Microstructure and mechanical property of 2024/3003 gradient aluminum alloy①
来源期刊：中南大学学报(英文版)2004年第2期
论文作者：张卫文 陈维平 费劲 倪东惠 李元元
文章页码：128 - 133
Key words：2024/3003 alloy; gradient material; microstructure; mechanical property
Abstract: 2024/3003 gradient aluminum alloy was prepared by semi-continuous casting using double-stream-pouring technique. The microstructures of the as-cast, pressed and heat-treated alloys were analyzed by scanning electron micro-scope and transmission electron microscope. And the mechanical properties of the alloy in pressed and heat-treated states were studied. The results show that the ingots with diameter of 65 mm and external thickness about 5.5 mm are obtained when the temperatures of the melt in the internal and external ladles are 1 023 and 1 003 K, respectively, and the nozzle diameter is 2.0 mm. The microstructures of the as-cast alloy consist ofα(Al)+θ(CuAl2)+S(Al2CuMg) in the internal region andα(Al)+MnAl6 in the external region. The phases found in the internal and external layers coexist in the tran-sition zone. The transition layer is maintained after plastic deformation and heat treatment of the alloy. The tensile strength, yield strength and elongation of the alloy are 300 MPa, 132 MPa and 16.0%, respectively, after T6 treat-ment. The tensile and yield strength are increased by 150.0% and 94.1%, respectively, compared with that of 3003 alu-minum alloy. The maximum hardness in the internal region of 2024/3003 gradient aluminum alloy can be increased fromHRF 55 in the pressed state to HRF 70 in the heat-treated state.
