Novel Al-X alloys with improved hardness

Materials & Design

Colette Fennessy¹  Sanjeev K. Nayak¹  Sonia Tulyani²  Seok-Woo Lee³  Cain J. Hung⁴  Yu Sun⁴  Venkat K. Vedula⁴  Rainer J. Hebert⁵  S. Pamir Alpay⁶ 

[1] Collins Aerospace Center for Advanced Materials, University of Connecticut Technology Park, Storrs, CT 06269, USA;Schlumberger Reservoir Completions Technology Center, Rosharon, TX 77583, USA;Collins Aerospace, One Hamilton Road, Windsor Locks, CT 06096, USA;Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, USA;;Pratt &UTC Additive Manufacturing Center of Excellence, East Hartford, CT 06108, USA;

关键词: Aluminum;    Additive manufacturing;    Alloy development;    Density functional theory;    Solid solution strengthening;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this study, our goal is to design solid solution strengthened aluminum alloys for manufacturing technologies that involve high cooling rates. This investigation starts with an analysis of solid solution strengthening using first principles calculations to determine elastic property changes and local lattice distortions from the introduction of different elements into a host aluminum lattice. These results, coupled with both equilibrium and non-equilibrium solubility data, leads to the selection of cerium and cobalt as the primary candidate alloying elements. Alloys of AlCe and AlCo at concentrations of 0.5, 1.0, and 3.0 at. % are then synthesized and subjected to laser glazing to produce non-equilibrium microstructures. The microstructure and solid solution characteristics are determined using a combination of scanning electron microscopy and transmission electron microscopy. Furthermore, nanoindentation is used to measure the hardness showing that both candidate systems harden significantly after glazing. In addition, Al-1.0Co at. % achieves a hardness comparable to Al6061-T6. These results conclusively show that cerium and cobalt are promising elements in the next generation aluminum alloys which make use of non-equilibrium processing conditions such as additive manufacturing.

【 授权许可】

Unknown