Effect of Sc on microstructure and hardness of 6013 aluminum alloy

doi:10.13251/j.issn.0254-6051.2023.08.003

Abstract

Abstract: Effect of Sc addition on microstructure and hardness of 6013 aluminum alloy as-cast, homogenized, and solution treated was studied by means of optical microscope, scanning electron microscope, energy dispersive spectroscopy, and hardness testing. The results show that the addition of 0.4%Sc has a significant refining effect on grain size of 6013 aluminum alloy. After homogenization, a large amount of second phases dissolve into the matrix, and the second phases are more uniformly distributed on the matrix. After adding Sc, it is obvious that the second phase particles on the matrix are reduced, and Al₃Sc is generated and precipitated on the grain boundaries, which plays a role of pinning grain boundaries and refining grains. The addition of 0.4%Sc can inhibit recrystallization, and the hardness of the alloy containing 0.4%Sc after solution treatment is higher than that of the alloy without the addition of Sc.

Key words: 6013 aluminum alloy, Sc, solution treatment, second phase, hardness

CLC Number:

TG146.21

Xiao Xinrui, Sun Tao, Deng Guoyong, Peng Jie, Su Hai, Li Rudong, Zhou Jie, Wang Hebin. Effect of Sc on microstructure and hardness of 6013 aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(8): 16-23.

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