14.31%, respectively.
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2019, Vol. 33 
