Effects of Er Contents on Microstructure and Mechanical Properties of Al-5Mg-0.5Mn-0.24Zr Alloy Before and After Homogenization Annealing
DING Jun1, ZHAO Yanjun1,2,3, LI Zhifei1, PANG Xingzhi1,2, TANG Peng1,2, HU Zhiliu1,2,3
1 The College of Resources, Environment and Materials, Guangxi University, Nanning 530004, China 2 Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning 530004, China 3 Center of Ecological Collaborative Innovation for Aluminum Industry in Guangxi, Nanning 530004, China
Abstract: Based on the main alloy elements of 5083, Er and 0.24wt% Zr were added into Al-5Mg-0.5Mn and double-stage homogenization annealing was carried out at 320℃×20 h＋450℃×20 for the new alloy. The effects of combining adding different Er and 0.24wt% Zr into Al-5Mg-0.5Mn on the structure and mechanical properties and the microstructure evolution of Al3Er were investigated. Also the distribution characteristic of Er was discussed by TEM and surface scan analysis.The results showed that when Er content was 0.42wt% before the homogenized annealing, the maximum microhardness, tensile strength and elongation of the alloys are 77.6HV, 232.8 MPa and 15.3%, respectively. After homo-genization annealing at 320℃×20 h＋450℃×20 h, the microhardness, tensile strength and elongation of the alloys are 86.1HV, 262.4 MPa and 13.3%,respectively. When the Er content increased from 0.068wt% to 0.52wt%, the amount of white composite phases formed and increased with the increase of Er content. Also the size of the white phases increases, and the shape changed from spherical, small and long strips to coarse fish bones. After homogenization annealing at 320℃×20 h+450℃×20 h, the white phases gradually diffused and dissolved, and the coarse fishbone phases disappeared substantially, which transformed into small spherical and small strips. Before homogenization annealing, Er and Mg elements often “segregate together” and Er mainly exists in the form of coarse Al (ErxMg1-x). After homogenization annealing, Al3Er particles of 5—25 nm precipitate and the particles basically conform to the matrix. Also Al3(Er, Zr)particles of 10—30 nm precipitate. They both distribute evenly in the alloy and further improved the strength of the alloy.
丁俊, 赵艳君, 李志飞, 庞兴志, 唐鹏, 胡治流. Er含量对均匀化退火前后Al-5Mg-0.5Mn-0.24Zr合金组织及力学性能的影响[J]. 材料导报, 2020, 34(18): 18086-18092.
DING Jun, ZHAO Yanjun, LI Zhifei, PANG Xingzhi, TANG Peng, HU Zhiliu. Effects of Er Contents on Microstructure and Mechanical Properties of Al-5Mg-0.5Mn-0.24Zr Alloy Before and After Homogenization Annealing. Materials Reports, 2020, 34(18): 18086-18092.
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2020, Vol. 34 
