Formation mechanism of W(Al8Cu4Sc) phase in Al-Cu-Li-Sc alloy with high Cu content

doi:10.13251/j.issn.0254-6051.2020.02.012

Abstract

Abstract:

The microstructural evolution of an Al-2.35Cu-4.6Li-0.12Sc(at%) alloy with high Cu content and the formation mechanism of W(Al₈Cu₄Sc) phase during homogenization were studied by means of OM、SEM、EPMA、XRD and STEM. The results show that the main solidification phase is T_B (Al₇Cu₄Li) phase in as-cast, and Sc mainly exists in the form of supersaturated solid solution. After homogenization, the T_B phase dissolves completely, the content of Cu in the matrix increases and that of Sc decreases, the stable W phase forms at the same time. The analysis shows that the interface of T_B phase and Al matrix must be a preferred nucleation site for the W phase because of the incoherent interface of T_B phase and Al matrix. So the W phase nucleates preferentially here, and then transforms into the stable phases with a size of 1 μm by consuming the Sc atoms fixed in the supersaturate solid solution and Cu atoms in T_B phase.

Key words: Al-Cu-Li alloy, Sc, W phase, microstructure

CLC Number:

TG146.2

Kong Debin, Li Caiqiong. Formation mechanism of W(Al₈Cu₄Sc) phase in Al-Cu-Li-Sc alloy with high Cu content[J]. HTM, 2020, 45(2): 61-65.

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Formation mechanism of W(Al₈Cu₄Sc) phase in Al-Cu-Li-Sc alloy with high Cu content

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