Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 870, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2023.144874
Keywords
Additive manufacturing; Aluminium alloy; Zirconium; Microstructure; Direct aging
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The effect of direct aging treatment on the microstructure and strengthening mechanisms of Zr-modified Al-Cu-Mg alloys fabricated by SLM was analyzed in this study. After direct aging treatment, the fine alpha-Al grains were maintained and the S'-Al2CuMg precipitates dissolved. The precipitation of secondary Al3Zr-L12 led to a larger increase in precipitation strengthening compared to grain boundary strengthening.
Zr modification can significantly change the strengthening mechanisms of traditional heat-treatable Al alloys fabricated by selective laser melting (SLM). In this study, the effect of direct aging (DA) treatment on the microstructure and strengthening mechanisms of Zr-modified Al-Cu-Mg alloys fabricated by SLM was analyzed. The fine alpha-Al grains with an average size of approximately 1.1 mu m in the as-fabricated samples were maintained after DA treatment. The S '-Al2CuMg precipitates dissolved, and the secondary Al3Zr-L12, 1.1 nm in radius, precipitated from the alpha-Al matrix after DA treatment. This led to a larger increase of 29 MPa in the contribution of precipitation strengthening compared with the increase of 5 MPa in the contribution of grain boundary strengthening after the DA treatment. In addition, a large number of Cu-Mg-rich and Cu-Mn-rich particles were found in the DA-treated sample, which offered dispersion strengthening. This work provides valuable insights for the development of Zr-modified 2000 series Al alloys applicable in additive manufacturing.
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