Local elongation of a high Fe-containing Al-Si-Cu-Mg alloy by a deformation-semisolid extrusion process

Article Materials Science, Multidisciplinary

Precipitation behavior of Al-Si-Cu-Mg(-Fe) alloys by a deformation-semisolid extrusion process

DaeHan Kim et al.

Summary: Al-4.5Si-1Cu-0.3Mg(-1Fe) (wt%) alloys fabricated by a deformation-semisolid extrusion (D-SSE) process were investigated by transmission electron microscopy to atomic level. The age-hardening behavior of the alloys was studied through T5 and T6 heat treatments, revealing the presence of disordered Mg-Si(-Cu) precipitates and Cu-containing atomic clusters in different heat treatment conditions. Despite differences in precipitate density, size, and volume fraction, the hardness in the T6 condition was found to be higher in the alloy with the highest Fe content due to the contribution from precipitates nucleated on fragmented beta-Al5FeSi particles and grain boundaries.

MATERIALS CHARACTERIZATION (2021)

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Article Materials Science, Multidisciplinary

Measurement of Dislocation Density Change during Tensile Deformation in Coarse-Grained Aluminum by In-Situ XRD Technique with Tester Oscillation

Hiroki Adachi et al.

Summary: "In-situ XRD measurements during tensile deformation of a pure aluminum alloy with coarse grains revealed that the dislocation density went through four regions of change, with a significant reduction in dislocation multiplication rate when stress reached 33MPa and dislocation density reached 1.57 x 10(14) m(-2). This is attributed to the low dislocation density required for plastic deformation in coarse-grained aluminum."

MATERIALS TRANSACTIONS (2021)

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Article Nanoscience & Nanotechnology

Enhanced mechanical properties of Al-Si-Cu-Mg(-Fe) alloys by a deformation-semisolid extrusion process

DaeHan Kim et al.

Summary: Al 4.5 wt% Si 1 wt% Cu 0.3 wt% Mg(-1 wt% Fe) alloys fabricated by a deformation-semi-solid extrusion (D-SSE) process were investigated through various analytical methods. The Fe-IMCs and Si particles in the alloy were broken and dispersed during the D-SSE process, leading to localized extension and void coalescence contributing to brittle fracture.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2021)

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Article Materials Science, Multidisciplinary