Selective laser melting additive manufacturing of 7xxx series Al-Zn-Mg-Cu alloy: Cracking elimination by co-incorporation of Si and TiB2

By S. Y. Zhou, Y. Su, H. Wang, J. Enz, T. Ebel, Ming Yan. Additive Manufacturing, 2020

230 citations recorded by the source corpus.

Abstract 7xxx Al alloys such as Al-Zn-Mg-Cu are typical lightweight materials of excellent mechanical performance. Their near-net-shape manufacturing by selective laser melting (SLM) additive manufacturing, however, remains challenging due to hot-cracking prone nature of these alloys, when subjected to rapid solidification during the SLM process. In this study, we propose that co-incorporation of submicron Si and TiB2 to an Al-Zn-Mg-Cu alloy is capable to solve the long-standing problem by reducing solidification shrinkage and, simultaneously, enhancing its fracture toughness. Results show that solidification cracks indeed have been eliminated by the co-incorporation, along with much-refined microstructure. The resultant mechanical properties are high in ultimate tensile (556 ± 12 MPa) and yield strengths (455 ± 4.3 MPa). For disclosing the underlying mechanism, analytical means including high-resolution computer tomography, transmission electron microscopy and electron backscatter diffraction, as well as finite element simulation have been employed. It is aspired that the current approach can enable SLM to process critical engineering materials such as the hard-to-weld Al-Zn-Mg-Cu alloys.

Subfields: Aerospace Engineering, Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/3d6b200b73e7d10d604f0d520e7f53885d418774

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aerospace Engineering

1. Maryam Sadeghilaridjani
2. Mingxing Zhang
3. Leila Ladani
4. H. Hallberg

In Automotive Engineering

1. Maryam Sadeghilaridjani
2. Han Huang
3. Leila Ladani

In Mechanical Engineering

1. Maryam Sadeghilaridjani
2. Leila Ladani
3. Han Huang
4. Mingxing Zhang
5. P. Kelly

Citations in the corpus

• A Novel Strategy to Additively Manufacture 7075 Aluminium Alloy With Selective Laser Melting (2021, background): “It is noteworthy that the mechanical properties of the previously reported SLM-fabricated 7075 alloys relied on the addition of large amounts of nucleants and/or solute elements, which either led to embrittlement or composition deviation from the standard [20-23, 55, 56].”
• Review of Powder Bed Fusion Additive Manufacturing for Metals (2021, background): “Another study worked to prepare crack-free 7xxx Al alloys through co-incorporation of submicron Si and TiB2 into the alloys [290].”