High-precision Cu alloy microlattices with superior energy absorption capacity enabled by nanoprecipitation engineering

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Shuo Qu
  • Huangliu Fu
  • Xin Zhou
  • Junhao Ding
  • Hui Yang
  • Qi Zhao
  • Xu Song

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number115801
Journal / PublicationScripta Materialia
Volume239
Online published3 Oct 2023
Publication statusPublished - 15 Jan 2024

Abstract

Printing of thin-wall copper alloy components with high mechanical performance using selective laser melting remains challenging. Here, the introduction of the soft Cr nanoprecipitations via increasing the Cr to Nb atomic ratio based on commercial CuCrNb alloys can suppress the excessive formation of Cr2Nb Laves phase and enhance the deformability of CuCrNb microlattices. Small printing layer thickness contributed to the high-density and small-size nanoprecipitations. Dual nanoprecipitations strategy enables us to successfully fabricate high-precision CuCrNb microlattices with the feature size down to 100 µm and exceptional printability, high mechanical strength, and homogeneous deformability until densification strain. By tailoring the precipitation behavior of Cr phase at post-printing stage, CuCrNb microlattices can further enhance the mechanical performance. Our peak-aged Gyroid CuCrNb microlattice displays an ultrahigh specific energy absorption of 23 J/g without fracture at strain above 60 %, even surpassing that of some titanium and aluminum alloys lattice structures with low material densities. © 2023 Acta Materialia Inc. Published by Elsevier Ltd.

Research Area(s)

  • Additive manufacturing, Copper alloy, Microlattices, Nanoprecipitation engineering

Citation Format(s)