In situ design of ultrafine-grained 7075 Al alloy with laser powder bed fusion

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

2 Scopus Citations
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Author(s)

  • Xi He
  • Yuhe Huang
  • Zhun Huang
  • Tao Wang
  • Xinggang Li
  • Qiang Zhu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number134401
Journal / PublicationMaterials Letters
Volume344
Online published19 Apr 2023
Publication statusPublished - 1 Aug 2023

Abstract

Laser powder bed fusion (L-PBF) is an advanced fast prototyping method for fabricating high-performance metallic components with complex structures. However, the development of L-PBFed high-strength Al alloys is often limited by the hot cracks. To grapple with this difficult issue, a novel solution was proposed by introducing 3 wt% Ti2AlNb intermetallic (IMC) powders into the 7075 Al powders to form an in-situ nucleated 7075 (IN-7075) Al alloy. The results indicated that the as-printed IN-7075 Al alloy was crack-free, and the grain size has been refined from 72.6 μm to 1.5 μm, which was attributed to the in-situ formation of Al3(Ti, Nb) particles and the high grain growth restriction factor (Q) values of Ti and Nb elements in the Al matrix. After a suitable heat treatment, the IN-7075 Al alloy exhibited good mechanical properties with an ultimate tensile strength of 429 ± 2 MPa and an elongation of 9.8 ± 0.5%. © 2023 Elsevier B.V.

Research Area(s)

  • 7075 Al alloy, Additive manufacturing, Grain refinement, Laser powder bed fusion, Metals and alloys, Ti2AlNb intermetallic

Citation Format(s)

In situ design of ultrafine-grained 7075 Al alloy with laser powder bed fusion. / He, Xi; Li, Gan; Huang, Yuhe et al.
In: Materials Letters, Vol. 344, 134401, 01.08.2023.

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