Microstructural evolution of Al-Cu-Mg-Mn-Sc-Zr alloy during homogenization

doi:10.13251/j.issn.0254-6051.2020.04.011

Abstract

Abstract: The microstructure evolution of Al-Cu-Mg-Mn-Sc-Zr alloy was investigated by electron probe microanalysis (EPMA). The results show that there are a large number of the eutectic network-like Al₂Cu phase and Al₆(Mn,Cu) phase in the grain boundary, and there is less formation of the primary Al₃(Sc,Zr) and Al₂CuMg phases. The W (AlCuSc) phase in the alloy can not be detected. Al₂Cu almost all dissolves into the Al matrix after homogenizing at 520 ℃ for 12 h and dissolves completely after 16 h, which is basically consistent with the kinetics analysis result of the homogenization process for 14.1 h. However, the Al₆(Mn,Cu) phase can not dissolve. Furthermore, some coarse and discontinuous arranged W phase particles can form during the homogenization process. So the microstructural evolution during the homogenization is affected by the Sc addition.

Key words: Sc, Zr, homogenization, W phase, kinetics

CLC Number:

TG146.2

Liao Simin, Su Yuchang, Hai Fenglong. Microstructural evolution of Al-Cu-Mg-Mn-Sc-Zr alloy during homogenization[J]. Heat Treatment of Metals, 2020, 45(4): 55-59.

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