Laser powder bed fusion of high solute Al-Zn-Mg alloys: Processing, characterisation and properties

Materials & Design

S.K. Kairy¹  A. Huang²  N. Birbilis²  A.P. Babu² 

[1] Corresponding author.;Department of Materials Science and Engineering, Monash University, Clayton. VIC 3800, Australia;

关键词: Selective laser melting;    Materials design;    Process optimisation;    Al-Zn-Mg;    TEM;    Quasicrystals;   

DOI  :  

来源: DOAJ

【 摘 要 】

Additive manufacturing of aluminium alloys by laser powder bed fusion (LPBF) has been notionally restricted to a small number of alloy compositions to avoid hot cracking and excessive porosity. In the present work, three unique alloy compositions from the Al-Zn-Mg system with high solute content (Zn > 10 wt% and Mg > 2 wt%) were designed in pursuit of attaining high strength from directly LPBF prepared Al-alloys. The high solute alloys were successfully fabricated, and in-depth microstructural characterisation and phase identification revealed the presence of a new quasicrystalline phase, which was named P-phase. The hardness of the alloys were higher than the existing as-fabricated Al-Zn-Mg alloys and comparable to conventionally fabricated high strength wrought aluminium alloys, however, the as-built tensile properties revealed brittleness. This study presents an insight into the possibilities of fabricating high strength Al-Zn-Mg alloys without expensive additions such as Sc or Zr, through selective laser melting.

【 授权许可】

Unknown