Effect of aging treatment on phase evolution and mechanical properties of selective laser melted Al-Mg-Er-Zr alloy

Article Materials Science, Multidisciplinary

Effect of heat treatment on the microstructure and mechanical properties of Er-containing Al-7Si-0.6 Mg alloy by laser powder bed fusion

Bo Zhang et al.

Summary: In this study, the Al-7Si-0.6 Mg alloy with added rare earth erbium (Er) was prepared by laser powder bed fusion (LPBF) technology, and the effect of heat treatment on the microstructure and mechanical properties was investigated. The results showed that the addition of Er can hinder the epitaxial growth of the columnar crystal and modify the eutectic Si particles, resulting in an ultrafine eutectic network cellular structure with excellent mechanical properties.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Article Materials Science, Multidisciplinary

Laser-based directed energy deposition of novel Sc/Zr-modified Al-Mg alloys: columnar-to-equiaxed transition and aging hardening behavior

Zihong Wang et al.

Summary: The research focused on achieving columnar-to-equiaxed transition (CET) in Al-based alloys through directed energy deposition (DED) processing with Sc-and-Zr modifications. By introducing primary Al-3(Sc,Zr) nucleation sites, CET was successfully achieved, and the relationship between solidification control parameters and precipitation behavior was established. Increasing Sc/Zr content led to a fully equiaxed grain structure, indicating the effectiveness of the approach in controlling grain morphology in laser additive manufacturing.

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY (2021)

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Article Materials Science, Multidisciplinary

An understanding of duplex microstructures encountered during high strength aluminium alloy laser beam melting processing

Mathieu Opprecht et al.

Summary: This study focuses on the effects of adding Zr or Sc elements in the laser beam melting process of hot cracking prone Al alloys, aiming to promote precipitation reactions and improve grain structure. Experimental results show that adding ZrO2 and Y2O3 particles can increase nucleant site density, affecting the threshold for Al3Zr precipitation.

ACTA MATERIALIA (2021)

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Article Materials Science, Multidisciplinary