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

doi:10.11896/cldb.19090033

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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 (Er_xMg_1-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.

Key words： Al-5Mg-0.5Mn-0.24Zr-xEr alloy Al₃Er homogenization annealing mechanical properties

Published: 12 September 2020

CLC number:

TG166.3

Fund:This work was financially supported by the Guangxi Innovation Driving Project (GKAA17202011-1), Guangxi Natural Science Foundation (2018GXNSFAA050048, 2017GXNSFAA198271), Guangxi Key Laboratory Project for Processing Non-ferrous Metals and Characteristic Materials (GXYSSF1809).

About author:: Jun Dingenrolled in Guangxi University to pursue his master's degree in September 2017. He has applied 1 national invention patent and participated in 2 Guangxi Natural Science Foundation Projects. His research interests are processing and microstructure & property control in advanced aluminum alloy.
Yanjun Zhaoobtained her Ph.D. degree from the University of Science and Technology Beijing (USTB) in 2011. She was a visiting scholar in Oulu University of Finland in 2014—2015. She is currently an associate professor and master supervisor in Guangxi University. She has published more than 30 journal papers as a first author or corresponding author, authorized 7 national invention patents. She presided over the National Natural Science Foundation, Guangxi Innovation Driving Project and Guangxi Natural Science Foundation. Her research interests focus on the physical simulation, numerical simulation and the microstructure & property control in advanced aluminum alloy and high strength structural steel.

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Cite this article:

DING Jun,ZHAO Yanjun,LI Zhifei, et al. Effects of Er Contents on Microstructure and Mechanical Properties of Al-5Mg-0.5Mn-0.24Zr Alloy Before and After Homogenization Annealing[J]. Materials Reports, 2020, 34(18): 18086-18092.

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http://www.mater-rep.com/EN/10.11896/cldb.19090033 OR http://www.mater-rep.com/EN/Y2020/V34/I18/18086

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