Effects of Deformation Temperature on Microstructure and Mechanical Properties of 2A14 Aluminum Alloy
TONG Dengliang1,2, YI Youping1,2,3, HUANG Shiquan2,3, HE Hailin1,2, GUO Wanfu1,2, WANG Bingxiang2,3
1 Light Alloy Research Institute, Central South University, Changsha 410083, China; 2 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China; 3 School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Abstract: Aiming at the problems of coarse grains and second phase aggregation in the manufacture of large 2A14 aluminium alloy high cylinder parts, a new warm rolling process for high cylinder parts was proposed in this paper. The effects of hot and warm rolling on the microstructure and mechanical properties of 2A14 aluminum alloy were studied by using optical microscope (OM), scanning electronic microscopy (SEM), transmission electron microscopy (TEM) and tensile test. The results show that the comprehensive mechanical properties of 2A14 aluminium alloy can be significantly improved by warm rolling at 200 ℃ combined with heat treatment compared with that of hot rolling at 480 ℃. The tensile strength, yield strength and elongation of 2A14 aluminum alloy can reach 464 MPa, 386 MPa and 9.3%, respectively. A large amount of storage energy accumulated in the form of high density dislocation during warm rolling promotes the nucleation rate of recrystallization during solution process and refines dramaticly grain size. Meanwhile, warm rolling combined with heat treatment can fully break up and dissolve the coarse second-phase compounds in the alloy, improve their non-uniform distribution in the matrix, and promote the precipitation of S′ phase, the main strengthening phase of 2A14 aluminum alloy.
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2020, Vol. 34 
