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An Al-4Mn-2.4Si-1.5Zr (wt.%) alloy was fabricated by selective laser meltingSelective laser melting (SLM) and its microstructureMicrostructure and creep resistance were investigated. Synchrotron X-ray diffraction (XRD) analyses of the as-printed specimens reveal that α-Al(Mn, Fe)Si phase, crystallizing in a simple cubic lattice (Pm3, a₀ = 12.67 ± 0.02 Å) within the Al(f.c.c.) matrix, is the predominant second phase with a volume fraction of ~ 10%. Transmission electron microscopy (TEM) reveals inter-dendritic clusters of fineFines, globular α-precipitates (<R_> ~10–50 nm) formed during solidificationSolidification, together with a second population of intra-dendritic α-precipitates formed during isothermal aging at 400 °C. Atom-probe tomography (APT) confirms the presence of L1₂-(Al, Si)₃Zr nanoprecipitates and compositional variations distinguishing solidificationSolidification- and aging-induced α-precipitates within the isothermally aged specimen. Compressive creep tests at 300 °C demonstrate high creep resistance, attributed primarily to the fineFines dispersion of α-precipitates, with additional contributions from the L1₂ nanoprecipitates and solid solution strengthening. The results establish α-precipitate-strengthened Al-Mn-Si-based alloys as a promising pathway for developing thermally stable, creep-resistant aluminum alloysAluminum alloy for additive manufacturingAdditive manufacturing.</R_>

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Microstructure and Creep Resistance of an Additively Manufactured Al–Mn–Si Alloy

  • 会议论文

  • 发表日期：

    2026年

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  • Amir R. Farkoosh,
  • David N. Seidman

摘要

An Al-4Mn-2.4Si-1.5Zr (wt.%) alloy was fabricated by selective laser meltingSelective laser melting (SLM) and its microstructureMicrostructure and creep resistance were investigated. Synchrotron X-ray diffraction (XRD) analyses of the as-printed specimens reveal that α-Al(Mn, Fe)Si phase, crystallizing in a simple cubic lattice (Pm3, a₀ = 12.67 ± 0.02 Å) within the Al(f.c.c.) matrix, is the predominant second phase with a volume fraction of ~ 10%. Transmission electron microscopy (TEM) reveals inter-dendritic clusters of fineFines, globular α-precipitates ( ~10–50 nm) formed during solidificationSolidification, together with a second population of intra-dendritic α-precipitates formed during isothermal aging at 400 °C. Atom-probe tomography (APT) confirms the presence of L1₂-(Al, Si)₃Zr nanoprecipitates and compositional variations distinguishing solidificationSolidification- and aging-induced α-precipitates within the isothermally aged specimen. Compressive creep tests at 300 °C demonstrate high creep resistance, attributed primarily to the fineFines dispersion of α-precipitates, with additional contributions from the L1₂ nanoprecipitates and solid solution strengthening. The results establish α-precipitate-strengthened Al-Mn-Si-based alloys as a promising pathway for developing thermally stable, creep-resistant aluminum alloysAluminum alloy for additive manufacturingAdditive manufacturing.